The breakdown of glucose sugar molecules by aerobic respiration, when oxygen is present in your cells, yields approximately times more ATP than does the breakdown by fermentation when your cells are oxygen-deprived.

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Explanation:

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4

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.