Question

What is the number of electrons required to reduce one molecule of oxygen to water during mitochondria oxidation?

• A. $4$
• B. $3$
• C. $2$
• D. $1$

Answer 1

The correct option is A $4$

Water has 2 hydrogen and each hydrogen needs only one electron. Hence, four electrons along with four hydrogen atoms are required to reduce one molecule of oxygen (O${}_2$) to two molecules of water (H${}_2$0).

Thus, the correct answer is option A.