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Thylakoids

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General Biology I

Definition

Thylakoids are membrane-bound compartments inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis where sunlight is converted into chemical energy.

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5 Must Know Facts For Your Next Test

  1. Thylakoids contain chlorophyll, the pigment that captures light energy.
  2. They are organized into stacks called grana.
  3. The space inside a thylakoid is known as the thylakoid lumen.
  4. ATP synthesis happens in the thylakoid membrane during photosynthesis.
  5. Thylakoids play a crucial role in converting solar energy into ATP and NADPH.

Review Questions

  • What role do thylakoids play in photosynthesis?
  • How are thylakoids arranged within the chloroplasts?
  • What important molecules are found in the thylakoid membrane?
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