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8. Chitinase is an enzyme that breaks down the chitin molecules in an insect's exoskeleton. The sequence of amino acids in the chitinase is an example of which level of protein structure?
secondary
tertiary
primary
quaternary
9. The amount of energy needed for a reaction to take place is the activation energy. Enzymes can lower the activation energy of a chemical reaction. Which of the following describes a way that this could happen?
Molecules can be brought together so they will bond more easily.
The enzyme distributes ATP to cells and then is destroyed.
More substrate is added by the enzyme.
The enzyme separates molecules from each other.
10. What is one way that RNA differs from DNA?
It is single-stranded.
It is not soluble in water.
It forms a double helix.
It has no nucleus.
11. Which molecule do mammals use to store extra glucose in their muscles?
baleen
starch
myosin
glycogen
12. Which molecule do plants use to store extra glucose?
lipid
myosin
starch
glycogen
13. Which element is present in all amino acids, but not necessarily in fats or carbohydrates?
hydrogen
nitrogen
carbon
oxygen
14. Which statement best describes the role of DNA in the body?
It contains genetic information.
It speeds up chemical reactions.
It provides a quick form of energy.
It provides long-term energy storage.
15. Which statement best explains how enzymes speed up chemical reactions?
Enzymes lower the activation energy of a reaction.
Enzymes change shape during chemical reactions.
Enzymes use light energy to speed up chemical reactions.
Enzymes gain heat from chemical reactions.
8. Chitinase is an enzyme that breaks down the chitin molecules in an insect's exoskeleton. The sequence of amino acids in the chitinase is an example of which level of protein structure?
secondary
tertiary
primary
quaternary
9. The amount of energy needed for a reaction to take place is the activation energy. Enzymes can lower the activation energy of a chemical reaction. Which of the following describes a way that this could happen?
Molecules can be brought together so they will bond more easily.
The enzyme distributes ATP to cells and then is destroyed.
More substrate is added by the enzyme.
The enzyme separates molecules from each other.
10. What is one way that RNA differs from DNA?
It is single-stranded.
It is not soluble in water.
It forms a double helix.
It has no nucleus.
11. Which molecule do mammals use to store extra glucose in their muscles?
baleen
starch
myosin
glycogen
12. Which molecule do plants use to store extra glucose?
lipid
myosin
starch
glycogen
13. Which element is present in all amino acids, but not necessarily in fats or carbohydrates?
hydrogen
nitrogen
carbon
oxygen
14. Which statement best describes the role of DNA in the body?
It contains genetic information.
It speeds up chemical reactions.
It provides a quick form of energy.
It provides long-term energy storage.
15. Which statement best explains how enzymes speed up chemical reactions?
Enzymes lower the activation energy of a reaction.
Enzymes change shape during chemical reactions.
Enzymes use light energy to speed up chemical reactions.
Enzymes gain heat from chemical reactions.