Biology Chapter 3 Enzymes Mcqs Test Online 11th Class Punjab

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Question 1 of 13

Biology

1. A essential feature of a competitive inhibitor is its ability to:

Activate an operator gene

Occupy an active site

Modify a substrate

Combine with prosthetic group

Question 1 of 13

Question 2 of 13

2. The catalytic activity of an enzyme is restricted to its small portion called:

Regulation site

Allosteric site

Passive site

Active site

Question 2 of 13

Question 3 of 13

3. The specificity of enzyme is due to their:

Surface configuration

Hydrogen bonding

pH

High molecular weight

Question 3 of 13

Question 4 of 13

4. The reaction rate of salivary amylase with starch decreases as the concentration of chloride ions is reduced. Which of the following describe the role of the chloride ions?

Coenzyme

Allosteric inhibitors

Cofactors

Competitive inhibitor

Question 4 of 13

Question 5 of 13

5. Many enzymes are secreted in inactive form to protect

Cell proteins

Mitochondria

Cell membrane

Cell DNA

Question 5 of 13

Question 6 of 13

6. How does an enzyme increase the rate of a reaction?

By supplying the energy required to start the reaction

By shifting the point of equilibrium of the reaction

By bringing the reacting molecules into precise orientation

By increasing the rate of random collisions or molecules

Question 6 of 13

Question 7 of 13

7. Ribozymes consist of:

Only RNA

Only protein

Protein + none protein part

None of these

Question 7 of 13

Question 8 of 13

8. The graph shows the effect of an enzyme on a reaction.

Which combination identifies X, Y and Z?

X                                                  Y                          Z

A	Catalyzed reaction	Uncatalyzed reaction	Activation energy
B	Catalyzed reaction	Uncatalyzed reaction	Energy lost during reaction
C	Uncatalyzed reaction	Catalyzed reaction	Energy gained by product
D	Uncatalyzed reaction	Catalyzed reaction	Overall energy change

D

B

A

C

Question 8 of 13

Question 9 of 13

9. Which of the following has a coenzyme activity?

None of these

Ca‘ ’

Both “a” and “b”

NAD’

Question 9 of 13

Question 10 of 13

10. Which graph shows the expected relationship between enzyme activity and substrate concentration?

A

D

B

C

Question 10 of 13

Question 11 of 13

11. Erypsin is an example of?

Carbohydrates

Lipases

Proteases

Nucleases

Question 11 of 13

Question 12 of 13

12. Combination of apoenzyme and coenzyme produces:

Holoenzyme

Isoenzyme

Enzyme

Prosthetic group

Question 12 of 13

Question 13 of 13

13. Non-competitive inhibitors react with enzymes at:

Active site

Both a and b

None of these

Allosteric site

Question 13 of 13

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