Question 1

As temperature increases up to the optimum temperature, what happens to the rate of enzymatic activity?

Accepted Answer

It increases.

Question 2

What is most likely to happen to an enzyme if the temperature rises significantly above its optimum?

Accepted Answer

The enzyme will denature and lose its function.

Question 3

Which of the following best describes the effect of pH on enzyme activity?

Accepted Answer

Each enzyme has an optimal pH at which it functions best.

Question 4

What is the role of an inhibitor in enzyme activity?

Accepted Answer

To bind to an enzyme and block its activity.

Question 5

Which of the following is true about irreversible inhibition?

Accepted Answer

The inhibitor forms a permanent complex with the enzyme.

Question 6

Penicillin is an example of which type of enzyme inhibition?

Accepted Answer

Irreversible inhibition

Question 7

Which equation best represents the formation of an irreversible enzyme-inhibitor complex?

Accepted Answer

$$E + I \rightarrow EI \rightarrow E-I$$

Question 8

Which statement best describes competitive inhibition?

Accepted Answer

The inhibitor is similar in shape to the substrate and competes for the active site.

Question 9

Alcohol dehydrogenase can bind to either alcohol or ethylene glycol. What type of inhibition is this an example of?

Accepted Answer

Competitive inhibition

Question 10

In non-competitive inhibition, where does the inhibitor bind?

Accepted Answer

To a site other than the active site

Question 11

Which of the following best explains why non-competitive inhibition decreases the amount of product formed?

Accepted Answer

It changes the shape of the enzyme so the active site is altered.

Question 12

Which of the following is a correct statement about reversible inhibition?

Accepted Answer

The inhibitor can be removed, restoring enzyme activity.

Question 13

A patient is poisoned with a substance that forms a permanent bond with an enzyme, preventing its function. What type of inhibition is this?

Accepted Answer

Irreversible inhibition

Question 14

Which of the following best describes the effect of a competitive inhibitor on enzyme activity?

Accepted Answer

It decreases the amount of product formed by competing with the substrate.

Question 15

Which of the following is the normal way enzyme-catalyzed reactions are regulated in cells?

Accepted Answer

Non-competitive inhibition

Question 16

If an enzyme's active site is altered so that it can no longer bind the substrate, what is the most likely cause?

Accepted Answer

A non-competitive inhibitor bound to the enzyme.

Question 17

Which of the following is a real-world example of competitive inhibition?

Accepted Answer

Alcohol dehydrogenase binding to either alcohol or ethylene glycol

Question 18

What is the effect on enzyme activity if the pH is changed far from the enzyme's optimum?

Accepted Answer

The enzyme's shape changes and activity decreases.

Question 19

Which of the following best describes the relationship between enzyme structure and function?

Accepted Answer

Enzyme function depends on maintaining a specific three-dimensional shape.

Question 20

Which of the following is NOT a type of reversible inhibition?

Accepted Answer

Irreversible inhibition

Enzyme Activity and Inhibition: Temperature, pH, and Regulatory Mechanisms

Study Guide - Practice Questions