questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
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What is the clear, protective covering on the outside of the eye?
Here are the choices:
A. iris
B. cornea
C. vitreous fluid
D. retina | First, light passes through the cornea of the eye. The cornea is a clear, protective covering on the outside of the eye. | B: cornea. |
Deeper layers of rock must be older than layers closer to the surface, this is the law of what?
Here are the choices:
A. diffraction
B. flux
C. erosion
D. superposition | Superposition refers to the position of rock layers and their relative ages ( Figure below ). Relative age means age in comparison with other rocks, either younger or older. The relative ages of rocks are important for understanding Earth’s history. New rock layers are always deposited on top of existing rock layers. T... | D: superposition. |
Dentists occasionally use metallic mixtures called amalgams for what?
Here are the choices:
A. fillings
B. tools
C. braces
D. anesthesia | Dentists occasionally use metallic mixtures called amalgams for fillings. If an amalgam contains zinc, however, water can contaminate the amalgam as it is being manipulated, producing hydrogen gas under basic conditions. As the filling hardens, the gas can be released, causing pain and cracking the tooth. Write a balan... | A: fillings. |
Which infection turns ant's abdomen red and fruit-like and an easy prey for birds?
Here are the choices:
A. neotropicum
B. trichina
C. yeast
D. cocklebur | neotropicum infects the ant Cephalotes atratus, leading to dramatic changes in the infected ant's morphology and behavior. The infected ant’s abdomen turns red and is held raised up, which makes it resemble a fruit and increases the likelihood of the infected ant being eaten by birds (→). The birds transport the worms,... | A: neotropicum. |
What do mitochondrions have an inner and outer version of?
Here are the choices:
A. Fatty Acids
B. membrane
C. protein
D. Molecule | As you can see from Figure above , a mitochondrion has an inner and outer membrane. The space between the inner and outer membrane is called the intermembrane space. The space enclosed by the inner membrane is called the matrix. The second stage of cellular respiration, the Krebs cycle, takes place in the matrix. The t... | B: membrane. |
Resistance to pesticides in a population of insects is an example of what?
Here are the choices:
A. macroevolution
B. microevolution
C. redistributions
D. extinction | Pesticides were designed to kill bothersome insects. However, sometimes these pesticides will stop working. A pesticide that has worked in the past may no longer kill a particular type of insect. This is due to the development of resistance in the population of insects. The development of resistance to pesticides is on... | B: microevolution. |
What expresses the mass of substance in terms of the volume occupied by the substance?
Here are the choices:
A. velocity
B. diameter
C. frequency
D. density | Density is an expression of the mass of substance in terms of the volume occupied by the substance. | D: density. |
What organ is the hypothalamus a part of?
Here are the choices:
A. Nervous system
B. brain
C. liver
D. heart | The hypothalamus is actually part of the brain (see Figure below ), but it also secretes hormones. Some of its hormones that “tell” the pituitary gland to either secrete or stop secreting its hormones. In this way, the hypothalamus provides a link between the nervous and endocrine systems. The hypothalamus also produce... | B: brain. |
Urea, ammonia and uric acid are types of what waste, excreted in different forms by different species?
Here are the choices:
A. fecal waste
B. carbon waste
C. methane waste
D. nitrogenous waste | Figure 41.13 Nitrogenous waste is excreted in different forms by different species. These include (a) ammonia, (b) urea, and (c) uric acid. (credit a: modification of work by Eric Engbretson, USFWS; credit b: modification of work by B. "Moose" Peterson, USFWS; credit c: modification of work by Dave Menke, USFWS). | D: nitrogenous waste. |
Besides tasting food, what organ is necessary for mastication, deglutition (swallowing), and speech?
Here are the choices:
A. larnyx
B. tongue
C. mouth
D. throat | Muscles That Move the Tongue Although the tongue is obviously important for tasting food, it is also necessary for mastication, deglutition (swallowing), and speech (Figure 11.11 and Figure 11.12). Because it is so moveable, the tongue facilitates complex speech patterns and sounds. | B: tongue. |
What is transmitted by moving electrons in an electric current?
Here are the choices:
A. electrical energy
B. stellar energy
C. subsequent energy
D. potential energy | Electrical energy is transmitted by moving electrons in an electric current. In order to travel, electric current needs matter. It cannot pass through empty space. However, matter resists the flow of electric current. That’s because flowing electrons in current collide with particles of matter, which absorb their energ... | A: electrical energy. |
What happens if a molecule forms strong bonds to the catalyst?
Here are the choices:
A. catalyst gets poisoned
B. molecules gets poisoned
C. membrane gets poisoned
D. surface gets poisoned | In catalysis, if a molecule forms strong bonds to the catalyst, then the catalyst may become poisoned. Experiments on various catalysts showed the following results: a. Fe, Ru, and Os form weak bonds with N2; however, O2, alkynes, alkenes, CO, H2, and CO2 interact more strongly. CO2 and H2 form weak bonds with a Co or ... | A: catalyst gets poisoned. |
In general, kinetic energy is the form of energy powering any type of matter in motion, while the energy of position is called what?
Here are the choices:
A. thermal energy
B. mechanical energy
C. magnetic energy
D. potential energy | The Role of Energy in Chemical Reactions Chemical reactions require a sufficient amount of energy to cause the matter to collide with enough precision and force that old chemical bonds can be broken and new ones formed. In general, kinetic energy is the form of energy powering any type of matter in motion. Imagine you ... | D: potential energy. |
What event occurs between the two solstices?
Here are the choices:
A. summer
B. equinox
C. Christmas
D. Leap Year | Equinox comes halfway between the two solstices. At equinoxes, the Sun's rays shine most directly at the Equator ( Figure below ). The daylight and nighttime hours are exactly equal on an equinox. The autumnal, or fall, equinox happens on September 22 or 23. The vernal, or spring, equinox happens March 21 or 22 in the ... | B: equinox. |
Alveoli can be found in which organ in the human body?
Here are the choices:
A. Liver
B. lungs
C. Heart
D. Stomach | Respiratory tree: terminates in alveolus, alveoli. Respiratory bronchioles branch into alveolar ducts and into alveoli. Alveolus: microscopic air sacs, 300 million of these in human lungs. Total surface area large. Gas diffuses micrometer, very tiny distance. Nervous System Composed of tissues designed to integrate sen... | B: lungs. |
About one-fourth of the blood pumped with each heartbeat enters arteries serving what organs of digestion?
Here are the choices:
A. intestines
B. bowels
C. lungs
D. stomach | Blood Supply The blood vessels serving the digestive system have two functions. They transport the protein and carbohydrate nutrients absorbed by mucosal cells after food is digested in the lumen. Lipids are absorbed via lacteals, tiny structures of the lymphatic system. The blood vessels’ second function is to supply ... | A: intestines. |
The paired bones of the skull are the palatine, zygomatic, nasal, lacrimal, inferior nasal conchae bones, and what else?
Here are the choices:
A. elongated
B. minilla
C. ventral
D. maxilla | Facial Bones of the Skull The facial bones of the skull form the upper and lower jaws, the nose, nasal cavity and nasal septum, and the orbit. The facial bones include 14 bones, with six paired bones and two unpaired bones. The paired bones are the maxilla, palatine, zygomatic, nasal, lacrimal, and inferior nasal conch... | D: maxilla. |
Each muscle fiber contains hundreds of organelles called what?
Here are the choices:
A. myofibrils
B. pores
C. slow twitch fibres
D. fast glycolytic fibres | Each muscle fiber contains hundreds of organelles called myofibrils. Each myofibril is made up of two types of protein filaments: actin filaments, which are thinner, and myosin filaments, which are thicker. Actin filaments are anchored to structures called Z lines (see Figure below ). The region between two Z lines is ... | A: myofibrils. |
The common cold and flu are examples of human diseases caused by what tiny particles?
Here are the choices:
A. parasites
B. viruses
C. infections
D. bacteria | Viruses , like the one depicted in Figure below , are tiny particles that may cause disease. Human diseases caused by viruses include the common cold and flu. Do you think viruses are prokaryotes or eukaryotes? The answer may surprise you. Viruses are not cells at all, so they are neither prokaryotes nor eukaryotes. | B: viruses. |
What are the two layers of the skin?
Here are the choices:
A. epithelial and endometrial
B. dermis and epithelial
C. sebaceous and salivary
D. epidermis and dermis | Skin is made up of two layers, the epidermis and the dermis. | D: epidermis and dermis. |
Light can be used to eject what from a solid material?
Here are the choices:
A. protons
B. electrons
C. calories
D. neutrons | Under the right conditions, light can be used to eject electrons from a solid material. | B: electrons. |
What element is a biochemical compound based on?
Here are the choices:
A. hydrogen
B. carbon
C. oxygen
D. nitrogen | Besides water, most of the compounds in living things are biochemical compounds. A biochemical compound is a carbon-based compound that is found in living organisms. Carbon is an element that has a tremendous ability to form large compounds. Each atom of carbon can form four chemical bonds with other atoms. A chemical ... | B: carbon. |
The amniotic sac is attached to what?
Here are the choices:
A. Umbilical Cord
B. Stomach
C. uterus
D. placenta | Attached to the placenta is the amniotic sac , an enclosed membrane that surrounds and protects the fetus (see Figure above ). It contains amniotic fluid, which consists of water and dissolved substances. The fluid allows the fetus to move freely until it grows to fill most of the available space. The fluid also cushio... | D: placenta. |
Which type of respiration helps organisms generate quick bursts of speed, as opposed to long steady movement?
Here are the choices:
A. anabolic respiration
B. insertion respiration
C. anaerobic respiration
D. digestion respiration | Each type of muscle fiber has advantages and disadvantages, which reflect their differing biochemical pathways. Aerobic respiration in red muscles full of mitochondria, produces a great deal of ATP from far less glucose - but slowly, over a long time. Anaerobic respiration in white muscle cells full of carbohydrates, p... | C: anaerobic respiration. |
When matter reacts, there can be what that comes from nowhere and is unaccounted for?
Here are the choices:
A. bonds
B. mass
C. concentrations
D. combustions | When matter reacts, there can be mass that comes from nowhere and is unaccounted for. | B: mass. |
What is located at about 80 degrees north latitude?
Here are the choices:
A. alaska
B. the north pole
C. the equator
D. india | A: Earth has north and south magnetic poles. The North Pole is located at about 80 degrees north latitude. The magnetic field is an area around Earth that is affected by its magnetic field. The field is strongest at the poles, and lines of magnetic force move from the north to the south magnetic pole. | B: the north pole. |
What is a byproduct from the combustion of fossil fuels like coal and gasoline?
Here are the choices:
A. nitrogen dioxide
B. alcohol
C. aluminum oxide
D. carbon monoxide | The brown color is from nitrogen dioxide gas. Nitrogen dioxide is a byproduct from the combustion of fossil fuels like coal and gasoline. | A: nitrogen dioxide. |
What can damage animal tissues?
Here are the choices:
A. wind erosion
B. extreme pressure or temperature
C. nervous stress
D. acid and water exposure | B: extreme pressure or temperature. | |
Along with other functions, what do carbohydrates, proteins, and lipids provide for the body?
Here are the choices:
A. energy
B. hydrogen
C. carbon
D. muscle | Carbohydrates, proteins, and lipids provide energy and have other important roles in the body. | A: energy. |
What system of the body uses amylase and pepsin in its functioning?
Here are the choices:
A. respiratory system
B. hormonal system
C. digestive system
D. circulatory system | Top: Flickr:LearningLark; Bottom: Laura Guerin (CK-12 Foundation). Amylase and pepsin are used in our digestive system . Top: CC BY 2.0; Bottom: CC BY-NC 3.0. | C: digestive system. |
What are genes located on the sex chromosomes called?
Here are the choices:
A. sex-linked genes
B. dimorphism - linked genes
C. diploid genes
D. autosomes | Genes located on the sex chromosomes are called sex-linked genes . Most sex-linked genes are on the X chromosome, because the Y chromosome has relatively few genes. Strictly speaking, genes on the X chromosome are X-linked genes , but the term sex-linked is often used to refer to them. | A: sex-linked genes. |
The posterior pituitary releases which hormone, which stimulates uterine contractions during childbirth?
Here are the choices:
A. estradiol
B. insulin
C. estrogen
D. oxytocin | In addition to producing FSH and LH, the anterior portion of the pituitary gland also produces the hormone prolactin (PRL) in females. Prolactin stimulates the production of milk by the mammary glands following childbirth. Prolactin levels are regulated by the hypothalamic hormones prolactin-releasing hormone (PRH) and... | D: oxytocin. |
What consists mainly of parenchymal cells with chloroplasts?
Here are the choices:
A. mesophyll
B. periosteum
C. chlorophyll
D. mitochondria | Mesophyll makes up most of the leaf’s interior. This is where photosynthesis occurs. Mesophyll consists mainly of parenchymal cells with chloroplasts. | A: mesophyll. |
What is the movement of animals from one place to another?
Here are the choices:
A. trade
B. communication
C. migration
D. population | Another example of a behavior with a yearly cycle is migration . Migration is the movement of animals from one place to another. Migration is an innate behavior that is triggered by changes in the environment. For example, animals may migrate when the days get shorter in the fall. Migration is most common in birds, fis... | C: migration. |
Twin studies have been instrumental in demonstrating what type of component in autism?
Here are the choices:
A. internal
B. environmental
C. bacterial
D. natural | Autism has a wide phenotypic spectrum of disability. Twin studies have been instrumental in demonstrating an environmental component in autism. | B: environmental. |
What is a measure of the size of sound waves?
Here are the choices:
A. amplitude
B. wavelength
C. voltage
D. frequency | Amplitude is a measure of the size of sound waves. It depends on the amount of energy that started the waves. Greater amplitude waves have more energy and greater intensity, so they sound louder. For a video demonstration of the amplitude and loudness of sounds, go to this URL: http://www. youtube. com/watch?v=irqfGYD2... | A: amplitude. |
Covalent compounds form individual molecules rather than what?
Here are the choices:
A. crystals
B. carbon
C. chemicals
D. atoms | Covalent compounds form individual molecules rather than crystals. Compared with ionic compounds, they have low melting and boiling points. They are also poor conductors of electricity. In polar covalent compounds, oppositely charged ends of different molecules attract each other. This affects the properties of polar c... | A: crystals. |
Winds are caused by differences in what?
Here are the choices:
A. elevation
B. temperature
C. water pressure
D. air pressure | D: air pressure. | |
What is generated when a heart ventricle contracts?
Here are the choices:
A. artery pressure
B. blood force
C. blood pressure
D. vein pressure | C: blood pressure. | |
What area beneath the earth's surface do magma collects?
Here are the choices:
A. magma chambers
B. erosion chambers
C. underneath chambers
D. hot chambers | Magma collects in magma chambers beneath Earth’s surface. Magma chambers are located where the heat and pressure are great enough to melt rock. These locations are at divergent or convergent plate boundaries or at hotpots. | A: magma chambers. |
What develop inside chambers called ovaries, which originate within flowers and mature into fruits?
Here are the choices:
A. angiosperm seeds
B. tomoxia seeds
C. pollen seeds
D. trematode seeds | A: angiosperm seeds. | |
What kind of lakes form when volcanic eruptions create holes that fill with water?
Here are the choices:
A. artificial lakes
B. novel lakes
C. crater lakes
D. formation lakes | Other lakes are crater lakes or rift lakes ( Figure below ). Crater lakes form when volcanic eruptions create craters that fill with water. Rift lakes form when movements of tectonic plates create low places that fill with water. | C: crater lakes. |
The size of the solute particles determines the rate of what?
Here are the choices:
A. extracting
B. solution
C. merging
D. dissolving | The rate at which a solute dissolves depends upon the size of the solute particles. Dissolving is a surface phenomenon since it depends on solvent molecules colliding with the outer surface of the solute. A given quantity of solute dissolves faster when it is ground into small particles than if it is in the form of a l... | D: dissolving. |
The vas deferens and ejaculatory ducts are part of what system?
Here are the choices:
A. female adaptive system
B. male reproductive system
C. female reproductive system
D. male circulatory system | In addition to these organs, the male reproductive system consists of a series of ducts and glands. Ducts include the vas deferens and ejaculatory ducts. They transport sperm from the epididymis to the urethra in the penis. Glands include the seminal vesicles and prostate gland . They secrete substances that become par... | B: male reproductive system. |
What part of an egg contains the genetic material ?
Here are the choices:
A. the sperm
B. here.the nucleus
C. the nucleus
D. the fetus | The ostrich egg - unfertilized, of course. Yes, this egg, just like a human ovum, is just one cell. The egg shell membrane encloses the nucleus containing the genetic material and the cytoplasm. | C: the nucleus. |
Bees and other wild animals perform what function on flowering plants, making them vital for crop reproduction?
Here are the choices:
A. pollenation
B. pesticide
C. irrigation
D. fertilizer | Animals, like the bee in Figure below , pollinate flowering plants. Many crop plants depend on pollination by wild animals. | A: pollenation. |
What does the sebaceous gland secrete which waterproofs the skin and hair?
Here are the choices:
A. progesterone
B. collagen
C. sebum
D. pus | Hair, hair follicle, and oil glands. The oil, called sebum, helps to prevent water loss from the skin. The sebaceous gland secretes sebum, which waterproofs the skin and hair. | C: sebum. |
What water is about 3.5% salt?
Here are the choices:
A. seawater
B. spring water
C. glacial water
D. fresh water | You know that ocean water is salty. How salty is it? What is the salinity of seawater? Average seawater is about 3.5% salt. The amount is different if there is a nearby source of freshwater. It is also different if there is a lot of evaporation in an area. How do you think these things affect seawater salinity? Seawate... | A: seawater. |
Catabolic and anabolic hormones in the body help regulate these?
Here are the choices:
A. metabolic processes
B. nutrient levels
C. brain signals
D. hormone levels | Hormonal Regulation of Metabolism Catabolic and anabolic hormones in the body help regulate metabolic processes. Catabolic hormones stimulate the breakdown of molecules and the production of energy. These include cortisol, glucagon, adrenaline/epinephrine, and cytokines. All of these hormones are mobilized at specific ... | A: metabolic processes. |
Food chains and what describe the transfer of energy within an ecosystem, from one organism to another?
Here are the choices:
A. food webs
B. fuel webs
C. the webs
D. spider webs | Describing the flow of energy within an ecosystem essentially answers this question. To survive, one must eat. Why? To get energy. Food chains and webs describe the transfer of energy within an ecosystem, from one organism to another. In other words, they show who eats whom. | A: food webs. |
The type of eruption a volcano has depends on the type of what in its chamber?
Here are the choices:
A. magma
B. core
C. funnel
D. cavity | The type of eruption a volcano has depends on the type of magma in its chamber. Some eruptions are explosive. Some eruptions are quiet. All eruptions are amazing!. | A: magma. |
What organ has four ventricles, all of which developed from the original hollow space within the neural tube?
Here are the choices:
A. liver
B. brain
C. bladder
D. heart | The Ventricles There are four ventricles within the brain, all of which developed from the original hollow space within the neural tube, the central canal. The first two are named the lateral ventricles and are deep within the cerebrum. These ventricles are connected to the third ventricle by two openings called the in... | B: brain. |
The cell theory and the theory of evolution by natural selection are basic to all fields in what branch of science?
Here are the choices:
A. life science
B. zoology
C. chemistry
D. rock science | Each field of life science has its own specific body of knowledge and relevant theories. However, two theories are basic to all of the life sciences. They form the foundation of every life science field. They are the cell theory and the theory of evolution by natural selection. Both theories have been tested repeatedly... | A: life science. |
How many types of antigens can an antibody match?
Here are the choices:
A. one
B. four
C. two
D. infinite | An antibody matches only one type of antigen. | A: one. |
What do drugs that alleviate symptoms of schizophrenia block?
Here are the choices:
A. adrenaline receptors
B. dopamine receptors
C. ephedrine receptors
D. histamine receptors | B: dopamine receptors. | |
What destroys the filtered pathogens?
Here are the choices:
A. antibodies
B. lymphocytes
C. neutrophils
D. parasites | Lymphatic vessels make up a body-wide circulatory system. The fluid they circulate is lymph. Lymph is a fluid that leaks out of capillaries into spaces between cells. As the lymph accumulates between cells, it diffuses into tiny lymphatic vessels. The lymph then moves through the lymphatic system from smaller to larger... | B: lymphocytes. |
A device that produces a very focused beam of visible light of just one wavelength and color is called?
Here are the choices:
A. microwave
B. laser
C. mirror
D. prism | A laser is a device that produces a very focused beam of visible light of just one wavelength and color. Pulses of laser light carry communication signals through optical fibers. | B: laser. |
The second step in eukaryotic cell division is division of which part of the cell?
Here are the choices:
A. protons
B. Cell Division
C. nucleus
D. molecules | 2. The second step in eukaryotic cell division is division of the cell’s nucleus. This includes division of the chromosomes. This step is called mitosis. It is a complex process that occurs in four phases. The phases of mitosis are described below. | C: nucleus. |
Approximately how many galaxies are there in the universe?
Here are the choices:
A. about a hundred billion
B. an octillion
C. a trillion
D. an infinite number | The Universe contains about a hundred billion galaxies. | A: about a hundred billion. |
What theory of evolution is charles darwin most known for?
Here are the choices:
A. natural selection
B. immoral selection
C. natural variety
D. natural change | Evolution focuses on past life forms and how they turned into present life forms. The history of life on Earth demonstrates how the first cells formed, turned into simple life forms, and then became more complex plants and animals. The studies of Charles Darwin have reshaped and influenced all aspects of biology. The v... | A: natural selection. |
What organ system is different in men and women?
Here are the choices:
A. reproductive organs
B. lymphatic organs
C. respratory organs
D. nervous organs | Men and women share most of the same organs. We all have skin, a heart, and lungs. Men and women differ only in their reproductive organs. | A: reproductive organs. |
Why do effusive eruptions rarely kill anyone?
Here are the choices:
A. They are low temperature
B. they move slowly
C. They occur rarely
D. They are minor | Effusive eruptions rarely kill anyone because they move slowly. People can usually be evacuated before an effusive eruption. Still, effusive eruptions can be destructive. There is not much anyone can do to stop a lava flow from destroying a building or road ( Figure below ). | B: they move slowly. |
What are hot fragments of rock called?
Here are the choices:
A. shards
B. pyroclasts
C. obsidian
D. magma | Ash and particles shoot many kilometers into the sky. The material may form a mushroom cloud, just like a nuclear explosion. Hot fragments of rock, called pyroclasts , fly up into the air at very high speeds. The pyroclasts cool in the atmosphere. Some ash may stay in the atmosphere for years. The ash may block out sun... | B: pyroclasts. |
Unevenness or asymmetry in the focus of the eye describes what visual defect?
Here are the choices:
A. presbyopia
B. hyperopia
C. astigmatism
D. myopia | Another common vision defect is astigmatism, an unevenness or asymmetry in the focus of the eye. For example, rays passing through a vertical region of the eye may focus closer than rays passing through a horizontal region, resulting in the image appearing elongated. This is mostly due to irregularities in the shape of... | C: astigmatism. |
The addition of electron gives the halide ions the same electron configuration as what gas?
Here are the choices:
A. a flammable gas
B. a fatty gas
C. a noble gas
D. an inert gas | The elements of the halogen group (Group 17) gain electrons most readily, as can be seen from their large negative electron affinities. This means that more energy is released in the formation of a halide ion than for the anions of any other elements. Considering electron configuration, it is easy to see why. The outer... | C: a noble gas. |
Partially decayed remains of plants and animals form the organic portion of what?
Here are the choices:
A. soil
B. minerals
C. grasses
D. nutrients | the partially decayed remains of plants and animals that forms the organic portion of soil. | A: soil. |
Where is the most significant connection between the cerebellum and the rest of the brain?
Here are the choices:
A. at the meninges
B. at the medulla oblongata
C. at the pons
D. at the cerebrum | Secondary Vesicles The brain continues to develop, and the vesicles differentiate further (see Figure 13.3b). The three primary vesicles become five secondary vesicles. The prosencephalon enlarges into two new vesicles called the telencephalon and the diencephalon. The telecephalon will become the cerebrum. The diencep... | C: at the pons. |
What do you call the daily changes in the level of ocean water?
Here are the choices:
A. waves
B. tides
C. shores
D. currents | Tides are daily changes in the level of ocean water. They occur all around the globe. High tides occur when the water reaches its highest level in a day. Low tides occur when the water reaches its lowest level in a day. Tides keep cycling from high to low and back again. In most places the water level rises and falls t... | B: tides. |
What are the specialized building blocks of your body?
Here are the choices:
A. proteins
B. tissues
C. muscles
D. cells | Introduction Close your eyes and picture a brick wall. What is the basic building block of that wall? A single brick, of course. Like a brick wall, your body is composed of basic building blocks, and the building blocks of your body are cells. Your body has many kinds of cells, each specialized for a specific purpose. ... | D: cells. |
What do plants make to store extra glucose?
Here are the choices:
A. starches
B. sugars
C. water
D. fats | Starches are complex carbohydrates. They are polymers of glucose. Starches contain hundreds of glucose monomers. Plants make starches to store extra glucose. Consumers can get starches by eating plants. Common sources of starches in the human diet are pictured Figure below . Our digestive system breaks down starches to... | A: starches. |
Sand dunes migrate when sand is blown up a slope and this force pulls it down the other side?
Here are the choices:
A. gravity
B. earthquakes
C. air pressure
D. spin | Sand is blown up a slope. Gravity pulls it down the other side. This is how dunes migrate. | A: gravity. |
Inside each lymph node is a honeycomb of connective tissue with spaces filled by what?
Here are the choices:
A. hemoglobin
B. white blood cells
C. red blood cells
D. platelets | B: white blood cells. | |
What "apparatus" is responsible for sorting, modifying, and shipping off the products that come from the rough endoplasmic reticulum?
Here are the choices:
A. secretion apparatus
B. golgi apparatus
C. receptor apparatus
D. plasma apparatus | The Golgi Apparatus The Golgi apparatus is responsible for sorting, modifying, and shipping off the products that come from the rough ER, much like a post-office. The Golgi apparatus looks like stacked flattened discs, almost like stacks of oddly shaped pancakes. Like the ER, these discs are membranous. The Golgi appar... | B: golgi apparatus. |
When two haploid gametes unite during fertilization they form what?
Here are the choices:
A. a diploid cell
B. a mutated cell
C. haploid cell
D. a fertilized cell | diploid cell that forms when two haploid gametes unite during fertilization. | A: a diploid cell. |
What kind of phenotype results in a case of incomplete dominance?
Here are the choices:
A. short phenotype
B. intermediate phenotype
C. backward phenotype
D. long phenotype | 1. Define energy, and state where living things get the energy they need. | B: intermediate phenotype. |
Chloroplasts, chromoplasts, and leucoplasts are all plastids, organelles found in what kind of cells?
Here are the choices:
A. plant cells
B. heart cells
C. lung cells
D. animal cells | Plastids are organelles in plant cells that may have various jobs. The main types of plastids are chloroplasts, chromoplasts, and leucoplasts. | A: plant cells. |
What is the attraction of a particular atom for the electrons of a covalent bond called?
Here are the choices:
A. electronegativity
B. ionization
C. electromagnetism
D. conductivity | A: electronegativity. | |
How many continents do birds breed on?
Here are the choices:
A. 2
B. 4
C. 7
D. 3 | Birds live and breed in most terrestrial habitats on all seven continents. They occupy a wide range of ecological positions. | C: 7. |
Dna consists of how many long chains of nucleotides?
Here are the choices:
A. three
B. one
C. zero
D. two | DNA consists of two long chains of nucleotides. Nitrogen bases on the two chains form hydrogen bonds with each other. Adenine always bonds with thymine, and guanine always bonds with cytosine. These bonds hold the two chains together and give DNA is characteristic double helix, or spiral, shape. You can see the shape o... | D: two. |
What is the transition from liquid to gas is called?
Here are the choices:
A. boiling
B. melting
C. condensing
D. freezing | The liquid to gas transition is called boiling. | A: boiling. |
What is inside the plasma membrane of a prokaryotic cell?
Here are the choices:
A. cytoplasm
B. protoplasm
C. electron
D. alkaline | Inside the plasma membrane of prokaryotic cells is the cytoplasm. It contains several structures, including ribosomes, a cytoskeleton, and genetic material. Ribosomes are sites where proteins are made. The cytoskeleton helps the cell keeps its shape. The genetic material is usually a single loop of DNA. There may also ... | A: cytoplasm. |
When the helium is gone, the stars become what?
Here are the choices:
A. white dwarfs
B. red giants
C. yellow dwarfs
D. comets | When the helium is gone, the stars become white dwarfs. | A: white dwarfs. |
What is the change of state from a solid to a gas without passing through the liquid state?
Here are the choices:
A. vaporization
B. sublimation
C. speciation
D. neutralization | Sublimation is the change of state from a solid to a gas without passing through the liquid state. | B: sublimation. |
What type of cells are gametes?
Here are the choices:
A. cardiac
B. reproductive
C. immune
D. proteins | Sperm are male gametes, or reproductive cells. Sperm form when certain cells in the male reproductive system divide by meiosis to form haploid cells. Being haploid means they have half the number of chromosomes of other cells in the body. An adult male may produce millions of sperm each day!. | B: reproductive. |
What is the touch response in plants called?
Here are the choices:
A. pollenation
B. sensitivity
C. phototropism
D. thigmotropism | The surface temperature of most stars is due to their size. Bigger stars produce more energy, so their surfaces are hotter. But some very small stars are very hot. Some very big stars are cool. | D: thigmotropism. |
Humans have an estimated 20,000 to 22,000 of what units of heredity?
Here are the choices:
A. genes
B. chromosomes
C. eggs
D. cells | Humans have an estimated 20,000 to 22,000 genes. This may sound like a lot, but it really isn’t. Far simpler species have almost as many genes as humans. However, human cells use splicing and other processes to make multiple proteins from the instructions encoded in a single gene. Of the 3 billion base pairs in the hum... | A: genes. |
What is defined as the amount of force acting on a given area?
Here are the choices:
A. pressure
B. resistance
C. energy
D. power | Pressure is defined as the amount of force acting on a given area. Therefore, pressure can be represented by this equation:. | A: pressure. |
What system consists of glands that secrete hormones into the bloodstream?
Here are the choices:
A. nervous system
B. Respiratory system
C. Muscular system
D. the endocrine system | The endocrine system consists of glands that secrete hormones into the bloodstream. | D: the endocrine system. |
Where are the oceans most polluted?
Here are the choices:
A. on the ocean floor
B. along coasts
C. along reefs
D. in warmer waters | The oceans are most polluted along coasts. Why do you think that's the case? Of course, it's because most pollution enters the oceans from the land. Runoff and rivers carry the majority of pollution into the ocean. Many cities dump their wastewater , water mixed with waste, directly into coastal waters. In some parts o... | B: along coasts. |
What organelles are known as the energy "powerhouses" of the cells?
Here are the choices:
A. mitochondria
B. carbohydrates
C. atoms
D. proteins | In stage two, the pyruvate molecules are transported into the mitochondria. The mitochondria are the organelles known as the energy "powerhouses" of the cells ( Figure below ). In the mitochondria, the pyruvate, which have been converted into a 2-carbon molecule, enter the Krebs cycle. Notice that mitochondria have an ... | A: mitochondria. |
What is the effect on pressure when the area of applied force is very concentrated?
Here are the choices:
A. direction increases
B. pressure disperses
C. pressure reduces
D. pressure increases | Pressure shows how concentrated the force is on a given area. The smaller the area to which force is applied, the greater the pressure is. Think about pressing a pushpin, like the one in Figure below , into a bulletin board. You apply force with your thumb to the broad head of the pushpin. However, the force that the p... | D: pressure increases. |
What two elements primarily make up the sun?
Here are the choices:
A. calcium and helium
B. nitrogen and argon
C. oxygen and hydrogen
D. hydrogen and helium | The Sun is made almost entirely of the elements hydrogen and helium. The Sun has no solid material. Most atoms in the Sun exist as plasma . Plasma is superheated gas with an electrical charge. Because the Sun is made of gases, it does not have a defined outer boundary. Like Earth, the Sun has an internal structure. The... | D: hydrogen and helium. |
Adipose is a connective tissue made up of cells called what?
Here are the choices:
A. adipocytes
B. hepatocytes
C. oocytes
D. keratinocytes | Figure 33.16 Adipose is a connective tissue is made up of cells called adipocytes. Adipocytes have small nuclei localized at the cell edge. | A: adipocytes. |
Where are about 75% of the tar sands in the world located?
Here are the choices:
A. alberta, canada and peru
B. china and onatrio, canada
C. venezuela and alberta, canada
D. venezuela and onatrio,canada | About 75% of the tar sands in the world are in Venezuela and Alberta, Canada ( Figure below ). Large areas of land are degraded when tar sands are mined. A tremendous amount of waste rock is produced from mining tar sands. | C: venezuela and alberta, canada. |
Does pressure increase or decrease when gas particles heat up?
Here are the choices:
A. decreases
B. stays constant
C. increase
D. stagnates | Like a gas, plasma lacks a fixed volume and shape. Unlike a gas, it can conduct electricity and respond to magnetism. | C: increase. |
What are the two most common vision problems?
Here are the choices:
A. colorblindness and nearsightedness
B. colorblindness and farsightedness
C. glaucoma and nearsightedness
D. nearsightedness and farsightedness | Many people have problems with their vision , or ability to see. Often, the problem is due to the shape of the eyes and how they focus light. Two of the most common vision problems are nearsightedness and farsightedness, which you can read about below. You may even have one of these vision problems yourself. Usually, t... | D: nearsightedness and farsightedness. |
What is the pair of bean-shaped organs that filters blood and produces urine?
Here are the choices:
A. kidneys
B. arteries
C. lungs
D. heart | The kidneys are a pair of bean-shaped organs just above the waist. They are important organs with many functions in the body, including producing hormones, absorbing minerals, and filtering blood and producing urine. | A: kidneys. |
Met, asn, trp, and gln connect together like beads on a necklace and are an example of what type of acids?
Here are the choices:
A. polymer acids
B. amino acids
C. peptic acids
D. organism acids | Amino acids connect together like beads on a necklace. MET, ASN, TRP, and GLN refer to four different amino acids. | B: amino acids. |
What is a carbon-based compound that is found in living things called?
Here are the choices:
A. biochemical compound
B. genetic compound
C. biological compound
D. organic compound | Glucose is an example of a biochemical compound. The prefix bio- comes from the Greek word that means “life. ” A biochemical compound is any carbon-based compound that is found in living things. Biochemical compounds make up the cells and tissues of living things. They are also involved in all life processes, including... | A: biochemical compound. |
What do you call a mirror shaped like the inside of a bowl?
Here are the choices:
A. curved
B. circular
C. convex
D. concave | A concave mirror is shaped like the inside of a bowl. The type of image it forms depends on where the object is relative to the focal point. The image may be real, upside down, and reduced in size; or it may be virtual, right-side up, and enlarged. | D: concave. |
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