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The three boxes in a diagram represent the major biosynthetic pathways in aerobic respiration. Pathway A is Glycolysis, B is Krebs cycle, and C is ETS. Arrows represent reactants/products. Arrows 4, 8, and 12, which exit from each pathway respectively, can all represent:

  1. A
    NADH
  2. B
    ATP
  3. C
    H2O
  4. D
    FADH2

Solution & Step-by-step Explanation

Glycolysis, the Krebs cycle, and the Electron Transport System all produce energy in the form of ATP (either through substrate-level phosphorylation or oxidative phosphorylation).

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The three boxes in a diagram represent the major biosynthetic pathways in aerobic respiration. Pathway A is Glycolysis, B is Krebs cycle, and C is ETS. Arrows represent reactants/products. Arrows 4, 8, and 12, which exit from each pathway respectively, can all represent:
A
NADH
B
ATP
C
H2O
D
FADH2

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