Biology Chapter 3 Enzymes Mcqs Test Online 11th Class Punjab

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Question 1 of 13

Biology

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

By shifting the point of equilibrium of the reaction

By bringing the reacting molecules into precise orientation

By supplying the energy required to start the reaction

By increasing the rate of random collisions or molecules

Question 1 of 13

Question 2 of 13

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

Occupy an active site

Modify a substrate

Combine with prosthetic group

Activate an operator gene

Question 2 of 13

Question 3 of 13

3. 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

C

A

B

D

Question 3 of 13

Question 4 of 13

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

Passive site

Active site

Regulation site

Allosteric site

Question 4 of 13

Question 5 of 13

5. Which of the following has a coenzyme activity?

NAD’

Ca‘ ’

Both “a” and “b”

None of these

Question 5 of 13

Question 6 of 13

6. Erypsin is an example of?

Lipases

Proteases

Carbohydrates

Nucleases

Question 6 of 13

Question 7 of 13

7. Many enzymes are secreted in inactive form to protect

Cell membrane

Cell proteins

Cell DNA

Mitochondria

Question 7 of 13

Question 8 of 13

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

A

B

D

C

Question 8 of 13

Question 9 of 13

9. The specificity of enzyme is due to their:

High molecular weight

Surface configuration

Hydrogen bonding

pH

Question 9 of 13

Question 10 of 13

10. Combination of apoenzyme and coenzyme produces:

Enzyme

Holoenzyme

Prosthetic group

Isoenzyme

Question 10 of 13

Question 11 of 13

11. Ribozymes consist of:

Protein + none protein part

Only RNA

None of these

Only protein

Question 11 of 13

Question 12 of 13

12. 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?

Cofactors

Coenzyme

Allosteric inhibitors

Competitive inhibitor

Question 12 of 13

Question 13 of 13

13. Non-competitive inhibitors react with enzymes at:

Allosteric site

Active site

Both a and b

None of these

Question 13 of 13

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