Cellular Energy

AP Biology· difficulty 2/5

A free-energy diagram for a hypothetical biochemical reaction is shown.

Reaction progress Free energy ΔG Ea

The diagram represents which kind of reaction?

  • A

    Isothermic - no change in free energy

  • B

    Endergonic - requires a net input of energy

  • C

    Exergonic - products have less free energy than reactants

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  • D

    Equilibrium - no net direction

Explanation

The products lie below reactants on the free-energy axis, so ΔG is negative. The reaction releases free energy and is exergonic (spontaneous).

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