In the presence of which molecule does aerobic respiration occur?

Rationale

Oxygen is the molecule in the presence of which aerobic respiration occurs.

Aerobic respiration is a process in which cells produce energy through the combustion of glucose in the presence of oxygen. The process results in the production of carbon dioxide and water, and it releases a significant amount of energy, which is used to synthesize ATP from ADP and inorganic phosphate.

A (Oxygen) CORRECT

Oxygen is essential for aerobic respiration. It acts as the final electron acceptor in the electron transport chain, a key component of the aerobic respiration process. Without oxygen, this chain would cease to function and aerobic respiration could not occur.

B (Lactic acid) YOUR ANSWER

Lactic acid is not involved in aerobic respiration. Instead, it is a byproduct of anaerobic respiration, a process that occurs when oxygen is not available. In human muscle cells, glucose is converted into lactic acid when there is insufficient oxygen for aerobic respiration, such as during strenuous exercise.

C (Carbon dioxide) YOUR ANSWER

Carbon dioxide is a product of aerobic respiration, not a reactant. It is produced during the Krebs cycle, when acetyl CoA is broken down. Therefore, its presence is a result of aerobic respiration and not a requirement for the process to occur.

D (Water) YOUR ANSWER

Water is also a product of aerobic respiration, not a substance in the presence of which the process occurs. It is produced when oxygen accepts electrons and protons at the end of the electron transport chain.

Conclusion

Aerobic respiration is a cellular process that requires oxygen to generate energy in the form of ATP. The other molecules listed, lactic acid, carbon dioxide, and water, are either products of respiration or associated with different biological processes. Therefore, the only correct answer to the question of in the presence of which molecule does aerobic respiration occur is oxygen.

In the presence of which molecule does aerobic respiration occur?

Oxygen is the molecule in the presence of which aerobic respiration occurs.

Related Questions

Related Quizzes

How familiar were you with this question?

Report an Issue

Rate this Practice Test