During heavy physical exertion, a mammalian muscle tissue consumes 6 molecules of glucose … — JAMB UTME

During heavy physical exertion, a mammalian muscle tissue consumes $6$ molecules of glucose under strictly anaerobic conditions, producing lactic acid. If the same $6$ molecules of glucose were instead processed through complete aerobic respiration (yielding $38$ net ATP per glucose molecule), how many additional net molecules of ATP are produced by the aerobic process compared to the anaerobic process?

$216$ net ATP moleculesCevap
B
$228$ net ATP molecules
C
$204$ net ATP molecules
D
$240$ net ATP molecules

Cevap

The aerobic process generates

216

additional net molecules of ATP compared to the anaerobic process.

Anaerobic glycolysis converts each glucose molecule into lactic acid with a net gain of

2

ATP molecules, yielding

12

net ATP for

6

glucose molecules. Complete aerobic breakdown yields

38

net ATP per glucose molecule, totaling

228

net ATP for

6

glucose molecules. The additional yield generated by aerobic respiration compared to anaerobic respiration is

228 - 12 = 216

net ATP molecules.

Adım Adım Çözüm

Calculate the net ATP yield from anaerobic respiration of

6

glucose molecules.

6 \times 2\text{ ATP} = 12\text{ net ATP}

Anaerobic glycolysis coupled with lactic acid fermentation produces a net yield of

2\text{ ATP}

molecules per molecule of glucose.

Calculate the net ATP yield from complete aerobic respiration of

6

glucose molecules.

6 \times 38\text{ ATP} = 228\text{ net ATP}

Complete aerobic oxidation (glycolysis, Krebs cycle, and oxidative phosphorylation) generates

38\text{ net ATP}

per glucose molecule under standard conditions.

Subtract the anaerobic net ATP yield from the aerobic net ATP yield.

228\text{ net ATP} - 12\text{ net ATP} = 216\text{ additional net ATP}

The question asks for the additional net ATP molecules gained by utilizing aerobic respiration over anaerobic respiration.

Anahtar Kavram

Comparative net ATP stoichiometry between aerobic respiration and anaerobic fermentation pathways

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