questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
|---|---|---|
What type of numerical figure is important in considering the precision and accuracy of a number?
Here are the choices:
A. component
B. exponent
C. insignificant
D. significant | Next, we identify the least precise measurement: 13.7 kg. This measurement is expressed to the 0.1 decimal place, so our final answer must also be expressed to the 0.1 decimal place. Thus, the answer is rounded to the tenths place, giving us 15.2 kg. Significant Figures in this Text In this text, most numbers are assum... | D: significant. |
What rod provides stiffness to counterbalance the pull of muscles?
Here are the choices:
A. mesoderm
B. notochord
C. spinal cord
D. vertebrae | The notochord lies between the dorsal nerve cord and the digestive tract. It provides stiffness to counterbalance the pull of muscles. | B: notochord. |
What type of cell does the sperm cell fertilize?
Here are the choices:
A. protein
B. bacteria
C. egg
D. fat | Together with random fertilization, more possibilities for genetic variation exist between any two people than the number of individuals alive today. Sexual reproduction is the random fertilization of a gamete from the female using a gamete from the male. In humans, over 8 million (2 23 ) chromosome combinations exist ... | C: egg. |
Where does the most important monsoon in the world occur?
Here are the choices:
A. eastern aisa
B. the atlantic ocean
C. northern africa
D. southern asia | Monsoons are like land and sea breezes, but on a larger scale. They occur because of seasonal changes in the temperature of land and water. In the winter, they blow from land to water. In the summer, they blow from water to land. In regions that experience monsoons, the seawater offshore is extremely warm. The hot air ... | D: southern asia. |
What is the earliest reptile?
Here are the choices:
A. sporozoans
B. staurikosaurus
C. hylonomus
D. pliosaur | Earliest Reptile: Hylonomus. The earliest known reptile is given the genus name Hylonomus. It was about 20 to 30 centimeters (8 to 12 inches) long, lived in swamps, and ate insects and other small invertebrates. | C: hylonomus. |
Which side of the heart does blood from the lungs enter into?
Here are the choices:
A. left atrium
B. right ventricle
C. left ventricle
D. right atrium | Blood from the lungs enters the left atrium of the heart. The left atrium pumps the blood to the left ventricle, which pumps it to the body. This loop is represented by the red arrows in Figure above . | A: left atrium. |
Smog is a visible form of what?
Here are the choices:
A. air pollution
B. oxidation
C. condensation
D. water pollution | Smog clouds the city of Los Angeles, California. Visible air pollution in the form of smog is a sign that the air is unhealthy. | A: air pollution. |
Which therapy uses viruses to genetically modify diseased cells and tissues?
Here are the choices:
A. chemotherapy
B. viral therapy
C. oxygen therapy
D. digestive therapy | In a similar fashion, viral therapy uses viruses to genetically modify diseased cells and tissues. Viral therapy shows promise as a method of gene therapy and in the treatment of cancer. Gene therapy is the insertion of genes into a person’s cells and tissues to treat a disease. In the case of a genetic disease, the de... | B: viral therapy. |
Radiotherapy is effective against cancer because cancer cells reproduce rapidly and, consequently, are more sensitive to this?
Here are the choices:
A. radiation
B. UV light
C. destruction
D. separation | Radiotherapy is effective against cancer because cancer cells reproduce rapidly and, consequently, are more sensitive to radiation. The central problem in radiotherapy is to make the dose for cancer cells as high as possible while limiting the dose for normal cells. The ratio of abnormal cells killed to normal cells ki... | A: radiation. |
What type of cells are multiple small spaces located in the right and left sides of the ethmoid bone?
Here are the choices:
A. amniotic sacs
B. alveoli
C. ethmoid vacuoles
D. ethmoid air cells | Figure 7.18 Paranasal Sinuses The paranasal sinuses are hollow, air-filled spaces named for the skull bone that each occupies. The most anterior is the frontal sinus, located in the frontal bone above the eyebrows. The largest are the maxillary sinuses, located in the right and left maxillary bones below the orbits. Th... | D: ethmoid air cells. |
When what element - whose name means "light bringing" - was first isolated, scientists noted that it glowed in the dark and burned when exposed to air?
Here are the choices:
A. mercury
B. neon
C. oxygen
D. phosphorus | Phosphorus The name phosphorus comes from the Greek words meaning light bringing. When phosphorus was first isolated, scientists noted that it glowed in the dark and burned when exposed to air. Phosphorus is the only member of its group that does not occur in the uncombined state in nature; it exists in many allotropic... | D: phosphorus. |
Digestive enzymes secreted in the acidic environment (low ph) of the stomach help break down what?
Here are the choices:
A. molecules
B. particles
C. proteins
D. cells | Digestive enzymes secreted in the acidic environment (low pH) of the stomach help break down proteins into smaller molecules. The main digestive enzyme in the stomach is pepsin , which works best at a pH of about 1.5. These enzymes would not work optimally at other pHs. Trypsin is another enzyme in the digestive system... | C: proteins. |
The majority of solids are what in nature?
Here are the choices:
A. complex
B. gases
C. liquids
D. crystalline | The majority of solids are crystalline in nature. A crystal is a substance in which the particles are arranged in an orderly, repeating, three-dimensional pattern. Particles of a solid crystal may be ions, atoms, or molecules, depending on the type of substance. The three-dimensional arrangement of a solid crystal is r... | D: crystalline. |
What are the most abundant unicellular algae in the oceans?
Here are the choices:
A. sporozoans
B. chryosophytes
C. staurikosaurus
D. chlorella | 22.11.4 Chryosophytes Chryosophytes are the most abundant unicellular algae in the oceans. They are also one of the biggest components of plankton, a free-floating collection of microorganisms, eggs, and larvae. As photosynthetic organisms, they produce a significant amount of atmospheric oxygen. The reproduction cycle... | B: chryosophytes. |
What term is used to describe the cellular structures responsible for protein synthesis?
Here are the choices:
A. chromosomes
B. nuclei
C. ribosomes
D. chloroplasts | Ribosomes Ribosomes are the cellular structures responsible for protein synthesis. When viewed through an electron microscope, free ribosomes appear as either clusters or single tiny dots floating freely in the cytoplasm. Ribosomes may be attached to either the cytoplasmic side of the plasma membrane or the cytoplasmic... | C: ribosomes. |
What is the sun classified as on the main sequence?
Here are the choices:
A. yellow dwarf
B. gas giant
C. shrinking star
D. red dwarf | Producers create food energy. They are the base of all life on Earth. Most producers use photosynthesis but a very small number use chemosynthesis. | A: yellow dwarf. |
The term science comes from a latin word that means?
Here are the choices:
A. having knowledge
B. having information
C. only knowledge
D. were knowledge | Understanding the "hows" and "whys" of the world is the goal of science. The term science comes from a Latin word that means "having knowledge. " But science is as much about adding to knowledge as it is about having knowledge. Science is a way of thinking as well as a set of facts. Science can be defined as a way of l... | A: having knowledge. |
Lymph vessels, like veins, have what objects that prevent the backflow of fluid?
Here are the choices:
A. valves
B. fibers
C. pores
D. pumps | A: valves. | |
Veins subdivide repeatedly and branch throughout what?
Here are the choices:
A. periosteum
B. epidermis
C. mesophyll
D. stroma | C: mesophyll. | |
What is the term for heat being transferred from molecule to molecule?
Here are the choices:
A. decomposition
B. convection
C. oxidation
D. conduction | In conduction, heat is transferred from molecule to molecule by contact. Warmer molecules vibrate faster than cooler ones. They bump into the cooler molecules. When they do they transfer some of their energy. Conduction happens mainly in the lower atmosphere. Can you explain why?. | D: conduction. |
What is a group of organs that work together to do the same job?
Here are the choices:
A. an organ battery
B. an organ colony
C. an organ system
D. an organ assembly | Organs may be organized into organ systems. An organ system is a group of organs that work together to do the same job. For example, the heart is part of the cardiovascular system. This system also includes blood vessels and blood. The job of the cardiovascular system is to transport substances in blood to and from cel... | C: an organ system. |
What are specialized cells that are capable of sending electrical as well as chemical signals?
Here are the choices:
A. hormones
B. ions
C. enzymes
D. neurons | 16.6 Nervous System The nervous system is made up of neurons and glia. Neurons are specialized cells that are capable of sending electrical as well as chemical signals. Most neurons contain dendrites, which receive these signals, and axons that send signals to other neurons or tissues. Glia are non-neuronal cells in th... | D: neurons. |
What did sir isaac newton's famous law help people understand?
Here are the choices:
A. light
B. motion
C. radio waves
D. gravity | People have known about gravity for thousands of years. After all, they constantly experienced gravity in their daily lives. They knew that things always fall toward the ground. However, it wasn’t until Sir Isaac Newton developed his law of gravity in the late 1600s that people really began to understand gravity. Newto... | D: gravity. |
Compounds containing an atom of what element, bonded in a hydrocarbon framework, are classified as amines?
Here are the choices:
A. hydrogen
B. nitrogen
C. oxygen
D. ammonia | 20.2 Alcohols and Ethers Many organic compounds that are not hydrocarbons can be thought of as derivatives of hydrocarbons. A hydrocarbon derivative can be formed by replacing one or more hydrogen atoms of a hydrocarbon by a functional group, which contains at least one atom of an element other than carbon or hydrogen.... | B: nitrogen. |
What line of latitude is an equal distance from both the north and south poles?
Here are the choices:
A. mid-part
B. divider
C. meridian
D. equator | Lines of latitude circle around Earth. The Equator is a line of latitude right in the middle of the planet. Latitude is divided into degrees: 90° north of the Equator and 90° south of the Equator. One degree is subdivided into 60 minutes. One minute is subdivided into 60 seconds. The Equator is at 0°. The Equator is an... | D: equator. |
What type of graph is useful for showing percents of a whole?
Here are the choices:
A. bar graphs
B. circle graphs
C. gnomic graphs
D. shift graphs | Circle graphs are especially useful for showing percents of a whole. The circle graph in Figure below shows the percent of all vehicles counted that were of each type. | B: circle graphs. |
What substances affect the brain and influence how a person feels, thinks, or acts?
Here are the choices:
A. H2 blockers
B. amphetamines
C. psychoactive drugs or drugs
D. primeval drugs or drugs | Psychoactive drugs affect the brain and influence how a person feels, thinks, or acts. They include medicines and other legal drugs as well as illegal drugs. They may stimulate or depress the central nervous system. Abuse of such drugs may lead to drug addiction, overdose, and death. | C: psychoactive drugs or drugs. |
The reaction rate usually increases as the concentration of what increases?
Here are the choices:
A. mutations
B. generators
C. complexes
D. reactants | Concentration Effects Two substances cannot possibly react with each other unless their constituent particles (molecules, atoms, or ions) come into contact. If there is no contact, the reaction rate will be zero. Conversely, the more reactant particles that collide per unit time, the more often a reaction between them ... | D: reactants. |
Atoms are composed of negatively charged electrons and a positively charged what?
Here are the choices:
A. bond
B. nucleus
C. neutron
D. DNA segment | 30.2 Discovery of the Parts of the Atom: Electrons and Nuclei • Atoms are composed of negatively charged electrons, first proved to exist in cathode-ray-tube experiments, and a positively charged nucleus. • All electrons are identical and have a charge-to-mass ratio of. | B: nucleus. |
Communication is any way that animals share what?
Here are the choices:
A. genes
B. information
C. water
D. food | Communication is any way that animals share information. For animals that live in social groups, communication is essential. Animals may use a range of senses for communicating. The most important way that humans communicate is with language. | B: information. |
What do the muscles of the gastrointestinal tract do?
Here are the choices:
A. stop digestion
B. keep food moving
C. break down food
D. secrete stomach acid | Organs of the GI tract are covered by muscles that contract to keep food moving along. A series of involuntary muscle contractions moves rapidly along the tract, like a wave travelling through a spring toy. The muscle contractions are called peristalsis. The diagram in Figure below shows how peristalsis works. | B: keep food moving. |
What is the fan-like superior region that forms the largest part of the hip bone and is united to the sacrum at the largely immobile sacroiliac joint?
Here are the choices:
A. ilium
B. pica
C. septum
D. spine | The ilium is the fan-like, superior region that forms the largest part of the hip bone. It is firmly united to the sacrum at the largely immobile sacroiliac joint (see Figure 8.12). The ischium forms the posteroinferior region of each hip bone. It supports the body when sitting. The pubis forms the anterior portion of ... | A: ilium. |
What do jellyfish lack in their nervous system?
Here are the choices:
A. Response
B. true brain
C. stimulus
D. Cortex | Nervous systems throughout the animal kingdom vary in structure and complexity, as illustrated by the variety of animals shown in Figure 35.2. Some organisms, like sea sponges, lack a true nervous system. Others, like jellyfish, lack a true brain and instead have a system of separate but connected nerve cells (neurons)... | B: true brain. |
Ingestive protists extend their cell wall and cell membrane around the food item, forming a what?
Here are the choices:
A. food pocket
B. protective bubble
C. food vacuole
D. fuel vacuole | Ingestive protists ingest, or engulf, bacteria and other small particles. They extend their cell wall and cell membrane around the food item, forming a food vacuole . Then enzymes digest the food in the vacuole. | C: food vacuole. |
What type of flowers offer no reward, such as nectar, to a male wasp?
Here are the choices:
A. perennials
B. roses
C. vines
D. ophrys | D: ophrys. | |
If an abnormal cell is not prevented from dividing and it divides uncontrollably, what forms?
Here are the choices:
A. tumor
B. cyst
C. inflammation
D. edema | In panel A, an abnormal cell (2) is prevented from dividing, and the abnormal cell dies (1). In panel B, an abnormal cell is not prevented from dividing. Instead, it divides uncontrollably, leading to the formation of a tumor. | A: tumor. |
Vertebrates have evolved more complex digestive systems, with some species having multi-chambered types of what organ?
Here are the choices:
A. skin
B. stomach
C. respiratory
D. heart | Vertebrate Digestive Systems Vertebrates have evolved more complex digestive systems to adapt to their dietary needs. Some animals have a single stomach, while others have multi-chambered stomachs. Birds have developed a digestive system adapted to eating unmasticated food. Monogastric: Single-chambered Stomach As the ... | B: stomach. |
A trait controlled by a single gene that has two alleles is given what name, after the scientist who studied inheritance?
Here are the choices:
A. rosilin trait
B. carlinian trait
C. darwinian trait
D. mendelian trait | A Mendelian trait is a trait that is controlled by a single gene that has two alleles. One of these alleles is dominant and the other is recessive. Many inheritable conditions in humans are passed to offspring in a simple Mendelian fashion. Medical professionals use Mendel’s laws to predict and understand the inheritan... | D: mendelian trait. |
What law states that energy cannot be created or destroyed?
Here are the choices:
A. difference of energy
B. conservation of force
C. deposit of energy
D. conservation of energy | In any chemical reaction, there is no overall change in the amount of energy. Energy cannot be created or destroyed. This is the law of conservation of energy. | D: conservation of energy. |
How do mammals generate heat?
Here are the choices:
A. eating spicy foods
B. running around fast
C. maintaning low metabolism
D. maintaining high metabolism | Mammals generate heat mainly by maintaining a high rate of metabolism. Compared with the cells of other animals, the cells of mammals have more mitochondria. Mitochondria are the cell organelles that generate energy. Mammals may also produce little bursts of heat by shivering. Shivering occurs when many muscles all con... | D: maintaining high metabolism. |
What are small, icy objects that have very elliptical orbits around the sun?
Here are the choices:
A. asteroids
B. comets
C. meteors
D. craters | Comets are small, icy objects that have very elliptical orbits around the Sun. Their orbits carry them from the outer solar system to the inner solar system, close to the Sun. Early in Earth’s history, comets may have brought water and other substances to Earth during collisions. | B: comets. |
Is the most basic what is the most basic of the sciences, concerning itself with energy, matter, space and time, and their interactions?
Here are the choices:
A. physics
B. genetics
C. biology
D. experiments | Section Summary 1.1 Physics: An Introduction • Science seeks to discover and describe the underlying order and simplicity in nature. • Physics is the most basic of the sciences, concerning itself with energy, matter, space and time, and their interactions. • Scientific laws and theories express the general truths of na... | A: physics. |
Which is the active ingredient of cereal crop disease, ergot?
Here are the choices:
A. byblis acid
B. lysergic acid
C. amino acid
D. pixelation acid | Plant Parasites and Pathogens The production of sufficient good-quality crops is essential to human existence. Plant diseases have ruined crops, bringing widespread famine. Many plant pathogens are fungi that cause tissue decay and eventual death of the host (Figure 24.25). In addition to destroying plant tissue direct... | B: lysergic acid. |
What type of structures evolved to do the same job by unrelated organisms?
Here are the choices:
A. dioxide structures
B. symmetrical structures
C. primal structures
D. analogous structures | Scientists compare the anatomy, embryos, and DNA of living things to understand how they evolved. Evidence for evolution is provided by homologous structures. These are structures shared by related organisms that were inherited from a common ancestor. Other evidence is provided by analogous structures. These are struct... | D: analogous structures. |
What explains the spherical shape of ceres, once thought to be the largest asteroid?
Here are the choices:
A. low gravity
B. space debris
C. orbital plane
D. high gravity | Ceres ( Figure below ) is a rocky body that orbits the Sun. It could be an asteroid or a planet. Before 2006, Ceres was thought to be the largest asteroid. Is it an asteroid? Ceres is in the asteroid belt. But it is by far the largest object in the belt. Ceres has such high gravity that it is spherical. | D: high gravity. |
What measures the height of the largest seismic wave or earth quakes?
Here are the choices:
A. richter scale
B. The EF Scale
C. magnitude scale
D. tremor scale | The intensity of an earthquake can be determined in many ways. The Mercalli Scale identifies the damage done and what people feel, the Richter Scale measures the height of the largest seismic wave, and the moment magnitude scale measures the total energy released by an earthquake. | A: richter scale. |
What type of winds are created when more solar energy strikes the equator than the polar regions?
Here are the choices:
A. arctic winds
B. equatorial winds
C. global winds
D. domestic winds | Winds on Earth are either global or local. Global winds blow in the same directions all the time. They are created when more solar energy strikes the Equator than the polar regions. More about global wind patterns is described in detail in the concept "Global Wind Belts. ". | C: global winds. |
Reptiles and birds are the only known living descendants of what?
Here are the choices:
A. dinosaurs
B. mammals
C. fossils
D. dragons | Crocodilia, containing both alligators and crocodiles, is an order of large reptiles. Reptiles belonging to Crocodilia are the closest living relatives of birds. Reptiles and birds are the only known living descendants of the dinosaurs. Some would day that alligators and crocodiles actually look like small dinosaurs. D... | A: dinosaurs. |
Organism's changing over time is called?
Here are the choices:
A. heterogenicity
B. variation
C. generation
D. evolution | Evolution means change over time. Darwin’s theory of evolution says that organisms change over time ( Figure below ). Evolution is seen in the fossil record. It is seen in the way organisms develop. Evolution is evident in the geographic locations where organism are found. It is evident in the genes of living organisms... | D: evolution. |
The law of conservation mass states that matter cannot be created or what?
Here are the choices:
A. observed
B. moved
C. changed
D. destroyed | The law of conservation of mass states that matter cannot be created or destroyed. | D: destroyed. |
What help should you use for disposing hazardous products?
Here are the choices:
A. biohazard unit
B. call poison control
C. guidelines on label
D. first aid kit | Proper disposal depends on the waste. Many hazardous products have disposal guidelines on the label. That’s one reason why you should keep the products in their original containers. The labels also explain how to use the products safely. Follow the instructions to protect yourself and the environment. Most communities ... | C: guidelines on label. |
Although surface waves are slowest, they do most of the damage of what event?
Here are the choices:
A. tsunami
B. earthquake
C. hurricane
D. volcano | Surface waves are the slowest, but they do the most damage in an earthquake. | B: earthquake. |
Fruit begins to ripen because what gas is released?
Here are the choices:
A. hydrogen
B. chloride
C. sulfur
D. ethylene | D: ethylene. | |
Winter storms develop from what, which form at high altitudes and are associated with hurricanes as well?
Here are the choices:
A. fronts
B. cyclones
C. currents
D. droughts | Like hurricanes, winter storms develop from cyclones. But in the case of winter storms, the cyclones form at higher latitudes. In North America, cyclones often form when the jet stream dips south in the winter. This lets dry polar air pour south. At the same time, warm moist air from the Gulf of Mexico flows north. Whe... | B: cyclones. |
Fungi absorb nutrients from the environment through what?
Here are the choices:
A. spores
B. mycelia
C. hymenium
D. apothecia | Fungal mycelia. Fungi absorb nutrients from the environment through mycelia. The branching mycelia have a high surface-area-to-volume ratio which allows for efficient absorption of nutrients. Some fungi digest nutrients by releasing enzymes into the environment. | B: mycelia. |
What do you call any process in which excess water or wastes are removed from the body?
Here are the choices:
A. depletion
B. digestion
C. excretion
D. diffusion | Excretion is any process in which excess water or wastes are removed from the body. Excretion is the job of the excretory system. Organs of excretion include the large intestine, liver, skin, lungs, and kidneys. | C: excretion. |
Earth's temperature will increase further as more of what colorfully nicknamed gases are put into the atmosphere?
Here are the choices:
A. green dioxide gases
B. greenhouse gases
C. blue dioxide gases
D. bluehouse gases | Current Situation : Currently the heating effect of extra greenhouse gases (since the start of the industrial revolution) is equal to about . Thus the recent period has recorded parallel increases in concentration of carbon dioxide and average global temperature. As more greenhouse gases are put into the atmosphere the... | B: greenhouse gases. |
What happens to cells in a hypertonic solution as water leaves the cell via osmosis?
Here are the choices:
A. shrinkage
B. evaporation
C. self destruction
D. get larger | The movement of water molecules is not itself regulated by cells, so it is important that cells are exposed to an environment in which the concentration of solutes outside of the cells (in the extracellular fluid) is equal to the concentration of solutes inside the cells (in the cytoplasm). Two solutions that have the ... | A: shrinkage. |
Digestion and respiration are both facilitated by the pharynx, more commonly called the what?
Here are the choices:
A. nose
B. esophagus
C. throat
D. sinus | The Pharynx The pharynx (throat) is involved in both digestion and respiration. It receives food and air from the mouth, and air from the nasal cavities. When food enters the pharynx, involuntary muscle contractions close off the air passageways. A short tube of skeletal muscle lined with a mucous membrane, the pharynx... | C: throat. |
What muscle is found only in the walls of the heart?
Here are the choices:
A. skeletal muscle
B. abdominal muscle
C. respiratory muscle
D. cardiac muscle | Cardiac muscle is found only in the walls of the heart. When cardiac muscle contracts, the heart beats and pumps blood. Cardiac muscle contains a great many mitochondria, which produce ATP for energy. This helps the heart resist fatigue. Contractions of cardiac muscle are involuntary like those of smooth muscle. | D: cardiac muscle. |
The wave on a guitar string is transverse. the sound wave rattles a sheet of paper in a direction that shows the sound wave is what?
Here are the choices:
A. lateral
B. obtuse
C. magnetic
D. longitudinal | Figure 16.33 The wave on a guitar string is transverse. The sound wave rattles a sheet of paper in a direction that shows the sound wave is longitudinal. | D: longitudinal. |
How do leaves export sugar to roots and other nonphotosynthetic parts of the plant?
Here are the choices:
A. glands
B. veins
C. chloroplasts
D. stems | B: veins. | |
Some metals, such as gold and platinum, do not corrode easily because they are very resistant to what?
Here are the choices:
A. evaporation
B. heat
C. precipitation
D. oxidation | Some metals, such as gold and platinum, do not corrode easily because they are very resistant to oxidation by common substances. Some other metals begin to be oxidized, but are further protected from additional corrosion by a coating formed on the surface. Aluminum reacts with oxygen to form aluminum oxide, which remai... | D: oxidation. |
What are floods a source of on a floodplain?
Here are the choices:
A. nutrients
B. minerals
C. acids
D. salt | Floods are a source of nutrients on a floodplain. | A: nutrients. |
Which process helps deaminate amino acids?
Here are the choices:
A. caramelization
B. deactivation
C. bromination
D. transamination | The Fate of the Carbon Skeleton Any amino acid can be converted into an intermediate of the citric acid cycle. Once the amino group is removed, usually by transamination, the α-keto acid that remains is catabolized by a pathway unique to that acid and consisting of one or more reactions. For example, phenylalanine unde... | D: transamination. |
What is each half of the cerebrum called?
Here are the choices:
A. demisphere
B. a biplane
C. a describe
D. a hemisphere | The cerebrum is divided into a right and left half ( Figure above ). Each half of the cerebrum is called a hemisphere. The two hemispheres are connected by a thick bundle of axons called the corpus callosum . It lies deep inside the brain and carries messages back and forth between the two hemispheres. | D: a hemisphere. |
During interphase, the cell undergoes normal growth processes while also preparing for what, by accumulating energy and building blocks of dna?
Here are the choices:
A. cell division
B. chromosome division
C. proteins division
D. technology division | The population is an important unit in ecology as well as other biological sciences. How is a population defined, and what are the strengths and weaknesses of this definition? Are there some species that at certain times or places are not in populations?. | A: cell division. |
What type of species have a large effect on the balance of organisms in an ecosystem?
Here are the choices:
A. producers
B. secondary consumers
C. keystone
D. decomposers | Predators play an important role in an ecosystem. For example, if they did not exist, then a single species could become dominant over others. Grazers on a grassland keep grass from growing out of control. Predators can be keystone species . These are species that can have a large effect on the balance of organisms in ... | C: keystone. |
Which type of skeleton supports the animal, protects internal organs, and allows for movement?
Here are the choices:
A. shell
B. external
C. mechanical
D. internal | An internal skeleton. The internal skeleton supports the animal, protects internal organs, and allows for movement. | D: internal. |
After cell division what are the two new cells called?
Here are the choices:
A. daughter cells
B. production cells
C. step cells
D. offspring cells | Cell division is the process in which a cell divides to form two new cells. The original cell is called the parent cell. The two new cells are called daughter cells. All cells contain DNA. DNA is the nucleic acid that stores genetic information. Before a cell divides its DNA must be copied. That way, each daughter cell... | A: daughter cells. |
What are bacteria and archaea examples of?
Here are the choices:
A. eukaryotes
B. prokaryotes
C. fungi
D. plants | Prokaryotes include Bacteria and Archaea. An individual prokaryote consists of a single cell without a nucleus. | B: prokaryotes. |
What gives a coil of copper wire the ability to conduct electricity well?
Here are the choices:
A. optical bonds
B. metallic ions
C. metallic bonds
D. metallic electrons | Image copyright SergiyN, 2014. Coil of copper wire, which conducts electricity well due to metallic bonds . Used under license from Shutterstock. com. | C: metallic bonds. |
Blood helps maintain homeostasis by stabilizing ph, temperature, osmotic pressure, and by eliminating this?
Here are the choices:
A. excess heat
B. toxins
C. acid
D. water | The Role of Blood in the Body Blood, like the human blood illustrated in Figure 40.5 is important for regulation of the body’s systems and homeostasis. Blood helps maintain homeostasis by stabilizing pH, temperature, osmotic pressure, and by eliminating excess heat. Blood supports growth by distributing nutrients and h... | A: excess heat. |
During sexual reproduction, the macronucleus dissolves and is replaced by what?
Here are the choices:
A. micronucleus
B. sporozoans
C. chromosomes
D. fluctuations | Figure 23.16 The complex process of sexual reproduction in Paramecium creates eight daughter cells from two original cells. Each cell has a macronucleus and a micronucleus. During sexual reproduction, the macronucleus dissolves and is replaced by a micronucleus. (credit “micrograph”: modification of work by Ian Sutton;... | A: micronucleus. |
When naming this type of ion the ending of the element’s name is dropped and replaced with the – ide suffix?
Here are the choices:
A. oxides
B. cations
C. amines
D. anions | Naming anions is slightly different than naming cations. The ending of the element’s name is dropped and replaced with the – ide suffix. For example, F - is the fluoride ion, while O 2- is the oxide ion. As is the case with cations, the charge on the anion is indicated by a superscript following the symbol. Common anio... | D: anions. |
What is a random change in an organism's genes?
Here are the choices:
A. infection
B. mutation
C. meiosis
D. accumulation | At some time in the past, a variation probably came from a mutation. A mutation is a random change in an organism's genes ( Figure below ). Mutations are natural. Some are harmful, but many are neutral. If a mutation is harmful, the organism may not live to reproduce. If the mutation is beneficial, that organism may ha... | B: mutation. |
Osseous tissue - the connective tissue that includes specialized cells, mineral salts, and collagen fibers - makes up what?
Here are the choices:
A. bone
B. spine
C. muscles
D. ligaments | 38.2 Bone Bone, or osseous tissue, is connective tissue that includes specialized cells, mineral salts, and collagen fibers. The human skeleton can be divided into long bones, short bones, flat bones, and irregular bones. Compact bone tissue is composed of osteons and forms the external layer of all bones. Spongy bone ... | A: bone. |
What is the name of the hollow nerve cord along the back of chordates?
Here are the choices:
A. phloem
B. zetacord
C. notochord
D. mesoderm | C: notochord. | |
What term is used to describe the amount of space occupied by a sample of matter?
Here are the choices:
A. mass
B. volume
C. growth
D. liquid | Volume is the amount of space occupied by a sample of matter. | B: volume. |
What are responsible for the bending movements of the organelle?
Here are the choices:
A. sporozoans
B. dyneins
C. pores
D. muscles | B: dyneins. | |
What are formed when primary pollutants interact with sunlight, air, or each other?
Here are the choices:
A. secondary contaminants
B. typical pollutants
C. secondary pollutants
D. cross pollutants | Secondary pollutants are formed when primary pollutants interact with sunlight, air, or each other. They do not directly cause pollution. However, when they interact with other parts of the air, they do cause pollution. For example, ozone is created when some pollutants interact with sunlight. High levels of ozone in t... | C: secondary pollutants. |
The first reaction of the body to tissue damage or infection is called the what response?
Here are the choices:
A. defensive
B. inflammatory
C. harmful
D. retaliatory | The cut on your hand may become red, warm, and swollen. These are signs of an inflammatory response. This is the first reaction of the body to tissue damage or infection. As explained in Figure below , the response is triggered by chemicals called cytokines and histamines , which are released when tissue is injured or ... | B: inflammatory. |
Because these components of the endocrine system are transported via blood, they get diluted and are present in low concentrations when they act on their target cells.
Here are the choices:
A. minerals
B. enzymes
C. hormones
D. antibodies | Endocrine Signaling Signals from distant cells are called endocrine signals, and they originate from endocrine cells. (In the body, many endocrine cells are located in endocrine glands, such as the thyroid gland, the hypothalamus, and the pituitary gland. ) These types of signals usually produce a slower response but h... | C: hormones. |
Which theory explains how populations of organisms can change over time?
Here are the choices:
A. free by natural selection
B. evolution by natural selection
C. intelligent selection
D. changes by natural selection | The theory of evolution by natural selection explains how populations of organisms can change over time. As environments change, so must the traits of organisms if they are to survive in the new conditions. Evolution by natural selection explains how this happens. It also explains why there are so many different specie... | B: evolution by natural selection. |
What forms when the dna in the nucleus wraps around proteins?
Here are the choices:
A. genes
B. ribosomes
C. rna
D. chromosomes | To begin mitosis, the DNA in the nucleus wraps around proteins to form chromosomes . Each organism has a unique number of chromosomes. In human cells, our DNA is divided up into 23 pairs of chromosomes. Replicated DNA forms a chromosome made from two identical sister chromatids , forming an "X" shaped molecule ( Figure... | D: chromosomes. |
What is the condition called where pimples form on the skin?
Here are the choices:
A. blushing
B. dermatitis
C. cramping
D. acne | About 85 percent of teens develop acne, like the boy in Figure below . Acne is a condition in which pimples form on the skin. It is caused by a bacterial infection. It happens when the sebaceous glands secrete too much sebum. The excess oil provides a good place for bacteria to grow. Keeping the skin clean helps preven... | D: acne. |
Whose laws of motion are the foundation of dynamics?
Here are the choices:
A. aristotle
B. einstein
C. bell
D. newton | Introduction to Dynamics: Newton’s Laws of Motion Motion draws our attention. Motion itself can be beautiful, causing us to marvel at the forces needed to achieve spectacular motion, such as that of a dolphin jumping out of the water, or a pole vaulter, or the flight of a bird, or the orbit of a satellite. The study of... | D: newton. |
Mutualism is a symbiotic relationship in which both species do what?
Here are the choices:
A. suffer
B. benefit
C. reproduce
D. die | Mutualism is a symbiotic relationship in which both species benefit. An example of mutualism is pictured in Figure below . The clownfish in the photo is hiding among the tentacles of a sea anemone. The tentacles have stingers that can inject poison in the anemone’s prey. The clownfish is protected from the stingers by ... | B: benefit. |
What do you call a substance that cannot be broken down to other substances by chemical reactions.?
Here are the choices:
A. a compound
B. an element
C. a molecule
D. a participate | B: an element. | |
What weather term describes what the temperature feels like when the wind is taken into account?
Here are the choices:
A. humidity
B. freezing point
C. windshield
D. windchill | Blizzards are dangerous storms. The wind may blow the snow into deep drifts. Along with the poor visibility, the snow drifts make driving risky. The wind also makes cold temperatures more dangerous. The greater the wind speed, the higher the windchill. Windchill is what the temperature feels like when the wind is taken... | D: windchill. |
What device uses electromagnetic induction to change the voltage of electric current?
Here are the choices:
A. electric transformer
B. electric conductor
C. convection device
D. electric combustion | An electric generator is a device that changes kinetic energy to electrical energy through electromagnetic induction. An electric transformer is a device that uses electromagnetic induction to change the voltage of electric current. | A: electric transformer. |
What layer of soil usually does not have very small particles like clay?
Here are the choices:
A. topsoil
B. silt
C. sediment
D. undersoil | Topsoil usually does not have very small particles like clay. Clay-sized particles are carried to lower layers as water seeps down into the ground. Many minerals dissolve in the fresh water that moves through the topsoil. These minerals are carried down to the lower layers of soil. | A: topsoil. |
Which type of glaciers form in high mountains and travel through valleys?
Here are the choices:
A. altitude glaciers
B. alpine glaciers
C. seaside glaciers
D. rocky glaciers | Continental glaciers form in a central location with ice moving outward in all directions. Alpine glaciers form in high mountains and travel through valleys. Ice caps cover large areas. | B: alpine glaciers. |
What two types of junctions do animal cells have?
Here are the choices:
A. standard and specialized
B. loose and tight
C. tight and gap
D. gap and solid | C: tight and gap. | |
Where does digestion take place within an incomplete digestive system?
Here are the choices:
A. lumbar region
B. abdomen
C. gastrovascular cavity
D. central nervous system | Flatworms have an incomplete digestive system. This means that the digestive tract has only one opening. Digestion takes place in the gastrovascular cavity. | C: gastrovascular cavity. |
Natural selection cannot create new variations in organisms - these new variations must be created by what, which are usually associated with some sort of abnormality?
Here are the choices:
A. pollution
B. infection
C. mutation
D. radiation | Introduction All life on Earth is related. Evolutionary theory states that humans, beetles, plants, and bacteria all share a common ancestor, but that millions of years of evolution have shaped each of these organisms into the forms seen today. Scientists consider evolution a key concept to understanding life. Natural ... | C: mutation. |
Gene expression is regulated primarily at the what level?
Here are the choices:
A. transcriptional
B. binding
C. translational
D. manufacturing | Gene expression is regulated primarily at the transcriptional level. | A: transcriptional. |
What nullified the idea that all biological catalysts are proteins?
Here are the choices:
A. discovery of metabolites
B. amino acid theory
C. discovery of enzymes
D. discovery of ribozymes | D: discovery of ribozymes. | |
A tadpole turns into what land mammal?
Here are the choices:
A. A tortoise.
B. a frog
C. a morph
D. a pod | B: a frog. | |
In physics, what do you call devices that make work easier?
Here are the choices:
A. machines
B. tools
C. levers
D. circuits | In this chapter, you saw how pressure and buoyancy of fluids can be used to make work easier — from raising a car on a lift to floating a ship on the ocean. Devices that make work easier are called machines in physics. | A: machines. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.