Exam (elaborations)
BIO 121 Exam 1 Practice Questions 2024
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BIO 121 Exam 1 Practice Questions 2024
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Consider the peptide shown below.1) At neutral pH, the net charge of this molecule is:
(3 points)
A) 0
B) +1
C) -1
D) +2
E) -2
2) Suppose this molecule is treated with an enzyme that breaks ALL of the peptide bonds
(i.e. all of the peptide bonds are broken by hydrolysis). How many distinct molecules will
be produced?
(3 points)
A) 2
B) 3
C) 4
D) 5
E) 6
2
, 3) A certain enzyme E converts substrate S to product P. A certain compound I1 is a
competitive inhibitor of E, and another compound I2 is a non-competitive inhibitor of E.
The two inhibitors I1 and I2 bind E independently, i.e. binding of either inhibitor to E
does not affect the ability of the other inhibitor to bind. A plot of initial velocity versus
concentration of S for enzyme E, in the absence of any inhibitor, is shown below.
2
1.8
1.6
1.4
micromolar/sec
1.2
1
0.8
0.6
0.4
0.2
0
0 2 4 6 8 10 12 14 16 18 20
[S] micromolar
Suppose the experiments that produced the above curve were repeated but this time
the reactions contain both I1 and I2. Which of the dashed curves in the figure below
best represents the curve that will be measured?
(4 points)
A) i
B) ii
C) iii
D) iv
E) v
2
1.8
1.6 i
1.4
1.2
micromolar/sec
1
ii
0.8
0.6 iii iv
0.4 v
0.2
0
0 2 4 6 8 10 12 14 16 18 20 3
[S] (micromolar)
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