Question

NADH has a strong tendency to:

1) accept electrons
2) donate electrons
3) either donate or accept electrons depending on the electrochemical proton gradient

Answer 1

NADH has a strong tendency to donate electrons in metabolic reactions and the electron transport chain in mitochondria.

Step-by-step explanation:

NADH has a strong tendency to donate electrons. NADH is the reduced form of NAD, and it can donate its electrons to other molecules in metabolic reactions. This donation of electrons is an important step in the process of cellular respiration, where NADH transfers its electrons to the electron transport chain to generate ATP.

NADH is part of the electron transport chain in mitochondria. It donates its electrons at complex I in the chain, and these electrons are passed along to complexes III and IV. As NADH donates its electrons, it is oxidized back to NAD+, ready to accept more electrons in future reactions.

So, the correct answer is 2) donate electrons.