Question

which organelle is ultimately responsible for breaking down carbohydrates into usable energy at the molecular level? a atp b mitochondria c ribosomes d golgi apparatus

Explanation:

• Option A: ATP is the energy currency, not an organelle that breaks down carbohydrates.
• Option B: Mitochondria are the "powerhouses" of the cell. They perform cellular respiration, which includes breaking down carbohydrates (after glycolysis in the cytoplasm) and using the products to generate ATP (usable energy) through processes like the Krebs cycle and oxidative phosphorylation.
• Option C: Ribosomes are responsible for protein synthesis, not carbohydrate breakdown for energy.
• Option D: The Golgi Apparatus is involved in modifying, sorting, and packaging proteins and lipids, not energy production from carbohydrates.

Answer:

B. Mitochondria