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The fluid surrounding the thylakoids within a chloroplast is the

  • A.intermembrane space
  • B.stroma
  • C.matrix
  • D.cytosol

Answer: B

It contains the enzymes of carbon fixation together with the chloroplast's own DNA and ribosomes. The mitochondrial equivalent is called the matrix, and the two names should not be exchanged. Both compartments hold the organelle's own genome and protein-making machinery.

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