What is the main purpose of cellular respiration?

The main purpose of cellular respiration is to convert biochemical energy from nutrients into adenosine triphosphate (ATP). ATP serves as a primary energy currency in cells, allowing them to perform various functions necessary for survival and growth. During cellular respiration, glucose and other nutrients are broken down through a series of metabolic pathways, releasing energy that is then captured in the form of ATP.

This process occurs in several stages: glycolysis, the citric acid cycle (Krebs cycle), and the electron transport chain. During these stages, the energy stored in the chemical bonds of glucose is transferred to ATP molecules, which can then be utilized by cells for activities such as muscle contraction, active transport, and biosynthesis of macromolecules. Thus, the central significance of cellular respiration lies in its role as a mechanism for energy production, making option B the accurate representation of its purpose.