Question

select all that apply
select the products of the light-independent reactions that cycle back and are available for the light-dependent reactions.

□ adp
□ glucose
□ atp synthase
□ nadp⁺
□ oxygen

Explanation:

1. Recall the process of photosynthesis: Light - dependent reactions produce ATP and NADPH, which are used in light - independent (Calvin cycle) reactions. In the Calvin cycle, ATP is hydrolyzed to ADP (and Pi), and NADPH is oxidized to NADP⁺. These ADP and NADP⁺ then cycle back to the light - dependent reactions to be re - used (ADP is phosphorylated to ATP, and NADP⁺ is reduced to NADPH).
2. Analyze each option:

• Glucose: It is a product of the light - independent reactions but is not cycled back to the light - dependent reactions. It is used for energy storage or other metabolic processes.
• ATP synthase: It is an enzyme involved in the light - dependent reactions (for ATP synthesis) and is not a product of the light - independent reactions.
• Oxygen: It is a product of the light - dependent reactions (from water splitting) and not a product of the light - independent reactions.
• ADP: As explained, it is a product of the light - independent reactions (from ATP hydrolysis) and cycles back to the light - dependent reactions.
• NADP⁺: It is a product of the light - independent reactions (from NADPH oxidation) and cycles back to the light - dependent reactions.

Answer:

A. ADP, D. NADP⁺