Textbook Question
Where does the citric acid cycle occur in eukaryotes?
a. in the cytosol of cells
b. in the intermembrane space of mitochondria
c. in the inner membrane of mitochondria
d. in the matrix of mitochondria
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3. Energy & Cell Processes
Krebs Cycle
Multiple Choice
Which of these is not a product of the citric acid cycle?
A
Oxygen
B
ATP
C
FADH2
D
NADH
Verified step by step guidance1
Begin by understanding the citric acid cycle, also known as the Krebs cycle, which is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats, and proteins into carbon dioxide.
Identify the main products of the citric acid cycle. These include ATP, NADH, FADH2, and carbon dioxide. These products are generated through various steps of the cycle as the acetyl-CoA is oxidized.
Recognize that oxygen is not a direct product of the citric acid cycle. Instead, oxygen is used in the electron transport chain, which occurs after the citric acid cycle, to accept electrons and form water.
Understand that ATP is produced in the citric acid cycle through substrate-level phosphorylation, specifically in the conversion of succinyl-CoA to succinate.
Note that NADH and FADH2 are produced as electron carriers during the cycle, which are later used in the electron transport chain to generate more ATP.
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