The reduced coenzymes generated by the citric acid cycle donate electrons in a series of reactions called the electron transport chain. the energy from the electron transport chain is used for oxidative phosphorylation.

which compounds donate electrons to the electron transport chain?
h 2 o o 2 adp fad fadh 2 nadh atp nad +
which compound is the final electron acceptor?
adp nadh h 2 o o 2 nad + fadh 2 atp fad
which compounds are the final products of the electron transport chain and oxidative phosphorylation?
fadh 2 adp fad o 2 h 2 o nadh nad + atp

The answer of ist question FADH2,NADH 2nd question O2  3rd question NAD+,FAD,H2O,ATP.

Explanation:

Ist answer

During electron transport chain electrons are donated by reduced coenzymes such as NADH and FADH2.

2nd answer

During electron transport chain oxygen or O2 act as terminal electron acceptor which accepts and then undergo reduction to generate H2O.

3rd answer

The final products of electron transport chain and oxidative phosphorylation are NAD+, FAD,H2O and ATP.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.