Which form of energy is directly usable to perform cellular work?

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Multiple Choice

Which form of energy is directly usable to perform cellular work?

Cells can only do work using the portion of energy that remains as free energy to drive processes at the conditions inside the cell. This usable energy is described by Gibbs free energy, which takes into account temperature and entropy to indicate how much energy can actually be harnessed to perform work. When the change in free energy (ΔG) for a reaction is negative, energy is released in a form the cell can capture and use—often by powering ATP synthesis or by driving other cellular tasks. Enthalpy is just the total heat content, which isn’t a direct measure of how much energy is available to do work under cellular conditions, and entropy describes disorder rather than usable energy. So the energy that is directly usable for cellular work is free energy, the portion that can be harnessed to perform work in the cell.

Cells can only do work using the portion of energy that remains as free energy to drive processes at the conditions inside the cell. This usable energy is described by Gibbs free energy, which takes into account temperature and entropy to indicate how much energy can actually be harnessed to perform work. When the change in free energy (ΔG) for a reaction is negative, energy is released in a form the cell can capture and use—often by powering ATP synthesis or by driving other cellular tasks. Enthalpy is just the total heat content, which isn’t a direct measure of how much energy is available to do work under cellular conditions, and entropy describes disorder rather than usable energy. So the energy that is directly usable for cellular work is free energy, the portion that can be harnessed to perform work in the cell.

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