Final answer:
Starch stores energy in its complex carbohydrate structure through photosynthesis, while ATP releases energy during cellular respiration by breaking high-energy phosphate bonds.
Step-by-step explanation:
How do starch and ATP store and supply energy? The correct answer is A: Starch stores energy through chemical bonds, and ATP releases energy during cellular respiration. Starch, as a polysaccharide, stores energy in its complex carbohydrate structure. During photosynthesis in plant cells, energy from sunlight is used to synthesize starch from glucose.
On the other hand, ATP, or adenosine triphosphate, is known as the cell's energy currency. It stores energy in its high-energy phosphate bonds and is used by cells for immediate energy needs. When these bonds are broken, energy is released to power various cellular activities. During cellular respiration, the energy stored in glucose is transformed into ATP, which is then available for immediate use by the cell.