AP BIOLOGY

Detailed explanation-1: -Cellular respiration produces a maximum of 10 NADH and 2 FADH2 per glucose molecule. Since a single NADH produces 2.5 ATP and a single FADH2 produces 1.5 ATP, it follows that 25 ATP + 3 ATP are produced by oxidative phosphorylation.

Detailed explanation-2: -NADH and FADH2 made in the citric acid cycle (in the mitochondrial matrix) deposit their electrons into the electron transport chain at complexes I and II, respectively. This step regenerates NAD+ and FAD (the oxidized carriers) for use in the citric acid cycle.

Detailed explanation-3: -During oxidative phosphorylation, electrons derived from NADH and FADH2 combine with O2, and the energy released from these oxidation/ reduction reactions is used to drive the synthesis of ATP from ADP.

Detailed explanation-4: -Answer and Explanation: A total of 3 NADH and 1 FADH2 molecule are generated from 1 molecule of glucose by the end of the Krebs cycle.