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

Options

A. NADH
B. ATP
C. `H_(2)O`
D. `FAD^(+) or FADH_(2)`

Answer

B

Explanation

Pathway A is glycolysis , pathway B is the Krebs' cycle and pathways C is oxidative phosphorylation
Arrow 1-ADP or `NAD^(+)`
Arrow 2- Pyrvate
Arrow 3-NADH
Arrow 4- ATP
Arrow 5- ADP,`NAD^(+)` or FAD
Arrow 6 and 7 -`FADH_(2) and NADH`
(either one can be 6 or 7)
Arrow 8-ATP or `CO_(2)`
Arrow 9 and 10 -`O_(2)` and ADP (either one can be 9 or 10)
Arrow 11 and 12 -`H_(2)O` and ATP (either one can be 11 or 12)