Question

12 fill in the blank 1 point
some eukaryotic cells can survive without oxygen. only the glycolysis phase of cellular respiration will operate under those circumstances.
predict the number of atp molecules that could be produced from one glucose molecule if oxygen were not available choose your answer.
since oxidative phosphorylation no longer occurs when oxygen is not available, predict what would eventually happen to the supply of nad+ in the cell if only glycolysis were operating. choose your answer.
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Explanation:

Step1: Recall glycolysis ATP - production

In glycolysis, 2 ATP molecules are produced per glucose molecule through substrate - level phosphorylation. Since only glycolysis occurs without oxygen, the number of ATP produced from one glucose molecule is 2.

Step2: Recall NAD+ role in glycolysis

Glycolysis requires NAD+ to accept electrons. When only glycolysis is operating and there is no oxygen for oxidative phosphorylation, the cell must regenerate NAD+ for glycolysis to continue. In the absence of oxygen, fermentation occurs. In lactic - acid fermentation (in animals) or alcoholic fermentation (in yeast), NADH donates its electrons to pyruvate, regenerating NAD+. But if there is no mechanism to regenerate NAD+ (if fermentation is inhibited), the supply of NAD+ will run out as it is continuously being converted to NADH during glycolysis, and glycolysis will stop.

Answer:

1. 2
2. The supply of NAD+ would run out and glycolysis would stop unless NAD+ is regenerated through fermentation.