BCH EXAM 3 LATEST QUESTIONS AND ANSWERS
The major pathways for fuel metabolism in mammals converge on the molecules - CORRECT
ANSWER✅✅✅pyruvate and acetyl-CoA
The reaction that is catalyzed by pyruvate carboxylase is an example of an ______ reaction because it
replenishes the citric acid cycle intermediates that have been siphoned off for biosynthesis. - CORRECT
ANSWER✅✅✅anaplerotic
What metabolic conversion is considered to be the major control point of glycolysis? - CORRECT
ANSWER✅✅✅Fructose-6-phosphate → fructose-1,6-bisphosphate
What enzyme of the citric acid cycle contains an FAD prosthetic group? - CORRECT
ANSWER✅✅✅succinate dehydrogenase
Consider the following metabolic reaction:
Succinyl-CoA + Acetoacetate → Acetoacetyl-CoA + Succinate
ΔG°' = -1.25 kJ/mol
This reaction is: - CORRECT ANSWER✅✅✅favorable under standard conditions
How many electrons can be carried by the prosthetic group in cytochrome? - CORRECT
ANSWER✅✅✅1
For every 2 electrons transported through Complexes I and III, ______ protons are generated per
complex. - CORRECT ANSWER✅✅✅4
What is the metabolic intermediate that condenses with oxaloacetate to form citrate? - CORRECT
ANSWER✅✅✅acetyl-coA
Which mechanism for degrading cellular proteins involves a barrel-shaped protein complex? - CORRECT
ANSWER✅✅✅proteasome
, Which of the following are true statements about the structure of ATP synthase?
A) It has a membrane-embedded component called Fo. B) The γ subunit acts as a drive shaft in the
rotational motor.
C) The structure has an F1 component found in the intermembrane space. - CORRECT
ANSWER✅✅✅A and B
Vitamins are: - CORRECT ANSWER✅✅✅essential organic molecules humans are usually unable to
synthesize
How many NADH are produced when one acetyl group is oxidized in the citric acid cycle? - CORRECT
ANSWER✅✅✅3
Which is the net equation of glycolysis as it occurs in aerobic cells such as brain cells? - CORRECT
ANSWER✅✅✅Glucose + 2 ADP + 2 Pi + 2 NAD+→ 2 pyruvate + 2 ATP + 2 NADH + 4 H+
What enzyme is involved in substrate level phosphorylation in glycolysis? - CORRECT
ANSWER✅✅✅pyruvate kinase
The coenzyme ______ is the oxidizing agent in glycolysis. - CORRECT ANSWER✅✅✅NAD+
Biomolecules are synthesized from simpler components in ______ pathways. - CORRECT
ANSWER✅✅✅anabolic
Complex II of the electron transport chain collects electrons from _____ . - CORRECT
ANSWER✅✅✅FADH2
Which of the following enzymes catalyzes the transfer of a phosphoryl group from ATP to glucose? -
CORRECT ANSWER✅✅✅hexokinase
Complex III of the electron transport chain passes electrons directly to ________ . - CORRECT
ANSWER✅✅✅cytochrome c
The major pathways for fuel metabolism in mammals converge on the molecules - CORRECT
ANSWER✅✅✅pyruvate and acetyl-CoA
The reaction that is catalyzed by pyruvate carboxylase is an example of an ______ reaction because it
replenishes the citric acid cycle intermediates that have been siphoned off for biosynthesis. - CORRECT
ANSWER✅✅✅anaplerotic
What metabolic conversion is considered to be the major control point of glycolysis? - CORRECT
ANSWER✅✅✅Fructose-6-phosphate → fructose-1,6-bisphosphate
What enzyme of the citric acid cycle contains an FAD prosthetic group? - CORRECT
ANSWER✅✅✅succinate dehydrogenase
Consider the following metabolic reaction:
Succinyl-CoA + Acetoacetate → Acetoacetyl-CoA + Succinate
ΔG°' = -1.25 kJ/mol
This reaction is: - CORRECT ANSWER✅✅✅favorable under standard conditions
How many electrons can be carried by the prosthetic group in cytochrome? - CORRECT
ANSWER✅✅✅1
For every 2 electrons transported through Complexes I and III, ______ protons are generated per
complex. - CORRECT ANSWER✅✅✅4
What is the metabolic intermediate that condenses with oxaloacetate to form citrate? - CORRECT
ANSWER✅✅✅acetyl-coA
Which mechanism for degrading cellular proteins involves a barrel-shaped protein complex? - CORRECT
ANSWER✅✅✅proteasome
, Which of the following are true statements about the structure of ATP synthase?
A) It has a membrane-embedded component called Fo. B) The γ subunit acts as a drive shaft in the
rotational motor.
C) The structure has an F1 component found in the intermembrane space. - CORRECT
ANSWER✅✅✅A and B
Vitamins are: - CORRECT ANSWER✅✅✅essential organic molecules humans are usually unable to
synthesize
How many NADH are produced when one acetyl group is oxidized in the citric acid cycle? - CORRECT
ANSWER✅✅✅3
Which is the net equation of glycolysis as it occurs in aerobic cells such as brain cells? - CORRECT
ANSWER✅✅✅Glucose + 2 ADP + 2 Pi + 2 NAD+→ 2 pyruvate + 2 ATP + 2 NADH + 4 H+
What enzyme is involved in substrate level phosphorylation in glycolysis? - CORRECT
ANSWER✅✅✅pyruvate kinase
The coenzyme ______ is the oxidizing agent in glycolysis. - CORRECT ANSWER✅✅✅NAD+
Biomolecules are synthesized from simpler components in ______ pathways. - CORRECT
ANSWER✅✅✅anabolic
Complex II of the electron transport chain collects electrons from _____ . - CORRECT
ANSWER✅✅✅FADH2
Which of the following enzymes catalyzes the transfer of a phosphoryl group from ATP to glucose? -
CORRECT ANSWER✅✅✅hexokinase
Complex III of the electron transport chain passes electrons directly to ________ . - CORRECT
ANSWER✅✅✅cytochrome c
