Cellular Energy

AP Biology· difficulty 3/5

A reaction with negative ΔG (left, going downhill) is _______; one with positive ΔG (right, going uphill) is _______.

A
$non-spontaneous; non-spontaneous$
B
$spontaneous; spontaneous$
C
$exergonic; endergonic$
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D
$endergonic; exergonic$

Explanation

Exergonic reactions release energy and proceed spontaneously. Endergonic reactions absorb energy and need an external source (often coupling to ATP hydrolysis).

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