Question

The final electron acceptor in aerobic respiration is:

a. water
b. carbon dioxide
c. oxygen
d. NAD and FAD

Answer 1

In aerobic respiration, the final electron acceptor is oxygen, which allows for the efficient production of ATP and water as byproducts.

Step-by-step explanation:

The final electron acceptor in aerobic respiration is oxygen (O₂). When aerobic respiration occurs, high-energy electrons carried by NADH and FADH₂ are passed to the electron transport chain, and this process leads to the production of ATP. The oxygen molecule accepts these electrons and, together with hydrogen, forms water as a byproduct. Therefore, the correct answer is c. oxygen.

In contrast, if aerobic respiration does not occur, other mechanisms such as fermentation or anaerobic respiration may take place, which involve different final electron acceptors. However, these processes are less efficient at producing ATP compared to when oxygen is present in aerobic respiration.

Answer 2

The correct answer will be option-C.

Step-by-step explanation:

Cellular respiration is a slow process which oxidizes food to form energy molecules like ATP. The process proceeds in four steps: Glycolysis, pyruvate decarboxylation, citric acid cycle and electron transport chain.

During the electron transport chain, the electrons from the reducing equivalents like NADH and FADH₂. The electrons move downhill by electron acceptors which gets reduced and lose the energy. The electron is finally accepted by an oxygen molecule which forms metabolic water after reacting with free hydrogen atoms.

Thus, Option-C is the correct answer.