In which cellular location do the majority of the reactions of the citric acid cycle take place?
A) the cytosol.
B) the mitochondrial matrix.
C) the endoplasmic reticulum.
D) lysosomes.

Question

Quizplus · Accepted Answer

The majority of the reactions of the citric acid cycle take place in the mitochondrial matrix, which is the innermost compartment of the mitochondria. The enzymes responsible for the citric acid cycle are found in the matrix and the reactants, such as pyruvate, are transported across the mitochondrial membranes to reach the matrix. Therefore, choice B is the correct answer. Choices A, C, and D are incorrect because the citric acid cycle does not occur in the cytosol, endoplasmic reticulum, or lysosomes.

In Which Cellular Location Do the Majority of the Reactions