Question

how does nadp+ become nadph?
(1 point)

nadp+ accepts one low-
energy electron and one h+
ion.

nadp+ accepts two high-
energy electrons and one h+
ion.

nadp+ accepts one high-
energy electron and two h-
ions.

nadp+ accepts two low-energy
electrons and two h- ions.

Explanation:

To determine how NADP⁺ becomes NADPH, we recall the biochemical process: during photosynthesis (or related redox reactions), NADP⁺ acts as an electron carrier. It accepts two high - energy electrons (from electron transport chains, e.g., in photosynthetic light reactions) and one \( \text{H}^+ \) (proton). Let's analyze each option:

• Option 1: Says low - energy electron, but electrons involved are high - energy, so incorrect.
• Option 2: Matches the correct process of NADP⁺ accepting two high - energy electrons and one \( \text{H}^+ \) ion to form NADPH.
• Option 3: Incorrect ion type (\( \text{H}^- \) is not involved here, and electron count is wrong).
• Option 4: Incorrect electron energy (low - energy) and ion type (\( \text{H}^- \)).

Answer:

B. NADP+ accepts two high - energy electrons and one H+ ion.