Question

The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products.
Arrows numbered 4, 8 and 12 can all be

• A. NADH.
• B. ATP.
• C. $H_{2}O$.
• D. $FA{D}^{+}$ or $FAD{H}_2$.

Answer 1

The correct option is B ATP.

Glucose goes through three major pathways - Here, pathway A is glycolysis where 4 ATP are generated. Then the next pathway B is Krebs cycle where 8 ATP are generated after which, the last cycle is oxidative phosphorylation, where 12 ATP are generated.
Thus, the correct answer is option (B).