Correct Answer:
D. Glucose
Correct Answer: Glucose
Glucose is the primary source of energy used in cellular respiration, the process by which living cells produce adenosine triphosphate (ATP), the universal energy currency of the cell. During cellular respiration, glucose is broken down through glycolysis, the Krebs cycle, and the electron transport chain to release stored chemical energy. This energy powers essential biological activities such as muscle contraction, nerve impulse transmission, protein synthesis, and active transport across cell membranes. Although fats and proteins can also be used as energy sources, glucose is the body's preferred fuel because it can be metabolized efficiently and rapidly, particularly by the brain and nervous system.
- Main Energy Source: Glucose.
- Energy Molecule Produced: ATP.
- Occurs In: Cellular respiration.
- Importance: Provides energy for cellular activities.
- Correct Answer: Glucose.