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A-Level Biology OCR A

Envelope Internal Thylakoids Outline Structure Function Chloroplasts Site

Chloroplasts are the sites of photosynthesis, enclosed by a double membrane and containing internal structures like thylakoids and stroma, alongside their own DNA and ribosomes.

Chloroplasts are the sites of photosynthesis, enclosed by an envelope. They contain thylakoids (stacked into grana) and stroma and possess their own ribosomes and DNA.

Front Outline the structure and function of chloroplasts.
Back Chloroplasts - the site of photosynthesis
  • Surrounded by an envelope
  • Within the envelope - internal network of membranes which form flattened sacs - thylakoids
  • Stacked thylakoids - granum (contain chlorophyll pigments) which are joined together by lamellae
  • Internal liquid - stroma
  • Have their own ribosomes (70S) and DNA to produce their own proteins.

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