Chloroplasts

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  • Created by: jaaaz_v
  • Created on: 07-11-16 13:53
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  • Chloroplasts
    • Chloroplast envelope
      • Double cell membrane
      • Similar to mitochondrion
    • Circular DNA
      • Independent of DNA in plant cell nucleus
      • This DNA codes for proteins required for photocynthesis
      • Similar to mitochondrion and photosynthetic bacteria
    • Thylakoid membranes
      • Series of flattened sacs
      • Allow compartmentalisation
      • Allow different enzyme driven reactions to occur at once
      • Site of photosynthesis (have light harvesting units)
      • Site of electron carriers + ATP synthesis
    • Grana
      • Granum (singular)
      • Create a large surface area for photosynthesis
      • Increase light absorbing capacity
      • Similar to the infolding of cell membranes for photosynthetic pigments in some bacteria
    • Lamella
      • Membranes which join the grana together
    • Stroma
      • Equivalent to cytoplasm
      • Contains photosynthetic enzymes for the calvin cycle
      • Similar to mitochondrion (matrix)
    • Ribosomes
      • Suspended in the stroma
      • Synthesise enzymes needed in photosynthetic reactions
      • No endoplasmic reticulum

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