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Complex IV

The following...

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

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B

A

=

cytochrome Q, B

=

coenzyme Q

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C

A

=

Fe-S protein , B

=

FMN

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D

A

=

FMN, B

=

Fe-S protein

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Solution

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.

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