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The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is

1. iron-sulphur protein
2. ferredoxin
3. quinone
4. cytochrome

Correct answer: quinone

Solution

In photosystem II, excited chlorophyll passes its electron to a primary acceptor in the reaction center, which is a quinone. Ferredoxin and iron-sulphur proteins function later in photosystem I, while cytochromes are part of the electron transport chain, not the first acceptor from PSII chlorophyll.

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