Which process breaks down sugar molecules to supply energy to the cell?

• A. DNA replication
• B. Protein synthesis
• C. Cellular respiration
• D. Photosynthesis

Answer: (C)

Verified step by step guidance

1. Identify the main purpose of the question: to determine which process breaks down sugar molecules to supply energy to the cell.
2. Understand the key biological concept: Cellular respiration is the process by which cells break down glucose (a sugar molecule) to produce energy in the form of ATP (adenosine triphosphate).
3. Eliminate incorrect options: DNA replication involves copying genetic material, protein synthesis involves building proteins, and photosynthesis is the process by which plants convert light energy into chemical energy stored in glucose.
4. Focus on cellular respiration: This process occurs in the mitochondria of eukaryotic cells and involves three main stages: glycolysis, the citric acid cycle (Krebs cycle), and the electron transport chain.
5. Conclude that cellular respiration is the correct answer because it directly breaks down sugar molecules to release energy for cellular activities.