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The first acceptor of electrons from an excited chlorophyll of PSII is quinone.

1. Quinones represent a class of toxicological intermediates which can create a variety of hazardous effects in vivo, including acute cytotoxicity, immunotoxicity, and carcinogenesis.
2. Quinones are Michael acceptors, and cellular damage can occur through alkylation of crucial cellular proteins and/or DNA.
3. Quinones are the first acceptors of electrons in PSII.
4. Quinones are not involved in photosynthesis.

Correct answer: Quinones are the first acceptors of electrons in PSII.

Solution

In photosystem II, the excited chlorophyll donates an electron to a quinone-type primary acceptor. This is why the statement that quinones are the first acceptors of electrons in PSII is correct.

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