During anaerobic respiration, number of ATP molecules generated by the breakdown of 20 glucose molecule is _____.

During anaerobic respiration, the breakdown of one glucose molecule produces a net gain of 2 ATP molecules. This is because during glycolysis,2 ATP molecules are produced by substrate-level phosphorylation, but 2 ATP molecules are also used up in the process. Since anaerobic respiration does not involve the electron transport chain and oxidative phosphorylation, no additional ATP molecules are generated beyond those produced during glycolysis.I herefore, the number of AIР molecules generated by the breakdown of 20 glucose molecules would be: 20 glucose molecules \(\times 2\) ATP molecules per glucose molecule - 40 ATP molecules So the answer is (C) 40 ATP molecules.