Unit 3 – Chapter 4 Quiz

The function of an enzyme is always to:

• break down large molecules into smaller ones.

• speed up the rate of a reaction.

• build larger molecules from smaller ones.

• digest food products.

In competitive inhibition, the inhibitor should be the same shape as the:

• active site of the enzyme.

• allosteric site of the enzyme.

• non-competitive inhibitor.

• substrate.

At low temperatures, enzyme activity is low due to:

• low kinetic energy of the enzyme and substrates.

• low substrate concentration.

• denaturation of the enzyme.

• competitive inhibition.

If substrate concentration is increased substantially and no increase in the rate of a reaction is observed, the most likely explanation is:

• competitive inhibition of the enzyme, but not saturation.

• saturation of the enzyme, but not competitive inhibition.

• both saturation and competitive inhibition of the enzyme.

• neither saturation nor competitive inhibition of the enzyme.

NADP is an example of:

• an enzyme.

• a protein.

• a coenzyme.

• a repressor.

The optimal temperature for most enzymes in the human body is approximately:

• 22°C.

• 27°C.

• 32°C.

• 37°C.

Which of the following graphs best represents what would be observed in an experiment testing the effect of substrate concentration on the rate of reaction?

• A

• B

• C

• D

Which of the following graphs best represents what would be observed in an experiment testing the effect of temperature on the rate of reaction?

• A

• B

• C

• D

Which of the following graphs best represents what would be observed in an experiment testing the effect of pH on the rate of reaction?

• A

• B

• C

• D

The level of protein structure that is least likely to be altered by denaturation of an enzyme is:

• primary structure.

• secondary structure.

• tertiary structure.

• quaternary structure.