During exercise, stored chemical energy is converted to energy that can be used for which of the following cellular processes?

• A. Protein denaturation
• B. Muscle contraction
• C. DNA replication
• D. Photosynthesis

Answer: (B)

Verified step by step guidance

1. Understand the context of the problem: During exercise, the body requires energy to perform various cellular processes. This energy is derived from stored chemical energy, such as glycogen or fat, which is converted into usable energy in the form of ATP (adenosine triphosphate).
2. Review the options provided: Protein denaturation, muscle contraction, DNA replication, and photosynthesis. Consider which of these processes is directly related to exercise and requires energy.
3. Eliminate irrelevant options: Protein denaturation is a process where proteins lose their structure due to external stress, not directly related to energy use during exercise. DNA replication is a process of copying genetic material, which is not directly linked to physical activity. Photosynthesis is a process in plants to convert light energy into chemical energy, which does not occur in humans.
4. Focus on muscle contraction: During exercise, muscle contraction is the primary process that requires energy. ATP is used to power the interaction between actin and myosin filaments in muscle fibers, enabling contraction and movement.
5. Conclude that the correct answer is muscle contraction, as it is the cellular process directly powered by the conversion of stored chemical energy during exercise.