Biology Chapter 3 Enzymes Mcqs Test Online 11th Class Punjab

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Question 1 of 13

Biology

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

Allosteric site

Regulation site

Active site

Passive site

Question 1 of 13

Question 2 of 13

2. The specificity of enzyme is due to their:

High molecular weight

Hydrogen bonding

Surface configuration

pH

Question 2 of 13

Question 3 of 13

3. Erypsin is an example of?

Lipases

Nucleases

Carbohydrates

Proteases

Question 3 of 13

Question 4 of 13

4. Many enzymes are secreted in inactive form to protect

Cell proteins

Mitochondria

Cell DNA

Cell membrane

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

B

C

A

D

Question 6 of 13

Question 7 of 13

7. Combination of apoenzyme and coenzyme produces:

Isoenzyme

Enzyme

Prosthetic group

Holoenzyme

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

A

D

C

B

Question 8 of 13

Question 9 of 13

9. Non-competitive inhibitors react with enzymes at:

Both a and b

None of these

Active site

Allosteric site

Question 9 of 13

Question 10 of 13

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

By shifting the point of equilibrium of the reaction

By increasing the rate of random collisions or molecules

By bringing the reacting molecules into precise orientation

By supplying the energy required to start the reaction

Question 10 of 13

Question 11 of 13

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

Modify a substrate

Occupy an active site

Combine with prosthetic group

Activate an operator gene

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?

Allosteric inhibitors

Competitive inhibitor

Cofactors

Coenzyme

Question 12 of 13

Question 13 of 13

13. Ribozymes consist of:

Only protein

Only RNA

Protein + none protein part

None of these

Question 13 of 13

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