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Which of the following shows correct order of flow of electrons in ETC?
(a) Fe-S \( \rightarrow \) NADH \( \rightarrow \) Co-Q \( \rightarrow \) Cyt- \( b \rightarrow \) Fe-S \( \rightarrow \) Cyt- \( c \)
\[
\rightarrow \mathrm{Cyt}-a_{3} \rightarrow \mathrm{O}_{2} \rightarrow \text { Cyt- } b
\]
(b) NADH \( \rightarrow \) FMN \( \rightarrow \) Fe-S \( \rightarrow \) Co-Q \( \rightarrow \) Cyt- \( b \rightarrow \) Fe-S
\[
\rightarrow \text { Cyt- } c_{1} \rightarrow \text { Cyt }-c \rightarrow \text { Cyt }-a \rightarrow \text { Cyt }-a_{3} \rightarrow \mathrm{O}_{2}
\]
(c) NADH \( \rightarrow \) Cyt- \( c_{1} \rightarrow \) Cyt- \( c \rightarrow \) Cyt \( a \rightarrow \) Cyt- \( a_{3} \rightarrow \mathrm{O}_{2} \)
\[
\rightarrow \mathrm{FMN} \rightarrow \mathrm{Fe}-\mathrm{S} \rightarrow \mathrm{Co}-\mathrm{Q} \rightarrow \mathrm{Cyt}-b \rightarrow \mathrm{Fe}-\mathrm{S}
\]
(d) Cyt- \( c_{1} \rightarrow \) Cyt- \( c \rightarrow \) Cyt \( a \rightarrow \) Cyt \( -a_{3} \rightarrow \) NADH
\[
\rightarrow \text { FMN } \rightarrow \text { Fe-S } \rightarrow \text { Co-Q } \rightarrow \text { Cyt- } b \rightarrow \text { Fe-S } \rightarrow \mathrm{O}_{2}
\]
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