Biology Chapter 3 Enzymes Mcqs Test Online 11th Class Punjab

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Question 1 of 13

Biology

1. Many enzymes are secreted in inactive form to protect

Cell membrane

Cell DNA

Mitochondria

Cell proteins

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?

Coenzyme

Cofactors

Allosteric inhibitors

Competitive inhibitor

Question 2 of 13

Question 3 of 13

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

Regulation site

Allosteric site

Active site

Passive site

Question 3 of 13

Question 4 of 13

4. The specificity of enzyme is due to their:

pH

High molecular weight

Hydrogen bonding

Surface configuration

Question 4 of 13

Question 5 of 13

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

Activate an operator gene

Combine with prosthetic group

Modify a substrate

Occupy an active site

Question 5 of 13

Question 6 of 13

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

D

B

A

C

Question 6 of 13

Question 7 of 13

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

By supplying the energy required to start the reaction

By increasing the rate of random collisions or molecules

By shifting the point of equilibrium of the reaction

By bringing the reacting molecules into precise orientation

Question 7 of 13

Question 8 of 13

8. Non-competitive inhibitors react with enzymes at:

Allosteric site

Both a and b

Active site

None of these

Question 8 of 13

Question 9 of 13

9. Erypsin is an example of?

Nucleases

Lipases

Carbohydrates

Proteases

Question 9 of 13

Question 10 of 13

10. Which of the following has a coenzyme activity?

NAD’

Both “a” and “b”

None of these

Ca‘ ’

Question 10 of 13

Question 11 of 13

11. 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

B

D

C

Question 11 of 13

Question 12 of 13

12. Ribozymes consist of:

Only protein

None of these

Only RNA

Protein + none protein part

Question 12 of 13

Question 13 of 13

13. Combination of apoenzyme and coenzyme produces:

Holoenzyme

Enzyme

Isoenzyme

Prosthetic group

Question 13 of 13

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