Question

Which electron carrier has the lowest (most negative) midpoint reduction potential?

Group of answer choices

Cytochrome b

Plastoquinone

P680 with an excited electron

Plastocyanin

Answer 1

The reduction potential is increased from one elcetron acceptor to the next electron acceptor. The given options are found in the light phase of photosynthesis.

The reduction potential is found to be more in the molecule which is found later in the stages of light dependent phase of photosynthesis.

Here the order of reduction potential is :

P680 with an excited electron< Plastoquinone<Cytochrome b<Plastocyanin

Hence lowest reduction potential is found in P680 with an excited electron.

Answer is C option.

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