Where does the Krebs cycle take place?

Study for the Manor Preboards Module 2 Test. Use flashcards and multiple choice questions that include hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

Where does the Krebs cycle take place?

Explanation:
The Krebs cycle happens in the mitochondrial matrix, the fluid-filled space inside the inner mitochondrial membrane where the cycle’s enzymes are located. This environment provides the substrates and cofactors (like acetyl-CoA, oxaloacetate, NAD+, FAD, ADP, and phosphate) needed for the oxidation of acetyl-CoA to CO2 and the production of NADH and FADH2 to drive the next stage of cellular respiration. The cytosol hosts glycolysis, not the TCA cycle, while the outer mitochondrial membrane and the intermembrane space aren’t where the full enzyme set of the cycle operates.

The Krebs cycle happens in the mitochondrial matrix, the fluid-filled space inside the inner mitochondrial membrane where the cycle’s enzymes are located. This environment provides the substrates and cofactors (like acetyl-CoA, oxaloacetate, NAD+, FAD, ADP, and phosphate) needed for the oxidation of acetyl-CoA to CO2 and the production of NADH and FADH2 to drive the next stage of cellular respiration. The cytosol hosts glycolysis, not the TCA cycle, while the outer mitochondrial membrane and the intermembrane space aren’t where the full enzyme set of the cycle operates.

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