Question

Number of cytochrome molecules required for the transfer of $2e^{-}$ in ETS is

• A. 2
• B. 4
• C. 1
• D. 10

Answer 1

The correct option is A 2

Cytochromes are iron-containing proteins, which are embedded in the inner mitochondrial membrane. These proteins serve as electron carrier proteins during mitochondrial electron transport chain. The mitochondrial electron transport chain is an important constituent of cellular respiration process. Cytochrome can transfer single electron at a time. Hence, in order to transport two electrons at the same time, two molecules of cytochromes are required or else one molecule of cytochrome can transfer two electrons but one by one not simultaneously.