The primary function of cellular respiration is to provide a source of energy for all cell metabolism. Which molecule is the main energy currency produced during this process?

• A. Nicotinamide adenine dinucleotide (NADH)
• B. Glucose
• C. Carbon dioxide (CO\(_2\))
• D. Adenosine triphosphate (ATP)

Answer: (D)

Verified step by step guidance

1. Understand the concept of cellular respiration: Cellular respiration is a metabolic process that converts glucose and oxygen into energy, carbon dioxide (CO\(_2\)), and water. This energy is stored in the form of a molecule called Adenosine Triphosphate (ATP).
2. Identify the role of ATP: ATP is the main energy currency of the cell. It provides energy for various cellular processes, such as muscle contraction, active transport, and chemical reactions.
3. Differentiate between the molecules listed: NADH is an electron carrier that helps transfer energy during cellular respiration, but it is not the main energy currency. Glucose is the starting material for cellular respiration, and CO\(_2\) is a byproduct of the process.
4. Recognize the correct molecule: ATP is synthesized during cellular respiration, specifically in the final stage called oxidative phosphorylation, which occurs in the mitochondria.
5. Conclude that ATP is the correct answer: ATP is the molecule that directly powers cellular activities, making it the main energy currency produced during cellular respiration.