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Home
‣
Biochemical Engineering
‣
Enzymes and Kinetics
Comments
Question
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
Correct Answer
the rate at which the enzyme can convert substrate to product
Enzymes and Kinetics problems
Search Results
1. 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
2. For an enzyme that displays Michaelis-Menten kinetics, the reaction velocity (as a fraction of V
max
) observed at [S] = 2 K
M
will be
Options
A. 0.09
B. 0.33
C. 0.66
D. 0.91
Show Answer
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Discuss
Correct Answer: 0.66
3. An enzyme has a K
m
of 4.7 x 10
-5
M. If the V
max
of the preparation is 22m moles liter
-1
min
-1
, what velocity would be observed in the presence of 2.0 x 10
-4
M substrate and 5.0 x 10
-5
M of a competitive inhibitor?
Options
A. 13.54? moles liter
-1
min
-1
B. 6.68? moles liter
-1
min
-1
C. 7.57? moles liter
-1
min
-1
D. 17.8? moles liter
-1
min
-1
Show Answer
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Discuss
Correct Answer: 13.54? moles liter
-1
min
-1
4. The slope of Lineweaver Burk plot for Michaelis Menten equation is
Options
A. V
max
/
K
m
B.
K
m
/V
max
C. 1/
K
m
D.
K
m
.V
max
Show Answer
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Discuss
Correct Answer:
K
m
/V
max
5. Which of the following statement(s) regarding enzymes, is/are false?
Options
A. Enzymes are always proteins that function as catalysts
B. Enzymes provide activation energy for reactions
C. Enzyme activity can be regulated
D. Enzymes may be used many times for a specific reaction
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Discuss
Correct Answer: Enzymes provide activation energy for reactions
6. 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
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Discuss
Correct Answer: (?
0
- ?
i
)/?
0
7. 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
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Discuss
Correct Answer: The product releasing step
8. 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
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Correct Answer: specific activity
9. Which category of enzymes belongs to class 5 in the international classification?
Options
A. Hydrolases
B. Isomerases
C. Oxido-reductases
D. Cyclase
Show Answer
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Discuss
Correct Answer: Isomerases
10. 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
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