Question

The following is a scheme showing the electron transport system. Identify the electron carrier molecules indicated as A and B. Choose the correct option.

• A. A$=$coenzyme Q, B$=$cytochrome c
• B. A$=$cytochrome Q, B$=$coenzyme Q
• C. A$=$Fe-S protein , B$=$FMN
• D. A$=$FMN, B$=$Fe-S protein

Answer 1

The correct option is A A$=$coenzyme Q, B$=$cytochrome c

The movement of felctrons in electron transport system takes place from FMN to coenzyme Q which acts both as a coenzyme as well as electron carrier. Coenzyme q passes it to cytochrome b and c${}_1$ and then to cytochrome c. Thus, A is coenzyme Q and B is cytochrome c.