Score: 0 / 0
Citric Acid Cycle
Overview
-
The
citric acid cycle
is the central metabolic pathway that oxidizes
acetyl-CoA
to produce CO₂, NADH, FADH₂, and GTP.
-
The cycle occurs in the
mitochondrial matrix
of eukaryotic cells.
Which of the following is not a product of the citric acid cycle? Type the letter of your answer: D
a. CO₂
b. NADH
c. FADH₂
d. ATP
Key Steps
-
Citrate synthase
combines acetyl-CoA with
oxaloacetate
to form
citrate.
-
Isocitrate dehydrogenase
is the rate-limiting step, producing the first NADH.
-
α-ketoglutarate dehydrogenase
produces the second CO₂ and NADH.
Which enzyme is the rate-limiting step in the citric acid cycle? Type the letter of your answer: A
a. Isocitrate dehydrogenase
b. Citrate synthase
c. Alpha-ketoglutarate dehydrogenase
d. Succinyl-CoA synthetase
Energy Yield
-
Per acetyl-CoA, there is a net yield of
3NADH, 1FADH₂,
1GTP, and 2CO₂.
Which metabolic pathway is the citric acid cycle a precursor to? Type the letter of your answer: B
a. Glycolysis
b. Oxidative phosphorylation
c. Gluconeogenesis
d. Fatty acid synthesis