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The flattened membrane sacs inside a chloroplast are called

  • A.thylakoids
  • B.cristae folds
  • C.matrix sacs
  • D.porin channels

Answer: A

Stacks of them form the grana, and the pigment systems that capture light are embedded in their membranes. Cristae are the corresponding folds in a mitochondrion and carry a different set of proteins. The two organelles solve the same problem of membrane area in different ways.

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