1-An enzyme that generally requires an FAD prosthetic group is called a/an _____
ID: 13125 • Letter: 1
Question
1-An enzyme that generally requires an FAD prosthetic group is called a/an___________________ when it lacks that prosthetic group.
a. holoenzyme
b. apoenzyme
c. cofactor
d. essential ion
2. Notice in question (above) that the enzyme pyruvate dehydrogenase requires
an NAD+ molecule in order to catalyze the “transition step”. Pyruvate
dehydrogenase [*Please mark all that apply.]
a. requires a prosthetic group.
b. requires a cosubstrate.
c. functions only as an apoenzyme.
d. requires a coenzyme.
3. A group of anti-fungal drugs called the nikkomycins bind to the active site
enzymes that synthesize chitin for the fungal cell wall. When these drugs are
bound to the active site of these enzymes, the enzymes’ substrates cannot bind
and chitin synthesis is inhibited. (The Journal of Antibiotics, Vol. XXXVIII No.
1).
The nikkomycins
a. are allosteric feedback inhibitors.
b. are prosthetic groups.
c. are competitive enzyme inhibitors.
d. are noncompetitive enzyme inhibitors.
4. The amino acid Ser can be synthesized from a 3-carbon molecule called
phosphoglycerate. This metabolic process is
a. anabolic
b. catabolic
c. degragatory
d. crazy
5. Which statements are TRUE? [*Mark all that apply.]
a. The complete oxidation of glucose, as shown below, is an endergonic
process.
C6H12O6 + 6O2 ? 6CO2 + 6H2O ?G = -686 kcal/mol
b. If a reaction occurs in which heat is lost and disorder increases, the
reaction is spontaneous.
c. The addition of a phosphate group to glucose (as shown below) is an
exergonic process:
glucose + phosphate ? glucose-6-phosphate + H2O ?G = 3.3 kcal/mol
d. The cellular synthesis of fatty acids by the addition of 2-carbon units to an
elongating carbon chain is an anabolic process.
6. Both NADH and FADH2
a. are reduced prosthetic groups.
b. are reduced cosubstrates.
c. carry a hydride ion.
d. deliver there electrons to the electron transport chain.
7. Which one of the following has the greatest desire for electrons?
a. NAD+
b. FAD
c. Cytochrome c
d. O2
Explanation / Answer
1-An enzyme that generally requires an FAD prosthetic group is called a/an
___________________ when it lacks that prosthetic group.
a. holoenzyme
b. apoenzyme
c. cofactor
d. essential ion
2. Notice in question (above) that the enzyme pyruvate dehydrogenase requires
an NAD+ molecule in order to catalyze the “transition step”. Pyruvate
dehydrogenase [*Please mark all that apply.]
a. requires a prosthetic group.
b. requires a cosubstrate.
c. functions only as an apoenzyme.
d. requires a coenzyme.
3. A group of anti-fungal drugs called the nikkomycins bind to the active site
enzymes that synthesize chitin for the fungal cell wall. When these drugs are
bound to the active site of these enzymes, the enzymes’ substrates cannot bind
and chitin synthesis is inhibited. (The Journal of Antibiotics, Vol. XXXVIII No.
1).
The nikkomycins
a. are allosteric feedback inhibitors.
b. are prosthetic groups.
c. are competitive enzyme inhibitors.
d. are noncompetitive enzyme inhibitors.
4. The amino acid Ser can be synthesized from a 3-carbon molecule called
phosphoglycerate. This metabolic process is
a. anabolic
b. catabolic
c. degragatory
d. crazy
5. Which statements are TRUE? [*Mark all that apply.]
a. The complete oxidation of glucose, as shown below, is an endergonic
process.
C6H12O6 + 6O2 ? 6CO2 + 6H2O ?G = -686 kcal/mol
b. If a reaction occurs in which heat is lost and disorder increases, the
reaction is spontaneous.
c. The addition of a phosphate group to glucose (as shown below) is an
exergonic process:
glucose + phosphate ? glucose-6-phosphate + H2O ?G = 3.3 kcal/mol
d. The cellular synthesis of fatty acids by the addition of 2-carbon units to an
elongating carbon chain is an anabolic process.
6. Both NADH and FADH2
a. are reduced prosthetic groups.
b. are reduced cosubstrates.
c. carry a hydride ion.
d. deliver there electrons to the electron transport chain.
7. Which one of the following has the greatest desire for electrons?
a. NAD+
b. FAD
c. Cy
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