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

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Question 1 of 6

Biology

1. What is TRUE about enzymes?

 

They lower the activation energy of a reaction

They make biochemical reactions to proceed spontaneously

They are needed in large quantities

They are not very specific in their choice of substrates

Question 1 of 6

Question 2 of 6

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

C

D

B

A

Question 2 of 6

Question 3 of 6

3. Prosthetic groups are;

Proteins in nature

Required by all enzymes

Loosely attached with enzymes

Tightly bound to enzyme

Question 3 of 6

Question 4 of 6

4. What is TRUE about cofactors?

 

Help facilitate enzyme activity

Are composed of proteins

Break hydrogen bonds in proteins

Increase activation energy

Question 4 of 6

Question 5 of 6

5. To what category of molecules do enzymes belong?

 

Lipids

Nucleic acids

Proteins

Carbohydrates

Question 5 of 6

Question 6 of 6

6. 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

All active site have been occupied by substrate molecules

More substrate has disturbed the pH of the medium

The enzyme molecules have denatured

Question 6 of 6

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