How many molecules of ATP are gained during anaerobic respiration of one molecule of glucose?

Explanation

During anaerobic respiration, the process of glycolysis breaks down one molecule of glucose into two molecules of pyruvate, yielding four ATP molecules. However, two ATP molecules are used up in the initial steps of glycolysis, resulting in a net gain of two ATP molecules. Option B is correct because it accurately reflects this net gain. Options A and C refer to the ATP yield from aerobic respiration, which involves additional processes such as the citric acid cycle and electron transport chain, resulting in a higher ATP production. Option D incorrectly states the net gain, as it doesn't consider the ATP used during glycolysis.