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Macromolecules Answers

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What happens when humans burn fossil fuels?

A
Carbon is released into the atmosphere.
B
Carbon is removed from the atmosphere.
C
Carbon is added to the the carbon cycle.
D
Carbon is destroyed.
2
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Which action would most likely increase the amount of carbon in the environment?

A
choosing to burn coal to generate electricity
B
using energy-efficient appliances in place of older, traditional appliances
C
reusing shopping bags instead of using disposable plastic bags
D
recycling paper and plastic instead of throwing it in the trash
3

Which pair of molecules both contain carbon atoms?

A
fats and proteins
B
water and carbohydrates
C
nucleic acids and water
D
oxygen gas and fats
4

By which process are fossil fuels formed?

A
burning
B
photosynthesis
C
decomposition
D
cellular respiration
5

The chemical formula for the major component of palm kernel oil is CH3(CH2)14CO2H. The chemical formula for the carbohydrate glucose is C6H12O6. Which statement best describes these macromolecules as foods?

A
Glucose is a better energy source because it is the only one that can be broken down by living things.
B
Palm kernel oil would provide a quicker energy source than glucose because it has more carbon atoms that can be used.
C
Glucose is the only one that would provide energy to living things because it is a key product of respiration.
D
Palm kernel oil would provide more energy than glucose because it contains more carbon bonds, which release energy when broken.
6

What would most likely happen to life on Earth if the carbon cycle stopped?

A
Life would continue unchanged.
B
Life would cease to exist.
C
Only plants would be affected.
D
Only animals would be affected.
7

How will the level of carbon in the atmosphere change if humans do nothing to reduce their impact on the carbon cycle?

A
Carbon will be removed from the atmosphere altogether.
B
The level of carbon in the atmosphere will decrease.
C
Carbon in the atmosphere will remain the same.
D
The level of carbon in the atmosphere will increase.
8

What would most likely happen to the carbon cycle if there were no more plants on Earth?

A
Animals would consume more carbon.
B
More carbon would be released from fossil fuels.
C
Carbon would build up in the atmosphere.
D
Animals would perform more photosynthesis.
9

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

A
hydrogen
B
glucose
C
carbon
D
protein
10

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

A
Carbon occurs as a solid, a liquid, and a gas.
B
Carbon is found in both the living and nonliving worlds.
C
Carbon is stored in large quantities in fossil fuels.
D
Carbon-based macromolecules are found in living things.

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