Biology 9th Chap 7 : Topic 5 - Maryam Publications

Biology Chapter 7 : Topic 5

Enzyme Inhibition

1 / 15

What is enzyme inhibition?

A) Increase in enzyme production

B) Blocking or reducing enzyme activity by a substance

C) Conversion of enzyme into substrate

D) Formation of new enzymes

2 / 15

In competitive inhibition, the inhibitor:

A) Binds to DNA

B) Produces energy

C) Breaks the enzyme

D) Competes with substrate for the active site

3 / 15

A competitive inhibitor works by:

A) Blocking the active site

B) Binding permanently to the enzyme

C) Destroying substrate molecules

D) Increasing enzyme size

4 / 15

Which factor can reduce the effect of competitive inhibition?

A) Increasing substrate concentration

B) Lowering pH

C) Increasing inhibitor concentration

D) Decreasing temperature

5 / 15

In non-competitive inhibition, the inhibitor:

A) Binds to a site other than the active site

B) Competes with substrate

C) Binds only to the active site

D) Acts as a substrate

6 / 15

Non-competitive inhibition affects enzyme activity by:

A) Producing more enzymes

B) Changing the shape of the enzyme

C) Increasing temperature

D) Increasing substrate binding

7 / 15

Which type of inhibition is reversible by increasing substrate concentration?

A) Competitive inhibition

B) Denaturation

C) Irreversible inhibition

D) Non-competitive inhibition

8 / 15

Non-competitive inhibitors bind to:

A) Substrate only

B) DNA

C) Allosteric site

D) Active site

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 always binds to the active site

B) It can be overcome by increasing substrate concentration

C) It increases reaction rate

D) It reduces enzyme activity by changing enzyme shape

11 / 15

A competitive inhibitor is most similar in structure to:

A) DNA

B) Enzyme

C) Substrate

D) Product

12 / 15

What is the main effect of enzyme inhibition?

A) Produces energy

B) Slows down or blocks enzyme activity

C) Stops enzyme completely always

D) Increases reaction rate

13 / 15

Which type of inhibition changes enzyme structure?

A) Substrate binding

B) Non-competitive

C) Activation

D) Competitive

14 / 15

In competitive inhibition, the active site is:

A) Converted into product

B) Permanently destroyed

C) Temporarily occupied by inhibitor

D) Removed from enzyme

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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