Question

What is the most common electron acceptor in the kreb cycle?

a) nad+
b) fadh2
c) fad
d) citrate
e) nadh

Answer 1

a) nad+

Step-by-step explanation:

Both NAD+ and FAD as electron acceptor in the Kreb Cycle, but every turn of the citric acid cycle releases two carbon dioxide molecules and consumes three NAD+ to give three molecules NADH (in three different steps) but also consumes one FAD to produce one molecule FADH2 (in one single step).

Each NAD+ accepts one electron, while each FAD accepts two electrons.

Thus, NAD+ accepts three electrons in total per cycle while FAD accepts two electrons in total per cycle.