Which of the following is a primary product of cellular respiration?

The primary product of cellular respiration is ATP, or adenosine triphosphate. This molecule serves as the main energy currency of the cell, providing the energy required for various cellular processes, such as muscle contraction, nerve impulse propagation, and biosynthesis of macromolecules.

During cellular respiration, glucose is broken down through a series of biochemical reactions, primarily in the presence of oxygen (in aerobic respiration), to release energy. This energy is captured in the form of ATP. While glucose is the initial substrate and carbon dioxide is a byproduct of the process, neither of these serves as the main purpose of cellular respiration; rather, they play roles within the overall metabolic pathway. Thus, ATP's crucial role as an energy carrier highlights why it is considered the primary product of cellular respiration.