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Which molecule is produced as a byproduct of the light reactions?

Practice Questions

Q1
Which molecule is produced as a byproduct of the light reactions?
  1. Glucose
  2. Oxygen
  3. NADPH
  4. ATP

Questions & Step-by-Step Solutions

Which molecule is produced as a byproduct of the light reactions?
Correct Answer: Oxygen
  • Step 1: Understand that photosynthesis occurs in two main stages: light reactions and dark reactions.
  • Step 2: Know that light reactions take place in the thylakoid membranes of chloroplasts.
  • Step 3: Realize that during light reactions, sunlight is absorbed by chlorophyll.
  • Step 4: Learn that water molecules (H2O) are split to provide electrons and protons.
  • Step 5: Understand that this splitting of water produces oxygen (O2) as a byproduct.
  • Step 6: Conclude that the oxygen produced is released into the atmosphere.
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