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:

Modify a substrate

Activate an operator gene

Combine with prosthetic group

Occupy an active site

Question 1 of 13

Question 2 of 13

2. Combination of apoenzyme and coenzyme produces:

Isoenzyme

Enzyme

Holoenzyme

Prosthetic group

Question 2 of 13

Question 3 of 13

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

A

D

B

C

Question 3 of 13

Question 4 of 13

4. 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 4 of 13

Question 5 of 13

5. The specificity of enzyme is due to their:

Surface configuration

pH

Hydrogen bonding

High molecular weight

Question 5 of 13

Question 6 of 13

6. 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

C

B

A

Question 6 of 13

Question 7 of 13

7. Ribozymes consist of:

Protein + none protein part

Only RNA

None of these

Only protein

Question 7 of 13

Question 8 of 13

8. 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

Allosteric inhibitors

Coenzyme

Cofactors

Question 8 of 13

Question 9 of 13

9. Which of the following has a coenzyme activity?

None of these

NAD’

Ca‘ ’

Both “a” and “b”

Question 9 of 13

Question 10 of 13

10. Non-competitive inhibitors react with enzymes at:

Both a and b

Active site

Allosteric site

None of these

Question 10 of 13

Question 11 of 13

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

Regulation site

Active site

Allosteric site

Passive site

Question 11 of 13

Question 12 of 13

12. Many enzymes are secreted in inactive form to protect

Cell DNA

Cell membrane

Mitochondria

Cell proteins

Question 12 of 13

Question 13 of 13

13. Erypsin is an example of?

Lipases

Proteases

Carbohydrates

Nucleases

Question 13 of 13

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