A) \[cyt.\text{ }a,\text{ }b,\text{ }c,\text{ }{{a}_{3}}\]
B) \[~cyt.\text{ }b,\text{ }c,\text{ }a,\text{ }{{a}_{3}}\]
C) \[~cyt.\text{ }b,\text{ }a,\text{ }{{a}_{3}},c\]
D) \[~cyt.\text{ }b,c,\,{{a}_{3}},a\]
Correct Answer: B
Solution :
Cytochromes are proteins with characteristic strong absorption of visible light due to their iron-containing heme prosthatic groups. Mitochondria contain three classes of cytochromes designated a, b and c distinguished by differences in their light absorption spectra. The cytochrome of type a and b and some of type c are integral proteins of inner mitochondrial membrane. The sequence of electron carriers in ETS is: \[NADH\to Q\to Cyt.\,\]\[b\to Cyt.\]\[{{c}_{1}}\to Cyt.\,c\] \[\to Cyt.a\to Cyt.{{a}_{3}}\to {{O}_{2}}.\]
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