Question

1 molecule of glucose and 6 molecules of O$2$ and 38 ADP combined to form 6H$_2$O, 6CO$_2$ and
A. 38 molecules of ATP.
B. 28 ATP
C. 38 ADP
D. 28 ADP

Answer 1

The cellular respiration is a metabolic process to obtain energy from the energy-rich molecule (food), in which chemical energy is converted into ATP molecule which releases energy and waste products.

Complete answer: cellular respiration is a combustion reaction and catabolic process in which large molecules are converted into smaller molecules and release energy. Cellular respiration is mainly aerobic respiration, which requires oxygen for the oxidation of food. It is a three-step process to yield carbon dioxide, water, and 38 molecules of ATP which is the energy currency of the cell.
Glycolysis:- It is a metabolic reaction in which sugar molecule is spilled into smaller subunit, in case of one glucose molecule is converted into two molecules of pyruvate compound and generate two molecules of ATP and four molecules of ATP is produced, two ATP is consumed out of four during this process.
Krebs cycle:- it is also called a citric acid cycle, in this acetyl-CoA is produced from pyruvate in presence of oxygen, this reaction is 8 step process that required 18 different enzyme and coenzymes, the net gain of NADH and FADH$_2$ is 3:1 with high-energy GTP molecule in per cycle of Krebs. The total production of ATP molecules is 30 or 32, the 3 to 5 in glycolysis and 5 in the oxidative decarboxylation of pyruvate and 20 ATP in Krebs cycle. The theoretical yield is 38 ATP molecules per glucose during cellular respiration.
Hence, the correct option is A.

Note: Anaerobic respiration is performed by a certain group microorganism, which does not use oxygen nor form pyruvates which are high energy final electron acceptor, rather sulfate or nitrate which are inorganic acceptor is used.