Chapter # 6 Enzymes

Q.1 Choice the correct option (A,B,C,D) ?

1. The bio-chemical reactions in which large molecules are synthesized is called:

(a) Anabolism          (b) Catabolism          (c) Metabolism          (d) Enzymatic reaction

2. Minimum energy required to start a chemical reaction is called:

(a) Potential energy

(b) Chemical energy

(c) Activation energy

(d) All are same

3. Who used the term enzyme first time?

(a) Oscar Hertwig

(b) Winhelm Kuhne

(c) W-Flemming

(d) T. H. Morgan

4. Almost all enzymes are:

(a) Carbohydrates

(b) Fatty acids

(c) Proteins

(d) Vitamins

5. Vitamin which acts as co-enzyme is:

(a) Vitamin A

(b) Vitamin K

(c) Riboflavin

(d) All of these

6. Enzymatic reactions are________ of times faster than uncatalyzed reactions:

(a) Millions         (b) Hundreds        (c) Thousands         (d) Billion

7. An enzyme, which breaks down starch is:

(a) Protease

(b) Amylase

(c) Tripsn

(d) Lipase

8. Which enzyme works in stomach?

(a) Lipase          (b) Trypsin         (c) Pepsin         (d) Amylase

9. What is the effect of change in pH?

(a) Digradation of amino acids at active sites

(b) Ionization of amino acids at active sites

(c) Formation of new amino acids at active sites

(d) All of these

10. Prosthetic groups are:

(a) Required by all enzymes

(b) Loosely attached with enzymes

(c) Proteins in nature

(d) Tightly bound to enzyme

Q. 2(Short Questions)

Define active site.

What is activation energy?

Name the factors that affect the rate of enzyme action?

What is meant by denaturation of enzyme?

What is the difference between in-vitro and in-vivo enzyme activity?


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