Which of the following is (are) active enzyme(s)? a) pepsinogen b) proelastase c

Question

Which of the following is (are) active enzyme(s)?

a) pepsinogen

b) proelastase

c) trypsin

d) all are active enzymes

21000 molecules were acted on by a single molecule of an enzyme in 15 minutes. What is the turnover number?

a) 23

b) 84000

c) 1400

d) 480

Enzyme concentration has what effect on the rate of an enzyme catalyzed reaction?

a) increases

b ) decreases

c ) no effect

d) increases until reaching a maximum

a) induced enzymes
b) proenzym
c) allosteric enzymes
d) controlled enzymes

a)substrate concentration
b)enzyme concentration
c) pH
d) temperature

A zymogen is correctly classified as (Points : 1) a) an organic cofactor for an enzyme
b) an inorganic cofactor for an enzyme
c) a coenzyme
d) an inactive form of an enzyme Enzymes which are affected by the binding of modulators are called

a) induced enzymes
b) proenzym
c) allosteric enzymes
d) controlled enzymes

When enzyme activity is graphed versus the following, which graph is a straight line? (Points : 1)

a)substrate concentration
b)enzyme concentration
c) pH
d) temperature

Explanation / Answer

1. Trypsin. Others are zymogens( inactive precursors of the active enzymes)

2. (21000/15 min) = 1400 min-1     (Turnover number : Number of molecules of substrate acted on by one                molecule of the enzyme per minute.)

3. Rate of the reaction generally increases with the increases in concentration of an enzyme.

Ans: a

4. ans: d) an inactive form of an enzyme

5. c) allosteric enzyme

6. b) enzyme concentration

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