Textbook Question
Where does the citric acid cycle occur in eukaryotes?a. in the cytosol of cellsb. in the intermembrane space of mitochondriac. in the inner membrane of mitochondriad. in the matrix of mitochondria
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3. Energy & Cell Processes
Krebs Cycle
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Which product of the Krebs cycle is also used as a reactant in the Krebs cycle?
A
Citrate.
B
ATP.
C
Acetyl-CoA.
D
Oxaloacetate.
Verified step by step guidance1
Understand the Krebs cycle: The Krebs cycle, also known as the citric acid cycle, 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 components: The cycle begins with the combination of acetyl-CoA and oxaloacetate to form citrate. This is followed by a series of reactions that regenerate oxaloacetate, allowing the cycle to continue.
Recognize the role of oxaloacetate: Oxaloacetate is both a product and a reactant in the Krebs cycle. It is regenerated at the end of the cycle and is used to combine with a new acetyl-CoA molecule to start the cycle again.
Differentiate between products and reactants: While ATP is a product of the Krebs cycle, it is not used as a reactant in the cycle itself. Acetyl-CoA is a reactant but not a product of the cycle.
Conclude with the correct answer: Oxaloacetate is the correct answer as it is both a product and a reactant in the Krebs cycle, allowing the cycle to perpetuate.
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