BIOC 3021 EXAM 2 QUESTIONS AND ANSWERS 2024/2025 | VERIFIED
If a noncompetitive inhibitor is added to an enzyme reaction then:
a. The Vmax increases and the Km decreases
b. The Vmax decreases and the Km increases
c. The Vmax stays the same and the Km decreases
d. The Vmax stays the same and the Km increases
e. The Vmax decreases and the Km stays the same - e. The Vmax decreases and the Km stays the
same
If a competitive inhibitor is added to an enzyme reaction then:
a. The Vmax increases and the Km decreases
b. The Vmax decreases and the Km increases
c. The Vmax stays the same and the Km decreases
d. The Vmax stays the same and the Km increases
e. The Vmax decreases and the Km stays the same - d. The Vmax stays the same and the Km
increases
If the substrate concentration [S] is equal to the Km of an enzyme, the reaction rate is:
a. equal to the Vmax
b. very low
c. very high
d. equal to ½ of the Vmax
e. not changed by adding more substrate - d. equal to 1/2 of the Vmax
Which pair is thought to have the tightest binding/assoc. during enzyme catalysis?
, a. substrate and enzyme
b. transition state intermediate
and enzyme
c. water and enzyme
d. product and enzyme
e. hydroxyl ions and enzyme - b. transition state intermediate and enzyme
The name of the relatively stable covalent intermediate in the chymotrypsin reaction is:
a. first tetrahedral intermediate
b. nucleophilic intermediate
c. electrophilic intermediate
d. acyl enzyme intermediate
e. second tetrahedral intermediate - d. acyl enzyme intermediate
In the catalytic triad of chymotrypsin, which amino acid R-group is the closest to the catalytic serine
residue?
a. histidine
b. alanine
c. aspartate
d. lysine
e. arginine - a. histidine
What protein fraction is present in the highest amount in the blood serum and acts as a carrier of fatty
acids?
a. albumin
b. alpha-globulin
If a noncompetitive inhibitor is added to an enzyme reaction then:
a. The Vmax increases and the Km decreases
b. The Vmax decreases and the Km increases
c. The Vmax stays the same and the Km decreases
d. The Vmax stays the same and the Km increases
e. The Vmax decreases and the Km stays the same - e. The Vmax decreases and the Km stays the
same
If a competitive inhibitor is added to an enzyme reaction then:
a. The Vmax increases and the Km decreases
b. The Vmax decreases and the Km increases
c. The Vmax stays the same and the Km decreases
d. The Vmax stays the same and the Km increases
e. The Vmax decreases and the Km stays the same - d. The Vmax stays the same and the Km
increases
If the substrate concentration [S] is equal to the Km of an enzyme, the reaction rate is:
a. equal to the Vmax
b. very low
c. very high
d. equal to ½ of the Vmax
e. not changed by adding more substrate - d. equal to 1/2 of the Vmax
Which pair is thought to have the tightest binding/assoc. during enzyme catalysis?
, a. substrate and enzyme
b. transition state intermediate
and enzyme
c. water and enzyme
d. product and enzyme
e. hydroxyl ions and enzyme - b. transition state intermediate and enzyme
The name of the relatively stable covalent intermediate in the chymotrypsin reaction is:
a. first tetrahedral intermediate
b. nucleophilic intermediate
c. electrophilic intermediate
d. acyl enzyme intermediate
e. second tetrahedral intermediate - d. acyl enzyme intermediate
In the catalytic triad of chymotrypsin, which amino acid R-group is the closest to the catalytic serine
residue?
a. histidine
b. alanine
c. aspartate
d. lysine
e. arginine - a. histidine
What protein fraction is present in the highest amount in the blood serum and acts as a carrier of fatty
acids?
a. albumin
b. alpha-globulin
