Final answer:
Approximately 40% of the energy from cellular respiration is transformed into ATP, which cells use for various functions.
Step-by-step explanation:
About 40 percent of energy yielded from catabolic reactions during cellular respiration is directly transferred to the high-energy molecule adenosine triphosphate (ATP). ATP is used immediately to power various molecular machines within the cell, supporting cell, tissue, and organ functions, including tissue repair and new tissue growth. The remaining 60 percent is released as heat, absorbed by body fluids and tissues.
Therefore, the correct answer to the question is B) 25%. Cellular respiration makes ATP from the breakdown of glucose, and with an ideal maximum yield of about 38 ATP molecules per glucose molecule, only a portion of the energy is used for metabolic processes while the rest is lost as heat.