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Question

In order to manage energy resources within the cell, the potential energy of an electrochemical gradient must be coupled with endergonic (less favorable) processes.
If the membrane that sustains the concentration gradient is disrupted, what happens to the cell?

A
The energetics of the cell will not be affected and will continue functioning normally.
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B
The gradient will be reversed but still able to support cellular activity.
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C
The loss of a concentration gradient reduces the potential energy of the cell and diminishes the ability to do work.
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D
The endergonic nature of the reduced gradient can be coupled to endergonic reactions such as the synthesis of ATP.
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Solution

The correct option is C The loss of a concentration gradient reduces the potential energy of the cell and diminishes the ability to do work.
The membrane maintains the potential as well as the concentration gradient.
If the membrane is broken then the concentration gradient is disrupted and the potential energy drastically reduces. Disruption of the gradient and reduction in potential energy leads to less work by the cell.
So the correct answer is 'The loss of a concentration gradient reduces the potential energy of the cell and diminishes the ability to do work'.

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