Question

In aerobic cellular respiration, most ATP is synthesized during:
(a)Electron transport
(b)Glycolysis
(c)Krebs cycle
(d)Oxidation of pyruvic acid

Answer 1

A sequence of chemical reactions that occur in the majority of aerobic organisms and are part of the aerobic cell metabolism process by which glucose and other molecules are broken down into carbon dioxide and water in the presence of oxygen to release chemical energy in the form of ATP.

Complete answer:
In three stages, cellular respiration takes place:
-Glycolysis
-Cycle Krebs
-Oxidation of terminals
Glycolysis is the division of glucose into two pyruvate molecules where 2 NADH and 2 ATP molecules are formed, which in total is 8 ATP molecules as 1 NADH = 3 ATP, while in mitochondria where 10 NADH molecules, 2 FADH, and 4 ATP molecules are formed, 38 ATP molecules are formed in total in Krebs cycle reaction.
The cycle of Krebs creates the carbon dioxide that you breathe out. Much of the energy is produced at this point (34 ATP molecules, compared to only 2 ATP for glycolysis and 2 ATP for the cancer cycle). It is in the mitochondria where the electron transport chain takes place. This process transforms NADH into ATP.

Additional Information: The mechanism by which one glucose molecule is converted into two pyruvate molecules, two hydrogen ions, and two water molecules is glycolysis. The 'high-energy' molecules of ATP and NADH are synthesized via this process. The molecules of pyruvate then proceed to the link reaction, where acetyl-CoA is produced.
The electron transport chain is a series of complexes that transfer electrons by redox reactions from electron donors to electron acceptors, and couples this electron transfer with proton transfer across a membrane. Peptides, enzymes, and other molecules are built into the electron transport chain.
Overall, pyruvate oxidation transforms pyruvate, a three-carbon molecule, into a two-carbon molecule attached to Coenzyme A, acetyl CoA start a text, C, o, A, end text, producing an NADH start a text, N, A, D, H, end text, and releasing one molecule of carbon dioxide in the process.
So, the correct answer is ‘Krebs cycle’.

Note: The tricarboxylic acid (TCA) cycle is the primary source of energy for cells and an essential part of aerobic respiration, also known as the Krebs or citric acid cycle. The cycle harnesses the available chemical energy of acetyl coenzyme A (acetyl CoA) into the nicotinamide adenine dinucleotide (NADH) reduction capacity.