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Biology 9 Weeks
| Question | Answer |
|---|---|
| The work of scientists begins with | careful observations |
| Hypotheses may arise from- a. prior knowledge b. logical inferences c. imaginative guesses d. all of the above | d |
| A controlled experiment allows the scientist to isolate and test | a single variable |
| Scientists publish the details of important experiments so that.... a. their work can be repeated b. their experimental procedures can be reviewed c. other can try to reproduce the result d. all of the above | d |
| Well tested explanation that unifies a broad range of observations is a | theory |
| All of the following are characteristics of all living things EXCEPT a. growth b. reproduction c. movement d. use energy | c. movement |
| Biology is the study of | the living world |
| The process by which org. keep their internal conditions stable is | homeostasis |
| Term for group of org. of one type living in same plac | population |
| In metric system, basic unit of length is | meter |
| Which is not a mesasurment in SI... meter ounce liter gram | ounce |
| Instrument that allows light to pass through the specimen and uses 2 lenses to form an image | compound light microscope |
| What is the term given to a group of cells that develop from a single original cell | cell culture |
| What technique is used to seperate different cell parts | cell fractionation |
| Safety procedures are important when working... in a lab in a field w animal all of the above | d |
| The info gathered from observations is | data |
| smallest units considered to be alive | cells |
| a revised version of the original ____ system is called the SI | metric |
| the ____ microscope is generally used in high school labs. | compound light |
| instrument used to seperate cell parts | centrifuge |
| what is the boiling point of water in celsius | 100 degrees C |
| 3 particle that make up an atom | proton neutron electron |
| nucleus is made up of | protons and neutron |
| isotopes are atoms of the same element w the same number of protons and ___ | a different number of neutrons |
| what is formed by the combo of 2 or more elements in definite proportions | compound |
| a covalent bond is formed as a result of | sharing electron pair |
| water molecules are polar, with | the oxygen side being slightly negative and the hydrogen side being slightly positive |
| solution | evenly distributed mixture of 2+ substances |
| suspensions are mixtures of | water and undissolved material |
| Solutions that contain concentrations of h+ ions lower than pure water are | bases |
| main source of energy for living things | carbs |
| Is storing and transmitting heredity a function of proteins | NO |
| process that changes one set of chemicals into another | chemical reactions |
| term used to describe energy needed to get a reaction started | activation energy |
| chemical reactions that release energy | often occur spontaneously |
| substance that accelerates the rate of a chemical reaction is a | catalyst |
| because they have the same number of protons and electrons, all isotopes of an element have the same | chemical properties |
| chemical bond formed by transfer of electrons is an | ionic bond |
| water molecule is polar bc there is an uneven distribution of electrons between the oxygen and ____ atoms | hydrogen |
| the elements or compounds produced by a chemical reaction are known as | products |
| what is a molecule | smallest unit of most compounds |
| main types of chemical bonds | ionic and covalent bonds |
| 4 groups of organic compounds found in living things | carbs, lipids, nucleic acids, proteins |
| what is a mixture | material composed of 2 or more elements or compounds that are physically mixed but not chemically combined |
| one of the most important factors in determining whether a chemical reaction will occur | energy changes |
| branch of biology dealing with interactions among org. and between org. and their env. is | ecology |
| combined portions of earth in which all living things exist is called the | biosphere |
| which is NOT a basic method used by ecologists to study the living world. a. experimenting b. classifying c. modeling d. observing | b. classifying |
| a mathematical formula designed to predict population fluctuations in a community could be called a | ecological model |
| what is the original source of almost all the energy in most ecosystems? | sunlight |
| an org. that cannot make its own food | heterotroph |
| org. that obtain nutrients by breaking down dead plants and animals are | decomposers |
| what is an ecological model of the relationships that from a network of complex interactions among org. in community form producers to decomposers | food web |
| what is term for each step in transfer of energy and matter within food web | trophic level |
| only 10% of the energy stored in an org. can be passed on to the next trophic level. Of the remaining energy some is used for the org. life processes and the rest is | eliminated as heat |
| ecologists use tools to such as binoculars and microscopes to MODEL changes in the environment. T or F | false, observe |
| animals that feed on plants are called consumers. T OR F | true |
| in an ecological pyramid, the biomass of org. INCREASES at each successive level. T OR F | false, decrease |
| a lake that is protected form receiving the runoff from a cultivated field is likely to remain a healthy ecosystem. T OR F | true |
| only about 10% of the energy in a trophic level is available to org. at the next level. T OR F. | true |
| scientist classify the nitrogen, carbon, and water cycles as biogeochemical cycles. T OR F | true |
| a biome is a group of ecosystems that have the same climates and similar dominant communities. T OR F. | true |
| the passage of energy from one org. to another according to a particular feeding sequence is called a food chain. T OR F | true |
| ecologists can make predictions using ecological models . T OR F | true |
| aquatic ecosystems can receive a large input of a limiting nutrient from the runoff of heavily fertilized fields . T OR F | true |
| the use of radio tags, satellites, and microscopes are all techniques employed in the basic ecological research method of ____ | observing |
| plant eating animals such as cows are __ | herbivores |
| org. that break down organic matter and return it to the env. are called ___ | decomposers |
| chemical substances that an org. requires to live are called _____ | nutrients |
| living org. require nitrogen to make _____ which are used to make proteins | nitrates and nitrites; amino acids |
| write the chemical equation for photosynthesis | 6CO₂ + 6H₂O ----------> C₆H₁₂O₆ + 6O₂ light energy |
| repeated movement of water between earth's surface and the atmosphere | water cycle |
| total amount of living tissue within a given trophic level is the | biomass |
| what can form is a lake receives a large input of a limiting nutrient? | algae or algal bloom |
| what is the process by which bacteria convert nitrogen gas in the air to ammonia | nitrogen fixatoin |
Created by:
emerybrown