Which of the following best describes the overall energy change during cellular respiration?

• A. It results in a net input of energy, requiring ATP to proceed.
• B. It neither releases nor requires energy; the process is energy-neutral.
• C. It results in a net output of energy, releasing ATP for cellular activities.
• D. It stores energy in glucose molecules.

Answer: (C)

Verified step by step guidance

1. Step 1: Begin by understanding the process of cellular respiration. Cellular respiration is a metabolic pathway that converts glucose into usable energy in the form of ATP (adenosine triphosphate). It occurs in three main stages: glycolysis, the citric acid cycle (Krebs cycle), and oxidative phosphorylation.
2. Step 2: Analyze the energy dynamics of cellular respiration. During this process, glucose is broken down, and the chemical energy stored in its bonds is released. This energy is then used to synthesize ATP, which serves as the primary energy currency for cellular activities.
3. Step 3: Consider the net energy change. Cellular respiration results in a net output of energy because more ATP is produced than is consumed during the process. This is why it is considered an energy-releasing (exergonic) process.
4. Step 4: Compare the given options. The correct description aligns with the fact that cellular respiration releases energy, producing ATP that can be used for various cellular functions. The other options either misrepresent the energy dynamics or describe processes unrelated to cellular respiration.
5. Step 5: Conclude that the correct answer is: 'It results in a net output of energy, releasing ATP for cellular activities,' as this accurately describes the overall energy change during cellular respiration.