Biology Chapter 3 Enzymes Mcqs Test Online 11th Class Punjab

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Question 1 of 13

Biology

1. 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

Coenzyme

Allosteric inhibitors

Cofactors

Question 1 of 13

Question 2 of 13

2. 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 2 of 13

Question 3 of 13

3. Erypsin is an example of?

Nucleases

Lipases

Carbohydrates

Proteases

Question 3 of 13

Question 4 of 13

4. Ribozymes consist of:

Protein + none protein part

None of these

Only protein

Only RNA

Question 4 of 13

Question 5 of 13

5. Many enzymes are secreted in inactive form to protect

Mitochondria

Cell membrane

Cell proteins

Cell DNA

Question 5 of 13

Question 6 of 13

6. Which of the following has a coenzyme activity?

NAD’

Ca‘ ’

None of these

Both “a” and “b”

Question 6 of 13

Question 7 of 13

7. Combination of apoenzyme and coenzyme produces:

Enzyme

Prosthetic group

Isoenzyme

Holoenzyme

Question 7 of 13

Question 8 of 13

8. The specificity of enzyme is due to their:

High molecular weight

Hydrogen bonding

pH

Surface configuration

Question 8 of 13

Question 9 of 13

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

Passive site

Regulation site

Active site

Allosteric site

Question 9 of 13

Question 10 of 13

10. 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

B

C

D

A

Question 10 of 13

Question 11 of 13

11. Non-competitive inhibitors react with enzymes at:

Allosteric site

None of these

Active site

Both a and b

Question 11 of 13

Question 12 of 13

12. 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 bringing the reacting molecules into precise orientation

By shifting the point of equilibrium of the reaction

Question 12 of 13

Question 13 of 13

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

B

C

D

A

Question 13 of 13

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