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 - ANSWER 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 - ANSWER 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 - ANSWER 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 - ANSWER 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 - ANSWER 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 - ANSWER 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
c. beta-globulin
d. gamma-globulin
e fibrinogen - ANSWER a. albumin
Which lipoprotein fraction has the largest size and the lowest density and acts
primarily as a carrier of triacylglycerol compounds?
a. high density lipoproteins
b. intermediate density lipoproteins
c. low density lipoproteins
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 - ANSWER 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 - ANSWER 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 - ANSWER 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 - ANSWER 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 - ANSWER 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 - ANSWER 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
c. beta-globulin
d. gamma-globulin
e fibrinogen - ANSWER a. albumin
Which lipoprotein fraction has the largest size and the lowest density and acts
primarily as a carrier of triacylglycerol compounds?
a. high density lipoproteins
b. intermediate density lipoproteins
c. low density lipoproteins
