Which is the main energy source cells use for most of their work?

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Multiple Choice

Which is the main energy source cells use for most of their work?

Explanation:
ATP serves as the main energy source because it’s the immediate energy currency of the cell. When a cell needs energy, it cleaves a phosphate group from ATP, releasing energy and converting it to ADP (or AMP in some cases). That released energy powers the work the cell does—pumping ions across membranes, driving muscle or motor protein movement, and enabling biosynthetic reactions. NADH, while essential, is an electron carrier that helps generate ATP rather than providing direct work energy. ADP and AMP are the lower-energy forms that must be recharged back into ATP to supply more energy. So the molecule used directly to power most cellular processes is ATP.

ATP serves as the main energy source because it’s the immediate energy currency of the cell. When a cell needs energy, it cleaves a phosphate group from ATP, releasing energy and converting it to ADP (or AMP in some cases). That released energy powers the work the cell does—pumping ions across membranes, driving muscle or motor protein movement, and enabling biosynthetic reactions. NADH, while essential, is an electron carrier that helps generate ATP rather than providing direct work energy. ADP and AMP are the lower-energy forms that must be recharged back into ATP to supply more energy. So the molecule used directly to power most cellular processes is ATP.

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