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Biology Exam6th
| Question | Answer |
|---|---|
| What's NOT an observation about an insect? | The insect's pattern shows that it is poisonous |
| The statement "the worm is 2 cm long" is a(an) | quantitative observation |
| The statement "the worm is 2 cm long" is a(an) | quantitative observation |
| An inference is | a logical interpretation of an observation |
| To be useful in science, a hypothesis must be | testable |
| The term "spontaneous generation" means that | living things can arise from nonliving things |
| What statement about a controlled experiment is true? | Only one variable is tested at a time |
| A scientific theory is | a well-tested explanation that unifies a broad range of observations |
| The process in which two cells from different parents unite to produce the first cell of a new organism is called | sexual reproduction |
| The process by which organisms keep their internal conditions relatively stable is called | homeostasis |
| An instrument that produces images by focusing light rays is called a | light microscope |
| The positively charged particle in ana atom is the | proton |
| Two or more different atoms are combined in definite proportions in an | compound |
| A covalent bond is formed by the | sharing of electrons |
| When you shake sugar and sand together in a test tube, you cause them to form a | mixture |
| A compound that produces hydrogen ions in solution is a(an) | acid |
| In polymerization, complex molecules are formed by the joining together of | macromolecules |
| Proteins are polymers formed from | amino acids |
| An enzyme speeds up a reaction by | lowering the activation energy |
| In a chemical reaction, a reactant binds to an enzyme at a region known as the | active site |
| All of life on Earth exists in a region known as | an ecosystem |
| Groups of different species that live together in defined area make up a(an) | community |
| Autotrophs are organisms that | use energy they take in from the environment to convert inorganic molecules into complex organic molecules |
| The series of steps in which a large fish eats a small fish that has eaten algae is a | food chain |
| The total mass of living tissue at each trophic level can be shown in a(an) | biomass pyramid |
| Nutrients move through an ecosystem in | biogeochemical cycles |
| In the nitrogen cycle, bacteria that live on the roots of plants | change nitrogen gas into ammonia |
| Which biogeochemical cycle does NOT involve a stage where the chemical enters the atmosphere? | phosphorous cycle |
| When an ecosystem is limited by a single nutrient that either is scare or cycles very slowly, this substance is called a(an) | limiting nutrient |
| What human activity was NOT important in transforming the biosphere? | aquaculture |
| Civilizations could not develop without | agriculture |
| A resource that cannot be replenished by natural processes is called | nonrenewable |
| The conversion of a previously soil-rich area to a sandy desert is called | desertification |
| The burning of fossil fuels may NOT cause | the ozone hole |
| The sum total of the variety of organisms on Earth is referred to as | biodiversity |
| When land development divides a habitat into isolated "islands" of the original area, the result is called | fragmentation |
| A species that enters an environment where it has not lived before is called a(an) | invasive species |
| A species whose population size is declining so rapidly that it could soon become extinct is said to be | |
| A species whose population size is declining so rapidly that it could soon become extinct is sad to be | endangered |
| The concept of using natural resources at a rate that does not deplete them is called | sustainable development |
| Despite differences in size and shape, al cells have cytoplasm is a(an) | nucleus |
| Despite differences in size and shape, all cells have cytoplasm and a | cell membrane |
| If a cell of an organism contains a nucleus, the organism is a(an) | eukaryote |
| Distinct threadlike structures containing genetic information are called | chromosomes |
| Which organelle converts the chemical energy in food into a form that cells can use? | mitochondrion |
| Cell membranes are constructed mainly of | lipid bilayers |
| The movement of water molecules across a selectively permeable membrane is known as | osmosis |
| Which organelle converts the chemical energy in foot into a form that calls can use? | mitochondrion |
| A substance that moves across a cell membrane without using the cell's energy tends to move | away from the area where it is more concentrated |
| A tissue is composed of a group of | similar cells |
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