The light-dependant reaction of photosynthesis takes place in the thylakoids of chloroplasts. The thylakoids are disc-like structures that are stacked together in groups called grana.
Chloroplasts are structurally adapted to their function of capturing sunlight and carrying out the light-dependent reaction of photosynthesis in the following ways:
- The thylakoid membranes provide a large surface area for the attachment of chlorophyll, electron carriers and enxymes that carry out the light-dependent reaction.
- A network of proteins in the grana hold the chlorophyll in a very precise manner that allows maximum absorption of light
- The granal membranes have enzymes attached to them, which help manufacture ATP.
- Chloroplasts contain both DNA and ribosomes so they can quickly and easily manufacture some of the proteins needed for the light dependent-reaction.
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