Enzymes and Kinetics – Section 2

1. The ratio of the amount of a protein present in a sample, which is used as a measure of purification, is known as

A. specific activity
B. relative activity
C. purity ratio
D. all of these

Correct Answer: A. specific activity

2. If a reaction occurs in the absence of an inhibitor with rate ν0 and in the presence of an inhibitor with rate νi, the degree of inhibition is defined as

A. (ν0– νi)/ν0
B. (ν0+ νi)/ν0
C. (ν0νi)/ν0
D. (ν0i)/νi

Correct Answer: A. (ν0– νi)/ν0

3. The rate equation in competitive inhibition based on Michaelis Menten equation is given by

A. rmaxS/(Km (1+I/Ki)+S))
B. rmaxE/(Km (1+I/Ki)+S))
C. rmaxI/(Km (1+I/Ki)+S))
D. rmaxS/(Km (1+I/Ki))

Correct Answer: A. rmaxS/(Km (1+I/Ki)+S))

4. Classical noncompetitive inhibition is obtained only under

A. slow equilibrium conditions
B. moderate equilibrium conditions
C. rapid equilibrium conditions
D. non-equilibrium conditions

Correct Answer: C. rapid equilibrium conditions

5. In the steady state the material balance equation for any component of a system is

A. rate of addition + rate of removal – rate of formation = 0
B. rate of addition – rate of removal + rate of formation = 0
C. rate of addition + rate of removal + rate of formation = 0
D. none of the above

Correct Answer: B. rate of addition – rate of removal + rate of formation = 0

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