Biology Chapter 3 Enzymes Mcqs Test Online 11th Class Punjab

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Question 1 of 13

Biology

1. Which of the following has a coenzyme activity?

NAD’

None of these

Both “a” and “b”

Ca‘ ’

Question 1 of 13

Question 2 of 13

2. Non-competitive inhibitors react with enzymes at:

Allosteric site

Both a and b

None of these

Active site

Question 2 of 13

Question 3 of 13

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

Modify a substrate

Activate an operator gene

Occupy an active site

Combine with prosthetic group

Question 3 of 13

Question 4 of 13

4. 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

B

C

D

A

Question 4 of 13

Question 5 of 13

5. The specificity of enzyme is due to their:

High molecular weight

pH

Hydrogen bonding

Surface configuration

Question 5 of 13

Question 6 of 13

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

C

B

D

A

Question 6 of 13

Question 7 of 13

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

Regulation site

Passive site

Active site

Allosteric site

Question 7 of 13

Question 8 of 13

8. Ribozymes consist of:

Only RNA

Protein + none protein part

Only protein

None of these

Question 8 of 13

Question 9 of 13

9. Combination of apoenzyme and coenzyme produces:

Holoenzyme

Isoenzyme

Enzyme

Prosthetic group

Question 9 of 13

Question 10 of 13

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

By bringing the reacting molecules into precise orientation

By supplying the energy required to start the reaction

By shifting the point of equilibrium of the reaction

By increasing the rate of random collisions or molecules

Question 10 of 13

Question 11 of 13

11. 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?

Competitive inhibitor

Coenzyme

Allosteric inhibitors

Cofactors

Question 11 of 13

Question 12 of 13

12. Erypsin is an example of?

Proteases

Carbohydrates

Nucleases

Lipases

Question 12 of 13

Question 13 of 13

13. Many enzymes are secreted in inactive form to protect

Cell proteins

Mitochondria

Cell DNA

Cell membrane

Question 13 of 13

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