Biology Chapter 3 Enzymes Mcqs Test Online 11th Class Punjab

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Question 1 of 13

Biology

1. The specificity of enzyme is due to their:

pH

Hydrogen bonding

High molecular weight

Surface configuration

Question 1 of 13

Question 2 of 13

2. 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

Coenzyme

Competitive inhibitor

Cofactors

Question 2 of 13

Question 3 of 13

3. Erypsin is an example of?

Lipases

Carbohydrates

Proteases

Nucleases

Question 3 of 13

Question 4 of 13

4. Combination of apoenzyme and coenzyme produces:

Enzyme

Holoenzyme

Prosthetic group

Isoenzyme

Question 4 of 13

Question 5 of 13

5. 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 5 of 13

Question 6 of 13

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

D

A

C

B

Question 6 of 13

Question 7 of 13

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

Regulation site

Active site

Allosteric site

Passive site

Question 7 of 13

Question 8 of 13

8. Which of the following has a coenzyme activity?

None of these

NAD’

Both “a” and “b”

Ca‘ ’

Question 8 of 13

Question 9 of 13

9. 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 9 of 13

Question 10 of 13

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

Occupy an active site

Modify a substrate

Activate an operator gene

Combine with prosthetic group

Question 10 of 13

Question 11 of 13

11. Non-competitive inhibitors react with enzymes at:

Allosteric site

Both a and b

Active site

None of these

Question 11 of 13

Question 12 of 13

12. Many enzymes are secreted in inactive form to protect

Mitochondria

Cell membrane

Cell DNA

Cell proteins

Question 12 of 13

Question 13 of 13

13. Ribozymes consist of:

None of these

Only RNA

Only protein

Protein + none protein part

Question 13 of 13

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