Question

During aerobic respiration the final electron acceptor is
A. Cyto b
B. NADH2
C. Water
D. Oxygen.

Answer 1

Hint: Aerobic respiration is the metabolic process in which oxygen is consumed for the catabolism of nutrients, which release energy, water, and carbon dioxide, and in which molecular oxygen is act as the final electron acceptor in the electron transport system.

Complete step by step answer:Cellular respiration involve series of reaction in which electron transport reaction takes place which occurs in mitochondria organelle which is said to be oxidative phosphorylation, which is energy harnessing process or ATP synthesis process. It is divided into two parts such as oxidation of NADH and FADH2 and second is phosphorylation.
The oxidation of NADH and FADH2-losing electrons via high energy molecules called Complex 1 and complex 2 respectively is called oxidation.
Cytochrome B is the protein complex that is present in the mitochondria of eukaryotes and involved in the electron transport chain reaction and it is the main transmembrane subunit of cytochrome bc1. and b6f complex.
NADH2 is the nicotinamide adenine dinucleotide, which is in its reduced form that involves an electron transport chain reaction.
Water molecule is an end product along with carbon dioxide that evolves in aerobic respiration which is an oxidation process.
Oxygen is the last or final electron acceptor molecule in aerobic respiration that has the most positive redox potential at the end of the electron transport system, molecular oxygen form water in the end by the ETS carrier.
Hence, the correct option is D.

Note:Anaerobic respiration is also another kind of respiration process in which oxygen is not involved as the electron acceptor and still uses the respiratory electron transport chain. In anaerobes use nitrate, fumarate, sulfate or Sulphur, which is a less oxidizing substance.