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MILLER & LEVINE BIOLOGY UNIT 2 ECOLOGY QUESTIONS AND ANSWERS 2024
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MILLER & LEVINE BIOLOGY UNIT 2 ECOLOGY QUESTIONS AND ANSWERS 2024
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MILLER & LEVINE BIOLOGY UNIT 2ECOLOGY
Examples of organic (carbon-containing) compounds found in living things -
ANSWERS-carbohydrates, lipids, proteins, nucleic acids
Nitrogen cycle - ANSWERS-Bacteria convert nitrogen gas into ammonia by
nitrogen fixation. Other soil bacteria convert the fixed nitrogen into nitrates and
nitrites. Once these forms of nitrogen are available, primary producers can use
them to make proteins and nucleic acids. Consumers eat the producers and reuse
nitrogen to make their own nitrogen-containing compounds. Decomposers
release nitrogen from waste and dead organisms as ammonia, nitrates, and
nitrites, that producers may take up again. Other soil bacteria obtain energy by
converting nitrates into nitrogen gas, which is released into the atmosphere by
denitrification. A relatively small amount of nitrogen gas is converted into usable
forms by lightning by atmospheric nitrogen fixation. Humans add nitrogen to the
biosphere through the manufacture and use of fertilizers.
Examples of nitrogen-containing compounds found in living things - ANSWERS-
proteins, nucleic acids
Phosphorus cycle - ANSWERS-As rocks and sediments wear down, phosphate is
released. Some phosphate stays on land and cycles between organisms and soil.
Plants bind phosphate into organic compounds when they absorb it from soil and
water. Organic phosphate moves through the food web, from producers to
consumers, and to the rest of the ecosystem. Other phosphate washes into rivers
, and streams, where it dissolves and may eventually end up in the ocean, where
marine organisms process and incorporate it into biological compounds.
Examples of phosphorus-containing compounds found in living things - ANSWERS-
nucleic acids
limiting nutrient - ANSWERS-single essential nutrient that limits productivity in an
ecosystem
phytoplankton - ANSWERS-photosynthetic algae found near the surface of the
ocean
zooplankton - ANSWERS-a diverse group of small, swimming animals that feed on
marine algae
nutrient - ANSWERS-chemical substance that an organism needs to sustain life
nitrogen fixation - ANSWERS-process of converting nitrogen gas into nitrogen
compounds that plants can absorb and use
denitrification - ANSWERS-process by which bacteria convert nitrates into
nitrogen gas
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