Photosynthesis Question 37
37. The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is
(a) iron-sulphur protein
(b) ferredoxin
(c) quinone
(d) cytochrome
Show Answer
Answer : c
Hints & Solution
(c) The first acceptor of electrons from an excited chlorophyll of PSII is quinone. Quinones represent a class of toxicological intermediates which can create a variety of hazardous effects in vivo, including acute cytotoxicity, immunotoxicity, and carcinogenesis. Quinones are Michael acceptors, and cellular damage can occur through alkylation of crucial cellular proteins and/or DNA.
