What is the energy molecule that is used during photosynthesis?

• A. $ATP$
• B. $NADPH$
• C. $FAD{H}_2$
• D. $GTP$

Answer: (A)

Verified step by step guidance

1. Understand the process of photosynthesis: Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose. It occurs in two main stages: the light-dependent reactions and the Calvin cycle (light-independent reactions).
2. Identify the role of energy molecules in photosynthesis: During the light-dependent reactions, energy from sunlight is used to convert ADP and NADP+ into ATP and NADPH, respectively. These molecules are then used in the Calvin cycle to synthesize glucose from carbon dioxide and water.
3. Focus on ATP and NADPH: ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate) are the primary energy carriers in photosynthesis. ATP provides energy, while NADPH provides reducing power for the Calvin cycle.
4. Consider the other molecules: FADH2 and GTP are also energy carriers, but they are not directly involved in photosynthesis. FADH2 is primarily used in cellular respiration, while GTP is involved in protein synthesis and other cellular processes.
5. Conclude with the correct molecules: Based on the roles of these molecules, ATP and NADPH are the correct energy molecules used during photosynthesis.