Biology 9th Chap 7 : Topic 5 - Maryam Publications

Biology Chapter 7 : Topic 5

Enzyme Inhibition

1 / 15

What is enzyme inhibition?

A) Conversion of enzyme into substrate

B) Formation of new enzymes

C) Increase in enzyme production

D) Blocking or reducing enzyme activity by a substance

2 / 15

In competitive inhibition, the inhibitor:

A) Competes with substrate for the active site

B) Produces energy

C) Breaks the enzyme

D) Binds to DNA

3 / 15

A competitive inhibitor works by:

A) Blocking the active site

B) Increasing enzyme size

C) Destroying substrate molecules

D) Binding permanently to the enzyme

4 / 15

Which factor can reduce the effect of competitive inhibition?

A) Decreasing temperature

B) Increasing substrate concentration

C) Lowering pH

D) Increasing inhibitor concentration

5 / 15

In non-competitive inhibition, the inhibitor:

A) Binds only to the active site

B) Binds to a site other than the active site

C) Competes with substrate

D) Acts as a substrate

6 / 15

Non-competitive inhibition affects enzyme activity by:

A) Increasing temperature

B) Changing the shape of the enzyme

C) Increasing substrate binding

D) Producing more enzymes

7 / 15

Which type of inhibition is reversible by increasing substrate concentration?

A) Competitive inhibition

B) Irreversible inhibition

C) Denaturation

D) Non-competitive inhibition

8 / 15

Non-competitive inhibitors bind to:

A) DNA

B) Active site

C) Allosteric site

D) Substrate only

9 / 15

Which statement best describes competitive inhibition?

A) Inhibitor increases enzyme activity

B) Inhibitor competes with substrate for active site

C) Inhibitor permanently destroys enzyme

D) Inhibitor binds to DNA

10 / 15

Which of the following is true for non-competitive inhibition?

A) It reduces enzyme activity by changing enzyme shape

B) It increases reaction rate

C) It can be overcome by increasing substrate concentration

D) It always binds to the active site

11 / 15

A competitive inhibitor is most similar in structure to:

A) DNA

B) Substrate

C) Product

D) Enzyme

12 / 15

What is the main effect of enzyme inhibition?

A) Stops enzyme completely always

B) Produces energy

C) Slows down or blocks enzyme activity

D) Increases reaction rate

13 / 15

Which type of inhibition changes enzyme structure?

A) Non-competitive

B) Activation

C) Competitive

D) Substrate binding

14 / 15

In competitive inhibition, the active site is:

A) Removed from enzyme

B) Temporarily occupied by inhibitor

C) Converted into product

D) Permanently destroyed

15 / 15

Which statement best compares both types of inhibition?

A) Both increase enzyme activity

B) Competitive binds active site; non-competitive binds elsewhere

C) Both bind only to active site

D) Both destroy enzymes permanently

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