When we exercise for a period of time, our muscles begin to ache. This sensation is a result of the buildup of lactic acid as a result of lactic acid fermentation. Since fermentation is being used to synthesize energy, this means that [ Select ] organic molecules oxygen molecules inorganic molecules are used as the terminal electron acceptors. This process is important because [ Select ] NADH NAD+ FADH2 FADH glucose can be regenerated. This molecule can be reduced to [ Select ] NADH NAD+ FADH2 FADH glucose in glycolysis, allowing the cell to obtain energy through this process.

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Carefully parse the prompt and fill-in options as described. The question describes fermentation during extended exercise and asks about what serves as the terminal electron acceptor, why fermentation is important in this context, and which molecule is reduced in glycolysis. First blank: - Option under consideration: organic molecules vs oxygen vs inorganic molecules. In fermentation, the terminal electron acceptor is an organic molecule derived from the substrate itself (for example, pyruvate or another organic metabolite), not an inorganic molecule or molecular oxygen. Therefore, the statement that organic molecules s......Login to view full explanation