Question

the most common electron carrier is ______________.
nadh
nad
fadh

Explanation:

In cellular respiration and other metabolic processes, NADH is a very common electron - carrier. It is formed when NAD⁺ accepts electrons and a hydrogen ion. NAD is the oxidized form and not an electron - carrier in the reduced state like NADH. FADH is also an electron - carrier but less common than NADH.

Answer:

A. NADH