Q. 18.45 - An Introduction to General, Organic, and Biological Chemistry

Question

How are electrons carried from complex $I$ to complex $\mathrm{III}$?

Step-by-Step Solution

Answer

The $\mathrm{CoQ}$ (Coenzyme $\mathrm{Q}$) transports electrons from Complex $\mathrm{I}$ to Complex $\mathrm{III}$.

Step 1: Given information

We need to find the electrons carrier of complex $\mathrm{III}$ from complex $\mathrm{I}$

Step 2: Explanation

We know that

A mobile carrier, Coenzyme $\mathrm{Q}$, transports electrons from Complex $\mathrm{I}$ and $\mathrm{II}$ to Complex $\mathrm{III}$ ($\mathrm{CoQ}$). $\mathrm{CoQ}$ is converted to ${\mathrm{CoQH}}_2$ in this mechanism, which transports electrons from Complex $\mathrm{I}$ and $\mathrm{II}$ to Complex $\mathrm{III}$.