questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
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What bonds form because they give atoms a more stable arrangement of electrons?
Here are the choices:
A. Ionic bond
B. covalent
C. Hydrogen bond
D. Polar bond | Covalent bonds form because they give atoms a more stable arrangement of electrons. Look at the hydrogen atoms in Figure above . Alone, each hydrogen atom has just one electron. By sharing electrons with another hydrogen atom, it has two electrons: its own and the one in the other hydrogen atom. The shared electrons ar... | B: covalent. |
What is the common abbreviation for noting the rhesus blood type?
Here are the choices:
A. h2
B. RNA
C. rh
D. AB | Rhesus blood type is determined by one common antigen. A person may either have the antigen (Rh + ) or lack the antigen (Rh - ). | C: rh. |
Coral reefs are a type of what large community and have the highest biodiversity on earth?
Here are the choices:
A. phylum
B. biome
C. taxon
D. order | USFWS Pacific. Coral reefs are one of the biomes with the highest biodiversity on Earth . CC BY 2.0. | B: biome. |
What large organelle comprised of cup-shaped discs is found close to the nucleus of the cell, where it modifies proteins that have been delivered in transport vesicles?
Here are the choices:
A. golgi apparatus
B. mitochondria
C. ribosome
D. chloroplast | The Golgi apparatus is a large organelle that is usually made up of five to eight cup-shaped, membrane-covered discs called cisternae, as shown in Figure above . The cisternae look a bit like a stack of deflated balloons. The Golgi apparatus modifies, sorts, and packages different substances for secretion out of the ce... | A: golgi apparatus. |
The penis, testes and epididymes are structures in what male anatomical system?
Here are the choices:
A. immune
B. endocrine
C. protective
D. reproductive | The male reproductive system consists of structures that produce sperm and secrete testosterone. They include the penis, testes, and epididymes. | D: reproductive. |
When waves are reflected at the same angle, what is it called?
Here are the choices:
A. field of view
B. phenomenon of reflection
C. refraction
D. angle of reflection | Reflected waves have the same speed and frequency as the original waves before they were reflected. However, the direction of the reflected waves is different. When waves strike an obstacle head on, the reflected waves bounce straight back in the direction they came from. When waves strike an obstacle at any other angl... | D: angle of reflection. |
What us state leads all states in producing geothermal energy?
Here are the choices:
A. nevada
B. Texas
C. california
D. virginia | Geothermal energy is an excellent resource in some parts of the world. Iceland gets about one fourth of its electricity from geothermal sources. In the United States, California leads all states in producing geothermal energy. Geothermal energy in California is concentrated in the northern part of the state. The larges... | C: california. |
Sexual signaling molecules released by fungi are known as what?
Here are the choices:
A. hormones
B. vibrations
C. pheromones
D. sperm | C: pheromones. | |
Which energy is momentarily stored in tendons after each leap provides a boost for the next leap?
Here are the choices:
A. magnetic
B. alternating
C. thermal
D. kinetic | D: kinetic. | |
What is the name for a simple machine that consists of two inclined planes?
Here are the choices:
A. wedge
B. pulley
C. lever
D. slope | Imagine trying to slice a tomato with a fork or spoon instead of a knife, like the one in Figure below . The knife makes the job a lot easier because of the wedge shape of the blade. A wedge is a simple machine that consists of two inclined planes. But unlike one inclined plane, a wedge works only when it moves. It has... | A: wedge. |
Each gamete will have one copy of each chromosome following which process involving cell division?
Here are the choices:
A. meiosis
B. osmosis
C. genomes
D. mutations | Figure 7.8 Following meiosis, each gamete has one copy of each chromosome. Nondisjunction occurs when homologous chromosomes (meiosis I) or sister chromatids (meiosis II) fail to separate during meiosis. | A: meiosis. |
Where do most skin structures originate in?
Here are the choices:
A. hypodermis
B. epidermis
C. dermis
D. cuticle | Layers of Human Skin. The outer layer of the skin is the epidermis, and the inner layer is the dermis. Most skin structures originate in the dermis. | C: dermis. |
What are the primary producers in the ocean?
Here are the choices:
A. phytoplankton
B. zooplankton
C. fish
D. algea | Phytoplankton are the primary producers in the ocean. They form the base of most marine food chains. | A: phytoplankton. |
Chemists use simple diagrams to show an atom’s valence electrons and how they do what?
Here are the choices:
A. escape
B. bond
C. react
D. transfer | Lewis Diagrams Chemists use simple diagrams to show an atom’s valence electrons and how they transfer. These diagrams have two advantages over the electron shell diagrams introduced in Chapter 2 "Elements, Atoms, and the Periodic Table". First, they show only valence electrons. Second, instead of having a circle around... | D: transfer. |
Soil erosion is a natural process, but what can increase it unnaturally?
Here are the choices:
A. human activities
B. volcanic eruption
C. human preservation
D. animal activies | Soil erosion is a natural process, but human activities can increase it. | A: human activities. |
Which part of the reproductive process only contributes one set of chromosomes?
Here are the choices:
A. sperm
B. ovum
C. plasma
D. egg | This sperm is ready to penetrate the membrane of this egg. Notice the difference in size of the sperm and egg. Why is the egg so much larger? The egg contributes all the cytoplasm and organelles to the zygote. The sperm only contributes one set of chromosomes. | A: sperm. |
What do you call different organs working together?
Here are the choices:
A. maturation systems
B. organ systems
C. cellular system
D. endocrine system | B: organ systems. | |
A machine is any device that makes work easier by doing what?
Here are the choices:
A. changing a force
B. removing barriers
C. changing molecules
D. moving things | A machine is any device that makes work easier by changing a force. When you use a machine, you apply force to the machine. This force is called the input force. The machine, in turn, applies force to an object. This force is called the output force. Recall that work equals force multiplied by distance:. | A: changing a force. |
When electricity is passed through solid sodium it changes into what and gives off light?
Here are the choices:
A. plasma
B. gas
C. liquids
D. hydrocarbons | A vapor light also produces visible light by electroluminescence The bulb contains a small amount of solid sodium or mercury as well as a mixture of neon and argon gases. When an electric current passes through the gases, it causes the solid sodium or mercury to change to a gas and emit visible light. Sodium vapor ligh... | B: gas. |
What type of plant makes up nearly all plant species?
Here are the choices:
A. angiosperms
B. fungus
C. microbes
D. gymnosperms | A: angiosperms. | |
Prokaryotic cells have what structure outside their plasma membrane?
Here are the choices:
A. sodium channel
B. cell membrane
C. cell wall
D. plasma wall | Most prokaryotic cells are much smaller than eukaryotic cells. They have a cell wall outside their plasma membrane. Prokaryotic DNA consists of a single loop. Some prokaryotes also have small, circular pieces of DNA called plasmids. | C: cell wall. |
The hemolymph and body cells exchange chemicals within what body part?
Here are the choices:
A. the gums
B. the heart
C. the lungs
D. the sinuses | D: the sinuses. | |
Types of compounds include covalent and which other compounds?
Here are the choices:
A. reactant
B. solvent
C. soluble
D. ionic | Types of compounds include covalent and ionic compounds. They differ in the nature of the bonds that hold their atoms or ions together. | D: ionic. |
Animals can transport what waste material in the circulatory system and store it safely at high concentrations?
Here are the choices:
A. urea
B. carbon
C. phosphorus
D. proteins | A: urea. | |
What can happen if there is a blockage in circulation to the brain?
Here are the choices:
A. automation
B. memory
C. stroke
D. hydration | Atherosclerosis normally begins in late childhood and is typically found in most major arteries. It does not usually have any early symptoms. Causes of atherosclerosis include a high-fat diet, high cholesterol, smoking, obesity, and diabetes. Atherosclerosis becomes a threat to health when the plaque buildup prevents b... | C: stroke. |
The high points of a transverse wave are called what?
Here are the choices:
A. ridges
B. points
C. valleys
D. crests | The high points of a transverse wave are called crests, and the low points are called troughs. | D: crests. |
Besides greenland, where are the earth's largest ice sheets found?
Here are the choices:
A. Asia
B. antarctica
C. Europe
D. North America | Nearly all glacial ice is in the polar regions. The largest ice sheets are in Antarctica and Greenland. The remaining 1% of Earth's ice is found elsewhere, like in the mountains, for example. At higher altitudes, temperatures are colder. Snow is more likely to fall and not melt. Except Australia, every continent has gl... | B: antarctica. |
What kind of path does the energy of an electromagnetic wave take?
Here are the choices:
A. fluctuating
B. circuitous
C. straight line
D. elliptical | The energy of an electromagnetic wave travels in a straight line along the path of the wave. The moving light wave has associated with it an oscillating electric field and an oscillating magnetic field. Scientists often represent the electromagnetic wave with the image below. | C: straight line. |
The direct conversion of a solid to a gas, without an intervening liquid phase, is called what?
Here are the choices:
A. sublimation
B. isolation
C. amplification
D. insertion | The direct conversion of a solid to a gas, without an intervening liquid phase, is calledsublimation. The amount of energy required to sublime 1 mol of a pure solid is theenthalpy of sublimation (ΔHsub). Common substances that sublime at standard temperature and pressure (STP; 0°C, 1 atm) include CO2 (dry ice); iodine ... | A: sublimation. |
Amino acids are the building blocks of what macromolecules?
Here are the choices:
A. carbohydrates
B. sugars
C. lipids
D. proteins | 3.4 Proteins Proteins are a class of macromolecules that perform a diverse range of functions for the cell. They help in metabolism by providing structural support and by acting as enzymes, carriers, or hormones. The building blocks of proteins (monomers) are amino acids. Each amino acid has a central carbon that is li... | D: proteins. |
What force opposes a motion of a moving body? for example a car breaking on a road.
Here are the choices:
A. vibration
B. friction
C. thermal
D. tension | Friction is a force that opposes motion between any surfaces that are touching. Friction can work for or against us. For example, putting sand on an icy sidewalk increases friction so you are less likely to slip. On the other hand, too much friction between moving parts in a car engine can cause the parts to wear out. ... | B: friction. |
The pain of angina means the heart muscle fibers need more what?
Here are the choices:
A. nitrogen
B. oxygen
C. water
D. carbon | Coronary heart disease often does not have any symptoms. A symptom of coronary heart disease is chest pain. Occasional chest pain can happen during times of stress or physical activity. The pain of angina means the heart muscle fibers need more oxygen than they are getting. Most people with coronary heart disease often... | B: oxygen. |
Acids and bases are important in living things because what proteins typically can perform their job only at a certain level of acidity?
Here are the choices:
A. hormones
B. enzymes
C. catalysts
D. vitamins | Acids and bases are important in living things because most enzymes can do their job only at a certain level of acidity. Cells secrete acids and bases to maintain the proper pH for enzymes to work. For example, every time you digest food, acids and bases are at work in your digestive system. Consider the acidic environ... | B: enzymes. |
Cellular respiration that proceeds in the presence of oxygen is known as what?
Here are the choices:
A. digestive respiration
B. aerobic respiration
C. anaerobic respiration
D. kinetic respiration | Then, about 2 or 3 billion years ago, oxygen was gradually added to the atmosphere by early photosynthetic bacteria. After that, living things could use oxygen to break down glucose and make ATP. Today, most organisms make ATP with oxygen. They follow glycolysis with the Krebs cycle and electron transport to make more ... | B: aerobic respiration. |
Electromagnetic radiation behaves like particles as well as what?
Here are the choices:
A. fluids
B. currents
C. waves
D. points | Electromagnetic radiation behaves like particles as well as waves. This prompted Albert Einstein to develop his wave-particle theory. | C: waves. |
Claw ends of hammers and flagpole pulleys are examples of simple machines that reverse what?
Here are the choices:
A. direction of force
B. direction of power
C. direction of work
D. direction of friction | Some machines change the direction of the force applied by the user. They may or may not also change the strength of the force or the distance over which the force is applied. Two examples of machines that work this way are the claw ends of hammers and flagpole pulleys. You can see in the Figure below how each of these... | A: direction of force. |
Lipids are also know by what name?
Here are the choices:
A. acids
B. proteins
C. sugars
D. fats | D: fats. | |
Roots, stems and leaves are organs commonly found in what?
Here are the choices:
A. fungi
B. animals
C. plants
D. algae | The three types of tissues work together in most plant organs. Three organs commonly found in modern plants are roots, stems, and leaves. | C: plants. |
What type of cells in the body fluids and tissues of most animals specifically interact with and destroy pathogens?
Here are the choices:
A. Dendritic cells
B. White blood cells
C. Microglial cells
D. immune cells | D: immune cells. | |
What makes breathing difficult due to respiratory system disease?
Here are the choices:
A. slippery air passages
B. narrow air passages
C. water in the lungs
D. weak lungs | respiratory system disease in which air passages of the lungs periodically become too narrow, making breathing difficult. | B: narrow air passages. |
What type of cell layer do flatworms have?
Here are the choices:
A. cuticle
B. endoderm
C. epidermis
D. mesoderm | Flatworms have a mesoderm cell layer and simple organ systems. They also show cephalization and bilateral symmetry. | D: mesoderm. |
What gland is located at the base of the brain and secretes the hormone melatonin?
Here are the choices:
A. pineal
B. pituitary
C. thymus
D. thyroid | The pineal gland is a tiny gland located at the base of the brain. It secretes the hormone melatonin. This hormone controls sleep-wake cycles and several other processes. | A: pineal. |
What are the most common roundworm parasites of people in the u. s.?
Here are the choices:
A. cutworms
B. pinworms
C. leeches
D. hookworms | Tiny pinworms are the most common roundworm parasites of people in the U. S. In some areas, as many as one out of three children are infected. Humans become infected when they ingest the nearly microscopic pinworm eggs. The eggs hatch and develop into adults in the host’s digestive tract. Adults lay eggs that pass out ... | B: pinworms. |
What is the type of landscape that occurs at higher latitudes than deserts, has short grasses and low bushes, and are dry because they are in continental interiors?
Here are the choices:
A. plateau
B. tundra
C. plains
D. steppe | Other dry climates get a little more precipitation. They are called steppes . These regions have short grasses and low bushes ( Figure below ). Steppes occur at higher latitudes than deserts. They are dry because they are in continental interiors or rain shadows. | D: steppe. |
The existence of (virtual) photons is possible only by virtue of the heisenberg uncertainty principle and can travel an unlimited distance, so the range ofthe electromagnetic for is what?
Here are the choices:
A. finite
B. simple
C. generated
D. infinite | CRITICAL THINKING QUESTIONS 19. How are neurons similar to other cells? How are they unique? 20. Multiple sclerosis causes demyelination of axons in the brain and spinal cord. Why is this problematic?. | D: infinite. |
What is energy that travels in the form of an electromagnetic wave?
Here are the choices:
A. microwave
B. light
C. sound
D. gravity | Light is one type of electromagnetic radiation . Light is energy that travels in the form of an electromagnetic wave. Pictured below is a diagram of an electromagnetic wave ( Figure below ). An electromagnetic (EM) wave has two parts: an electric field and a magnetic field. The electric and magnetic fields vibrate up a... | B: light. |
What changes water vapor to liquid water?
Here are the choices:
A. condensation
B. fermentation
C. global warming
D. combustion | Condensation changes water vapor to liquid water. As air rises higher into the atmosphere, it cools. Cool air can hold less water vapor than warm air. So some of the water vapor condenses into water droplets. Water droplets may form clouds. | A: condensation. |
What instrument, with a digital readout, is used by scientists to measure very small masses?
Here are the choices:
A. mixed balance
B. common balance
C. electronic balance
D. mechanical balance | To measure very small masses, scientists use electronic balances, like the one in the Figure below . This type of balance also makes it easier to make accurate measurements because mass is shown as a digital readout. In the picture, the balance is being used to measure the mass of a white powder on a plastic weighing t... | C: electronic balance. |
What element is released into the atmosphere by the burning of fossil fuels?
Here are the choices:
A. sulfur
B. oxygen
C. helium
D. carbon | water. Sulfur, critical to the 3–D folding of proteins (as in disulfide binding), is released into the atmosphere by the burning of fossil fuels, such as coal. The cycling of these elements is interconnected. For example, the movement of water is critical for the leaching of nitrogen and phosphate into rivers, lakes, a... | A: sulfur. |
What type of hydrocarbons contain at least one double or triple bond between carbon atoms?
Here are the choices:
A. catalytic
B. ionic
C. unsaturated
D. saturated | Unsaturated hydrocarbons contain at least one double or triple bond between carbon atoms. As a result, the carbon atoms are unable to bond with as many hydrogen atoms as they would if they were joined only by single bonds. This makes them unsaturated with hydrogen. Unsaturated hydrocarbons are classified on the basis o... | C: unsaturated. |
What is the general name for a wave that travels along the surface of a medium?
Here are the choices:
A. stack wave
B. speed wave
C. surface wave
D. light wave | A surface wave is a wave that travels along the surface of a medium. The medium is the matter through which the wave travels. Ocean waves are the best-known examples of surface waves. They travel on the surface of the water between the ocean and the air. | C: surface wave. |
Carbohydrates are an important group of biological molecules that includes sugars and these?
Here are the choices:
A. proteins
B. starches
C. vitamins
D. fats | Carbohydrates are an important group of biological molecules that includes sugars and starches. | B: starches. |
What types of drugs affect the brain and influence how a person can feel, think, or act?
Here are the choices:
A. antibiotics
B. psychoactive
C. prescription
D. analgesics | Many drugs affect the brain and influence how a person feels, thinks, or acts. Such drugs are called psychoactive drugs. They include legal drugs such as caffeine and alcohol, as well as illegal drugs such as cocaine and heroin. They also include certain medicines, such as antidepressant drugs and medical marijuana. | B: psychoactive. |
Chemical reactions always involve what?
Here are the choices:
A. physical change
B. heating
C. fuel
D. energy | Chemical reactions always involve energy. Energy is a property of matter that is defined as the ability to do work. When methane burns, for example, it releases energy in the form of heat and light. Other chemical reactions absorb energy rather than release it. | D: energy. |
An object undergoing circular motion experiences centripetal what?
Here are the choices:
A. vibration
B. velocity
C. acceleration
D. transmission | Linear or tangential acceleration refers to changes in the magnitude of velocity but not its direction. We know from Uniform Circular Motion and Gravitation that in circular motion centripetal acceleration, a c , refers to changes in the direction of the velocity but not its magnitude. An object undergoing circular mot... | C: acceleration. |
What rocks are formed by crystallization of chemical precipitates?
Here are the choices:
A. carbon sedimentary
B. volcanic
C. layered
D. chemical sedimentary | Sedimentary rocks formed by the crystallization of chemical precipitates are called chemical sedimentary rocks . Dissolved ions in fluids precipitate out of the fluid and settle out, just like the halite pictured below ( Figure below ). | D: chemical sedimentary. |
In some plants, the sporophyte is diploid, while the gametophyte is what?
Here are the choices:
A. haploid
B. humanoid
C. gametes
D. meiosis | The sporophyte produces haploid spores. The rhizoid buds to form a mature gametophyte. The zygote is housed in the venter. Figure 25.21 Which of the following statements about the fern life cycle is false? a. Sporangia produce haploid spores. The sporophyte grows from a gametophyte. The sporophyte is diploid and the ga... | A: haploid. |
A lipid is one of a highly diverse group of compounds made up mostly of what?
Here are the choices:
A. hydrocarbons
B. amines
C. proteins
D. nucleic acid | Lipids A lipid is one of a highly diverse group of compounds made up mostly of hydrocarbons. The few oxygen atoms they contain are often at the periphery of the molecule. Their nonpolar hydrocarbons make all lipids hydrophobic. In water, lipids do not form a true solution, but they may form an emulsion, which is the te... | A: hydrocarbons. |
During mitosis what is replicated in the primary spermatocyte?
Here are the choices:
A. mitochondira
B. rna
C. dna
D. oocyte | Two identical diploid cells result from spermatogonia mitosis. One of these cells remains a spermatogonium, and the other becomes a primary spermatocyte, the next stage in the process of spermatogenesis. As in mitosis, DNA is replicated in a primary spermatocyte, and the cell undergoes cell division to produce two cell... | C: dna. |
What can carry nerve impulses from tissues and organs to the spinal cord and brain?
Here are the choices:
A. healthy neurons
B. sensory neurons
C. motor neurons
D. respiratory neurons | Sensory neurons carry nerve impulses from tissues and organs to the spinal cord and brain. | B: sensory neurons. |
Chemical equations need to be balanced to satisfy the law of what?
Here are the choices:
A. material of matter
B. speed of matter
C. conservation of matter
D. glow of matter | Chemical equations need to be balanced to satisfy the law of conservation of matter. | C: conservation of matter. |
Which species in class insecta has three body segments, six jointed legs, and multiple head appendages?
Here are the choices:
A. sauropod
B. arachnid
C. mollusc
D. arthropod | arthropod in Class Insecta that has three body segments, six jointed legs, and multiple head appendages. | D: arthropod. |
Whether it's puppies or people, offspring and parents usually share many of what?
Here are the choices:
A. insects
B. clothes
C. traits
D. fruits | People have long known that offspring are similar to their parents. Whether it's puppies or people, offspring and parents usually share many traits. However, before Gregor Mendel's research, people didn't know how parents pass traits to their offspring. | C: traits. |
Connected to agriculture, forestry, mining, and urbanization, what is the single biggest cause of extinction today?
Here are the choices:
A. habitat loss
B. freshwater loss
C. global warming
D. hunting | The single biggest cause of extinction today is habitat loss . Agriculture, forestry, mining, and urbanization have disturbed or destroyed more than half of Earth’s land area. In the U. S. , for example, more than 99 percent of tall-grass prairies have been lost. Other causes of extinction today include:. | A: habitat loss. |
The hexapoda subphylum includes mainly what type of animal?
Here are the choices:
A. birds
B. insects
C. mammals
D. spiders | Living arthropods are divided into four subphyla. They are described in Table below . The Hexapoda subphylum includes mainly insects. There are so many insects and they are so important that they are described in greater detail below. | B: insects. |
What are living echinoderms divided into five of?
Here are the choices:
A. sexes
B. clades
C. species
D. classifications | B: clades. | |
Gases on earth originated from comets and what events?
Here are the choices:
A. volcanic eruptions
B. black holes
C. tides
D. supernovas | The earliest Earth did not have an atmosphere or free water. The planet was far too hot for gases and water to collect. The atmosphere and oceans that we see today evolved over time. The gases came from volcanic eruptions and from comets. | A: volcanic eruptions. |
What season is it in the southern hemisphere when it's winter in the northern?
Here are the choices:
A. summer
B. autumn
C. Winter
D. Spring | Winter solstice for the Northern Hemisphere happens on December 21 or 22. The North Pole of Earth's axis points away from the Sun ( Figure below ). Light from the Sun is spread out over a larger area. With fewer daylight hours in winter, there is also less time for the Sun to warm the area. When it is winter in the Nor... | A: summer. |
What is the name for areas where there is overlap between closely related species?
Here are the choices:
A. hybrid zones
B. mono zones
C. gap zones
D. extinction zones | 18.3 Reconnection and Rates of Speciation Speciation is not a precise division: overlap between closely related species can occur in areas called hybrid zones. Organisms reproduce with other similar organisms. The fitness of these hybrid offspring can affect the evolutionary path of the two species. Scientists propose ... | A: hybrid zones. |
By what are skeletal muscles attached to bones?
Here are the choices:
A. tendons
B. joints
C. ligaments
D. veins | Most muscles are skeletal muscles, which are attached to bones by tendons. Skeletal muscles work in pairs to move bones back and forth at joints. | A: tendons. |
What is the best-known geyser in the world that also faithfully erupts every 90 minutes?
Here are the choices:
A. devil's tongue
B. angel falls
C. old faithful
D. old guy | Old Faithful is the best-known geyser in the world. You can see a picture of it in Figure below . The geyser erupts faithfully every 90 minutes, day after day. During each eruption, it may release as much as 30,000 liters of water!. | C: old faithful. |
What kind of energy constitutes the total kinetic energy of all the atoms that make up an object?
Here are the choices:
A. atmospheric energy
B. kinetic energy
C. thermal energy
D. phenomena energy | The atoms that make up matter are in constant motion, so they have kinetic energy. All that motion gives matter thermal energy. Thermal energy is defined as the total kinetic energy of all the atoms that make up an object. It depends on how fast the atoms are moving and how many atoms the object has. Therefore, an obje... | C: thermal energy. |
What is the name for birds that live on water like ducks?
Here are the choices:
A. guineafowl
B. waterfowl
C. landfowl
D. gamefowl | Waterfowl are birds that live on the water. These include ducks, geese, swans, and pelicans, to name a few. Landfowl are ground-feeding birds such as chickens and turkeys. Penguins are a group of flightless birds adapted for life in the water with flippers. Diurnal raptors are birds of prey that hunt during the day. Th... | B: waterfowl. |
Spores are generally produced through what type of reproduction?
Here are the choices:
A. asexual
B. sexual
C. similar
D. hormone | The lifecycle of basidiomycetes includes alternation of generations (Figure 24.16). Spores are generally produced through sexual reproduction, rather than asexual reproduction. The club-shaped basidium carries spores called basidiospores. In the basidium, nuclei of two different mating strains fuse (karyogamy), giving ... | B: sexual. |
What do we call the diffusion of water across a membrane because of a difference in concentration?
Here are the choices:
A. hemostasis
B. cell transportation
C. electrolysis
D. osmosis | The diffusion of water across a membrane because of a difference in concentration is called osmosis. | D: osmosis. |
Scientific notation expresses a number as a what, times a power of 10?
Here are the choices:
A. function
B. coefficient
C. fraction
D. expression | Scientific notation expresses a number as a coefficient times a power of 10. | B: coefficient. |
How many valence electrons does a sodium atom have ?
Here are the choices:
A. six
B. three
C. two
D. one | A: Any element in group 1 has just one valence electron. Examples include hydrogen (H), lithium (Li), and sodium (Na). Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons). Examples include neon (Ne), argon (Ar), and krypton (Kr). Oxygen, like all the other el... | D: one. |
Within an organism, the cells that give rise to the next generation are known as germ cells, while those that do not (that is, the cells that die when the organism dies) are known as what cells?
Here are the choices:
A. somatic
B. xylem
C. cloning
D. neural | reality versus abstraction. It is organisms, whether single- or multi-cellular, that produce new organisms. As we will discuss in detail when we consider the origins of multicellular organisms, a cell within a multicellular organism normally cannot survive outside the organism nor can it produce a new organism - it dep... | A: somatic. |
An external opening in the what of amphibians allows wastes and gametes to exit the body?
Here are the choices:
A. oral cavity
B. anus
C. urethra
D. cloaca | All amphibians have digestive, excretory, and reproductive systems. All three of these organ systems use a single body cavity, called the cloaca. Wastes enter the cloaca from the digestive and excretory systems. Gametes enter the cloaca from the reproductive system. A single external opening in the cloaca allows the wa... | D: cloaca. |
What kind of scientists measure percentages of sand, silt, and clay?
Here are the choices:
A. amount scientists
B. petro scientists
C. soil scientists
D. texture scientists | Soil scientists measure the percentage of sand, silt, and clay in soil. They plot this information on a triangular diagram, with each type of particle at one corner ( Figure below ). | C: soil scientists. |
What hormone affects developent and maturation in animals?
Here are the choices:
A. dopamine
B. insulin
C. melatonin
D. thyroid | D: thyroid. | |
The three types of mammals are characterized by their method of what?
Here are the choices:
A. reproduction
B. specializaiton
C. differentiation
D. pattern | There are three types of mammals, characterized by their method of reproduction. All mammals, except for a few, are viviparous , meaning they produce live young instead of laying eggs. The monotremes , however, have birdlike and reptilian characteristics, such as laying eggs and a cloaca. An example of a monotreme is t... | A: reproduction. |
What planet has the most volcanoes?
Here are the choices:
A. Mars
B. venus
C. uranus
D. Earth | Venus has more volcanoes than any other planet. There are between 100,000 and one million volcanoes on Venus! Most of the volcanoes are now inactive. There are also a large number of craters. This means that Venus doesn’t have tectonic plates. Plate tectonics on Earth erases features over time. Figure below is an image... | B: venus. |
Gene duplications that are able to persist over many generations without causing too much harm to an organism or species can lead to what?
Here are the choices:
A. characteristics
B. permutations
C. mutations
D. parasites | C: mutations. | |
What keeps earth in orbit around the sun?
Here are the choices:
A. motion
B. momentum
C. gravity
D. energy | Why do satellites stay in orbit? Why don't they crash into Earth due to the planet's gravity? Newton’s law of universal gravitation describes what happens. Every object in the universe is attracted to every other object. Gravity makes an apple fall to the ground. Gravity also keeps you from floating away into the sky. ... | C: gravity. |
The work-energy theorem states that the net work on a system equals the change in what type of energy?
Here are the choices:
A. residual energy
B. new energy
C. kinetic energy
D. binary energy | How the Work-Energy Theorem Applies Now let us consider what form the work-energy theorem takes when both conservative and nonconservative forces act. We will see that the work done by nonconservative forces equals the change in the mechanical energy of a system. As noted in Kinetic Energy and the Work-Energy Theorem, ... | C: kinetic energy. |
Living organisms release carbon dioxide into the atmosphere by what method?
Here are the choices:
A. widespread respiration
B. genomic respiration
C. major respiration
D. cellular respiration | Cellular respiration by living things releases carbon into the atmosphere or ocean as carbon dioxide. | D: cellular respiration. |
Excretory organs that conserve what essential substance help terrestrial animals to avoid desiccation?
Here are the choices:
A. air
B. metabolytes
C. food
D. water | D: water. | |
Venus rotates slowly in a direction opposite to the direction of what?
Here are the choices:
A. its orbit
B. the sun
C. the orbit of Mars
D. the Earth's orbit | Venus rotates slowly in a direction opposite to the direction of its orbit. | A: its orbit. |
What is the ph of pure water?
Here are the choices:
A. 2
B. 7
C. 4
D. 5 | milk of magnesia, pH = 10.5 2. pure water, pH = 7 3. wine, pH = 3.0. | B: 7. |
The volume of a gas is comprised of about 10% matter. what is the rest?
Here are the choices:
A. open space
B. instead space
C. normal space
D. empty space | The volume of a gas contains only about 10% matter, with the rest being empty space. ΔHsub is equal to ΔHvap. | D: empty space. |
Heterotrophs is another name for what group?
Here are the choices:
A. omnivores
B. producers
C. consumers
D. autotrophs | Consumers are also called heterotrophs. There are several different types of heterotrophs depending on exactly what they consume. They may be herbivores, carnivores, or omnivores. | C: consumers. |
What is dna transcribed into after being replicated?
Here are the choices:
A. rna
B. diploid chromosomes
C. protein
D. gene | The three general transfers are believed to occur normally in most cells. These describe the normal flow of biological information. DNA is replicated, DNA is transcribed into RNA, and RNA is translated into protein. The three special transfers are known to occur under special conditions, such as with some viruses. The ... | A: rna. |
What is name of the phenomenon where similar traits evolve independently in species that do not share a common ancestry?
Here are the choices:
A. divergent evolution
B. coalescence evolution
C. convergent evolution
D. equation evolution | Figure 22.31 The force on a current-carrying wire in a magnetic field is. | C: convergent evolution. |
The flow of water through the sponge is unidirectional, driven by the beating of what?
Here are the choices:
A. antennae
B. flagella
C. fin
D. cilia | Sponges are characterized by a feeding system unique among animals. As sponges don't have mouths, they must feed by some other method. Sponges have tiny pores in their outer walls through which water is drawn. Cells in the sponge walls filter food from the water as the water is pumped through the body and out other lar... | B: flagella. |
What is the process for developing knowledge called?
Here are the choices:
A. creationism
B. science
C. theory
D. evolution | Science is a process for developing knowledge. Change in knowledge about the natural world is expected because there is often room for new observations which may challenge current views. No matter how well one theory explains a set of observations, it is possible that a different theory may explain them just as well or... | B: science. |
Arteries, veins, and capillaries are the three main types of what?
Here are the choices:
A. blood vessels
B. blood shapes
C. blood pathways
D. cell structures | A: blood vessels. | |
Amphibians may attract mates with what?
Here are the choices:
A. calls or scents
B. only calls
C. neither
D. only scents | Amphibians may attract mates with calls or scents. | A: calls or scents. |
What type of bounded nucleus do protists have?
Here are the choices:
A. Endoplasmic reticulum
B. Ribosomes
C. membrane
D. Mitochondrion | C: membrane. | |
Which body part is unsuitable for animals living on land?
Here are the choices:
A. gills
B. feet
C. lungs
D. hands | A: gills. |
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