Question

A glucose molecule is completely broken down upon completion of glycolysis and the citric acid cycle. However, these two processes yield only a few ATPs. What other energy carrier(s) that can be used to synthesize more ATPS is/are also generated during these processes?

A: oxygen used in the electron transport chain
B: NADH and FADH2
C: heat
D: FAD and NAD+

Answer 1

B

Step-by-step explanation:

Answer 2

B: NADH and FADH2

Step-by-step explanation:

The processes of glycolysis and Kreb's cycle produce NADH and FADH2. Glycolysis obtains 2 NADH per glucose while Kreb's cycle obtains 6 NADH and 2 FADH2 per glucose molecule. In addition, the oxidation of pyruvate into acetyl CoA also obtains 2 NADH per glucose.

Oxidation of these reducing powers via electron transport chain wherein molecular oxygen serves as an electron acceptor generates a proton concentration gradient across the inner mitochondrial membrane. The energy of the proton concentration gradient is harnessed to drive ATP synthesis. Therefore, the electron transport chain obtains the maximum number of ATP molecules produced during aerobic cellular respiration by oxidizing NADH and FADH2.