How many molecules of ATP are produced in the light-dependent reactions for each

Practice Questions

Q1
How many molecules of ATP are produced in the light-dependent reactions for each molecule of glucose synthesized?
  1. 18
  2. 12
  3. 6
  4. 24

Questions & Step-by-Step Solutions

How many molecules of ATP are produced in the light-dependent reactions for each molecule of glucose synthesized?
Correct Answer: 18 ATP molecules
  • Step 1: Understand that glucose is produced during photosynthesis, which occurs in plants.
  • Step 2: Know that photosynthesis has two main stages: light-dependent reactions and light-independent reactions (Calvin cycle).
  • Step 3: Focus on the light-dependent reactions, which occur in the thylakoid membranes of chloroplasts.
  • Step 4: Recognize that during the light-dependent reactions, sunlight is used to split water molecules, producing oxygen and energy carriers.
  • Step 5: Identify that the energy carriers produced are ATP and NADPH.
  • Step 6: Learn that for every molecule of glucose synthesized (which requires multiple cycles of the Calvin cycle), a total of 18 ATP molecules are generated from the light-dependent reactions.
  • Step 7: Conclude that for each glucose molecule synthesized, 18 ATP molecules are produced in the light-dependent reactions.
  • Light-Dependent Reactions – These are the first stage of photosynthesis where light energy is converted into chemical energy in the form of ATP and NADPH.
  • ATP Production – The process of generating ATP during the light-dependent reactions, which is crucial for the subsequent synthesis of glucose.
  • Glucose Synthesis – The process of forming glucose during the light-independent reactions (Calvin cycle) using ATP and NADPH produced in the light-dependent reactions.
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