A) Cytochrome
B) Phytochrome
C) Phaophytin
D) Plastocynin
Correct Answer: A
Solution :
Cytochromes are proteins with characteristic strong absorption of visible light due to their non-containing heme prosthatic groups In the photochemical reaction of photo system II, the excited \[{{P}_{680}}\] transfer an electron to pheophytin within picoseconds giving it a negative charge. The pheophytin very rapidly passes its extra electron Q) protein bound plastoquinone. In photo system I, the excited \[{{P}_{700}}.\] losses an electron to an acceptar Ao i.e., becomes Pyoo is a strong oxidizing agent which quickly acquires an electron from plastocyanin (a soluble Cu containing electron transfer protein). Like complex III (ubiquinone to cytochrome c) of mitochondria, the cytochrome \[{{b}_{6}}f\]in chioroplast conveys electron from a reduced quinone a mobile lipid soluble carrier of two electron (Q in mitochondria \[P{{Q}_{B}}\] in chioroplast) to a water soluble . protein that carriers one electron (cytochrome c in mitochondria plastocyanin in chioroplast) Phytochrome is an amorphous photo receptor chromoprotein or protein pigment which exists in two states i. e.. blue and yellow is green, phytochrome is active above 550 nm. It regulates many development phenomena in plants like germination of seeds, photomorphogenesis, photoperiodism etc
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