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.