Punjab 9th Class Biology Chapter 6 Enzymes Punjab 9th Class

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Question 1 of 6

Biology

1. When we add more substrate to an already occurring enzymatic reaction and there is no increase in the rate of reaction, what would you predict?

More substrate acted as inhibitor

The enzyme molecules have denatured

More substrate has disturbed the pH of the medium

All active site have been occupied by substrate molecules

Question 1 of 6

Question 2 of 6

2. Prosthetic groups are;

Loosely attached with enzymes

Required by all enzymes

Proteins in nature

Tightly bound to enzyme

Question 2 of 6

Question 3 of 6

3. What is TRUE about enzymes?

 

They are not very specific in their choice of substrates

They make biochemical reactions to proceed spontaneously

They are needed in large quantities

They lower the activation energy of a reaction

Question 3 of 6

Question 4 of 6

4. What is TRUE about cofactors?

 

Help facilitate enzyme activity

Break hydrogen bonds in proteins

Are composed of proteins

Increase activation energy

Question 4 of 6

Question 5 of 6

5. Which of these graphs correctly shows the effect of temperature on the rate of an enzyme-controlled reaction?

A

D

B

C

Question 5 of 6

Question 6 of 6

6. To what category of molecules do enzymes belong?

 

Lipids

Nucleic acids

Proteins

Carbohydrates

Question 6 of 6

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