Biochemistry 451 Exam 1 Past Questions well
answered 2025 updated
With respect to decarboxylation of pyruvate:
a. it can work non-oxidatively in yeast
b. FADH2 and NADH are required
c. lipoamide is required for reduction of acetaldehyde
d. it produces acetyl-CoA when there is no NAD+
e. all of the above are true
d. none of the above are true - correct answer ✔✔a. it can work non oxidatively in
yeast
With respect to fermentation in yeast:
a. acetaldehyde gets oxidized
b. NAD+ is used making ethanol
c. NADH is produced in making ethanol
d. all of the above are true
e. none of the above are true - correct answer ✔✔e. none of the above are true
With respect to the Citric Acid Cycle:
, a. it can produce and use CO2 in the forward direction
b. it occurs in the mitochondrion
c. each turn of the cycle directly produces one GDP
d. all of the above are true
e. none of the above are true - correct answer ✔✔b. it occurs in the
mitochondrion
With respect to the second decarboxylation of the citric acid cycle:
a. it produces NAD+
b. it is oxidative in all organisms
c. it is catalyzed by isocitrate dehydrogenase
d. all of the above are true
e. none of the above are true - correct answer ✔✔b. it is oxidative in all organisms
With respect to the enzymes of the citric acid cycle:
a. citrate synthase catalyzes an oxidation that is energetically favorable
b. isocitrate dehydrogenase requires 5 coenzymes
c. citrate synthase catalyzes conversion of citrate to isocitrate
d. they are mostly activated when NADH is abundant
e. all of the above are true
f. none of the above are true - correct answer ✔✔a. citrate synthase catalyzes an
oxidation that is energetically favorable
answered 2025 updated
With respect to decarboxylation of pyruvate:
a. it can work non-oxidatively in yeast
b. FADH2 and NADH are required
c. lipoamide is required for reduction of acetaldehyde
d. it produces acetyl-CoA when there is no NAD+
e. all of the above are true
d. none of the above are true - correct answer ✔✔a. it can work non oxidatively in
yeast
With respect to fermentation in yeast:
a. acetaldehyde gets oxidized
b. NAD+ is used making ethanol
c. NADH is produced in making ethanol
d. all of the above are true
e. none of the above are true - correct answer ✔✔e. none of the above are true
With respect to the Citric Acid Cycle:
, a. it can produce and use CO2 in the forward direction
b. it occurs in the mitochondrion
c. each turn of the cycle directly produces one GDP
d. all of the above are true
e. none of the above are true - correct answer ✔✔b. it occurs in the
mitochondrion
With respect to the second decarboxylation of the citric acid cycle:
a. it produces NAD+
b. it is oxidative in all organisms
c. it is catalyzed by isocitrate dehydrogenase
d. all of the above are true
e. none of the above are true - correct answer ✔✔b. it is oxidative in all organisms
With respect to the enzymes of the citric acid cycle:
a. citrate synthase catalyzes an oxidation that is energetically favorable
b. isocitrate dehydrogenase requires 5 coenzymes
c. citrate synthase catalyzes conversion of citrate to isocitrate
d. they are mostly activated when NADH is abundant
e. all of the above are true
f. none of the above are true - correct answer ✔✔a. citrate synthase catalyzes an
oxidation that is energetically favorable
