Dental Admissions Test (DAT) Practice Test

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Where is the Calvin cycle of photosynthesis located within a cell?

  1. Chromatin

  2. Mitochondria

  3. Smooth endoplasmic reticulum

  4. Stroma

The correct answer is: Stroma

The Calvin cycle of photosynthesis takes place in the stroma, the fluid-filled space inside the chloroplast. Chromatin is a substance found in the nucleus of a cell and has no role in photosynthesis. Mitochondria are involved in cellular respiration and have no direct involvement in photosynthesis. Smooth endoplasmic reticulum is involved in lipid and steroid synthesis, and has no role in photosynthesis. Overall, the stroma is where the majority of photosynthetic reactions occur, making it the correct answer.

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