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Home
‣
Biochemical Engineering
‣
Enzymes and Kinetics
Comments
Question
Which category of enzymes belongs to class 5 in the international classification?
Options
A. Hydrolases
B. Isomerases
C. Oxido-reductases
D. Cyclase
Correct Answer
Isomerases
Enzymes and Kinetics problems
Search Results
1. The ratio of the amount of a protein present in a sample, which is used as a measure of purification, is known as
Options
A. specific activity
B. relative activity
C. purity ratio
D. all of these
Show Answer
Scratch Pad
Discuss
Correct Answer: specific activity
2. Which of the following step is assumed to be the slowest step in the Michaelis Menten equation?
Options
A. The substrate consuming step
B. The product releasing step
C. Formation of enzyme substrate complex
D. None of these
Show Answer
Scratch Pad
Discuss
Correct Answer: The product releasing step
3. If a reaction occurs in the absence of inhibitor with rate ?
0
and in the presence of inhibitor with rate ?
i
, the degree of inhibition is defined as
Options
A. (?
0
- ?
i
)/?
0
B. (?
0
+ ?
i
)/?
0
C. (?
0
?
i
)/?
0
D. (?
0
-?
i
)/?
i
Show Answer
Scratch Pad
Discuss
Correct Answer: (?
0
- ?
i
)/?
0
4. When an enzyme is functioning at V
max
, the rate of the reaction is limited by
Options
A. the number of collisions between enzyme and substrate
B. the number of substrate molecules in the reaction
C. the concentration of the substrate
D. the rate at which the enzyme can convert substrate to product
Show Answer
Scratch Pad
Discuss
Correct Answer: the rate at which the enzyme can convert substrate to product
5. The usual method(s) to solve rate equation of simple enzyme kinetics is/are
Options
A. Michaelis Menten approach
B. Briggs-Haldane approach
C. Numerical solution approach
D. all of these
Show Answer
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Discuss
Correct Answer: all of these
6. Predominantly uncompetitive inhibition may be called when
Options
A. competitive inhibition is greater than uncompetitive inhibition
B. competitive inhibition is smaller than uncompetitive inhibition
C. competitive inhibition is equal to uncompetitive inhibition
D. none of the above
Show Answer
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Discuss
Correct Answer: competitive inhibition is greater than uncompetitive inhibition
7. When substrate [S] = K
M
(Michaelis-Menten constant), the velocity of an enzyme catalyzed reaction is about
Options
A. 0.1 * V
max
B. 0.2 * V
max
C. 0.5 * V
max
D. 0.9 * V
max
Show Answer
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Discuss
Correct Answer: 0.5 * V
max
8. A classical noncompetitive inhibitor has
Options
A. no effect on substrate binding
B. no effect on substrate binding and vice versa
C. significant effect on substrate binding
D. significant effect on substrate binding and vice versa
Show Answer
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Discuss
Correct Answer: no effect on substrate binding and vice versa
9. The rate equation in non-competitive inhibition based on Michaelis Menten equation is given by
Options
A. r
max
S
/(
K
m
+
S
)(1+
I
/
K
i
)
B. r
max
E
/(
K
m
(1+
I
/
K
i
)+
S
))
C. V
max
S
/(
K
m
+
S
)(1+
I
/
K
i
)
D. r
max
S
/
K
m
Show Answer
Scratch Pad
Discuss
Correct Answer: r
max
S
/(
K
m
+
S
)(1+
I
/
K
i
)
10. The initial velocity, V
0
, of an enzyme catalyzed reaction reaches V
max
as
Options
A. [S] = K
M
B. [S] = 10 * K
M
C. 1/[S] = 1/K
M
D. 1/[S] ? 0
Show Answer
Scratch Pad
Discuss
Correct Answer: 1/[S] ? 0
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