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Which molecule acts as the primary electron donor in the light reactions?

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Question: Which molecule acts as the primary electron donor in the light reactions?

Options:

  1. Water
  2. NADP+
  3. Glucose
  4. RuBP

Correct Answer: Water

Solution: 

Water acts as the primary electron donor in the light reactions, providing electrons.

Which molecule acts as the primary electron donor in the light reactions?

Practice Questions

Q1
Which molecule acts as the primary electron donor in the light reactions?
  1. Water
  2. NADP+
  3. Glucose
  4. RuBP

Questions & Step-by-Step Solutions

Which molecule acts as the primary electron donor in the light reactions?
Correct Answer: Water
  • Step 1: Understand that light reactions are part of photosynthesis, which occurs in plants.
  • Step 2: Know that light reactions take place in the thylakoid membranes of chloroplasts.
  • Step 3: Identify that during light reactions, sunlight is absorbed by chlorophyll.
  • Step 4: Recognize that this absorbed sunlight energy is used to split water molecules.
  • Step 5: Realize that when water is split, it releases electrons.
  • Step 6: Conclude that these released electrons are what make water the primary electron donor in the light reactions.
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