enzyme activity

Question 1

The active site of an enzyme differs from an antibody-antigen binding site in that the enzyme active site ______?

Answer 1

catalyzes a chemical reaction.

Question 2

The graph below shows the rate of an enzyme-controlled reaction compared to the concentration of substrates. Why does the graph plateau?

Answer 2

There are no available enzymes to bind to more substrates, so the rate of reaction has reached its maximum.

Question 3

Which of the factors does NOT affect enzymatic activity?

Answer 3

color

Question 4

What happens when an enzyme changes shape?

Answer 4

reaction slow down

Question 5

What is it called when an enzyme’s shape is changed?

Answer 5

denature

Question 6

The pH at which an enzyme is most efficient is called the _________ pH of an enzyme.

Answer 6

optimum

Question 7

Sucrase has an optimum temperature of 37°C and an optimum pH of 6.2. What would happen if the pH changed to 3?

Answer 7

The reaction sucrase catalyzes would slow down

Question 8

Enzyme A digests proteins in the stomach (environment with a pH of 2). Enzyme B digests proteins in the small intestine (environment with a pH of 8). Which of the following is NOT true?

a. Enzyme A works best in acidic conditions.
b. Enzyme A helps in the hydrolysis of proteins.
c. Enzyme A can also work in the small intestine.
d . Enzyme A would be denatured in the small intestine.

Answer 8

enzyme A can also work at small intestine

Question 9

Which of these is NOT true?
A. Extreme pH can denature enzymes.
B. Enzymes speed up chemical reactions.
C. Enzymes can only be used once in a chemical reaction.
D. Enzymes can denature (change shape) when the temperature gets too high.

Answer 9

C.

Question 10

Which of these can destroy or permanently deactivate an enzyme?
a. Poison
b. High Acidity
c. Extreme Temperature
d. All of the Above

Answer 10

D. all of the above

Question 11

The main reason why rate of enzyme action increases with temperature initially is?

Answer 11

The kinetic energy of enzymes and substrates increases

Question 12

Which of the factors does NOT affect enzymatic activity?
A. Color
C. pH
B. Concentration
D. Temperature

Answer 12

A. Color

Question 13

Enzymes need certain environmental conditions in order to function properly. What happens when enzymes are heated to a high temperature?

Answer 13

Denature

Question 14

Each enzyme only has 1 substrate that will fit its active site. What is this called?

Answer 14

enzyme specificity

Question 15

How do enzymes speed up chemical reaction?

Answer 15

decreasing the activation energy

Question 16

Some people cannot digest milk products because they lack a specific enzyme. Which enzyme would be used to break down the lactose in milk?

Answer 16

LACTASE

Question 17

The part of the enzyme where the substrate binds is called the:

Answer 17

active site