Plastids · Botany

The colorless fluid matrix surrounding the thylakoid system where the Calvin Cycle occurs is the:

  1. Lumen
  2. Periplasmic space
  3. Cytosol
  4. Stroma
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Correct answer: Stroma

The stroma contains the enzymes necessary for the light-independent reactions (Calvin Cycle), such as RuBisCO. It also houses the plastid's DNA, ribosomes, and starch granules.

Difficulty: Medium Question 7 of 20

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