Verified Answer :

The Krebs cycle occurs in the mitochondrial matrix (mitochondria) and generates a pool of chemical energy (ATP, NADH, and FADH2) from the oxidation of pyruvate, the end product of glycolysis. 
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Answer: A. mitochondria

Explanation:

The Krebs cycle is the set of reactions that drives to the complete oxidation of glucose. This occurs in the matrix of eukaryote mitochondria and the prokaryotyc cytoplasm. The main reagents of the Krebs cycle are acetate in the form of acetyl-CoA, water, and electron carriers. The main reagents of the Krebs cycle are acetate in the form of acetyl-CoA, water, and electron carriers. Reactions are catalyzed by enzymes where decarboxylases stand out (decarboxylation catalysts) and dehydrogenases (oxidation-reduction catalysts) leading to the formation of NADH).

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