Textbook Question
In step 3 of the citric acid cycle, the enzyme isocitrate dehydrogenase is regulated by NADH. Compare and contrast the regulation of this enzyme with the regulation of phosphofructokinase in glycolysis.
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3. Energy & Cell Processes
Krebs Cycle
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Which of these is not a product of the citric acid cycle (also called the Krebs cycle)?
A
NADH
B
ATP
C
FADH2
D
Glucose
Verified step by step guidance1
Understand the citric acid cycle: The citric acid cycle, also known as the Krebs cycle, is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.
Identify the main products of the citric acid cycle: The primary products of the citric acid cycle include NADH, FADH2, ATP (or GTP), and carbon dioxide (CO2).
Analyze each option: Review each of the given options (NADH, ATP, FADH2, and Glucose) to determine which are products of the citric acid cycle.
Recognize that glucose is not a product: Glucose is actually a substrate that is broken down during glycolysis to eventually form acetyl-CoA, which enters the citric acid cycle. It is not a product of the cycle itself.
Conclude that glucose is the correct answer: Since glucose is not produced during the citric acid cycle, it is the correct answer to the question of which is not a product of the cycle.
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