Pretest

Question 1

Which statement best illustrates why carbon is so important to life on Earth?

Revolt · Accepted Answer

Carbon-based macromolecules are found in living things.

Question 2

Which pair of molecules both contain carbon atoms?

Revolt · Accepted Answer

fats and proteins

Question 3

Which reason best explains why carbon is able to form macromolecules?

Revolt · Accepted Answer

Carbon can bond with many elements.

Question 4

Which substance is considered a building block for all living things?

Revolt · Accepted Answer

carbon

Question 5

What is the primary function of the carbon cycle?

Revolt · Accepted Answer

recycling the supply of carbon on Earth

Question 6

Which reason best explains why living things need carbon?

Revolt · Accepted Answer

Carbon bonds are a source of energy.

Question 7

What happens when humans burn fossil fuels?

Revolt · Accepted Answer

Carbon is released into the atmosphere.

Question 8

The chemical formula for the major component of palm kernel oil is CH sub 3 open paren CH sub 2 close paren sub 14 CO sub 2 cap h The chemical formula for the carbohydrate glucose is cap c sub 6 cap h sub 12 cap o sub 6 Which statement best describes these macromolecules as foods?

Revolt · Accepted Answer

Palm kernel oil would provide more energy than glucose because it contains more carbon bonds, which release energy when broken.

Question 9

Which shows the most direct path that carbon can take through the carbon cycle?

Revolt · Accepted Answer

plant→animal→atmosphere

Question 10

By which process are fossil fuels formed?

Revolt · Accepted Answer

decomposition

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