Eight Point Five

Humans require nitrogen in order to synthesize proteins needed to carry

out life processes. Which best describes how humans obtain the nitrogen

they need to synthesize proteins?

• Humans obtain nitrogen by breathing it in from the atmosphere.

• Humans obtain nitrogen by consuming plant and animal proteins.

• Humans obtain nitrogen by synthesizing it in their cells from other

  elements.

Bacterial cells take in nutrients from the environment to stay alive. Which best describes why bacterial cells require nutrients to stay alive?

• Nutrients allow the bacterial cells to undergo photosynthesis.

• Nutrients allow the bacterial cells to grow and reproduce.

• Nutrients allow the bacterial cells to mutate their DNA.

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By which process do plants provide energy and molecules required for

building materials, growth, and survival?

• chemosynthesis

• photosynthesis

• fermentation

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Which best explains why it is important for an animal’s diet to include protein?

• Proteins are easily broken down to produce fast energy.

• Proteins help the animal’s immune system fight diseases.

• Proteins provide fat needed to keep the animals warm in the winter.

• Proteins provide the building blocks animals need to build and repair

  body tissues.

List the steps of the scientific method

d

e

f

c

b

a

Conduct experiment

Ask a question

Communicate results

Draw conclusions

Form a hypothesis

Analyze results

If just one species in a food chain disappears,

• all of the other organisms will have more food

• The whole thing will collapse

• any organisms that depend on that species for food will not be able to meet their needs

• no other organisms will be affected

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The slow changes that take place in an ecosystem that has been disturbed. When one group of organisms replaces another group until a stable community is formed is called a(an) ______.

• food chain

• succession

• predator

• energy pyramid

A __________ is a model showing the path of energy through a series of organisms in an ecosystem.

• food chain

• succession

• predator

• energy pyramid

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The animal in a predator-prey relationship that captures and eats other animals is called a(an)__________.

• food chain

• succession

• predator

• energy pyramid

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A ____________ is a model that shows the amount of energy that is passed on at each level of the food chain.

• food chain

• succession

• predator

• energy pyramid

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