• Photosynthesis occurs in the chloroplast, an organelle specific to plant cells.
  • Part of the photosynthesis reactions occur in an internal membrane within the organelle.
  • Chloroplasts closely resemble some types of bacteria and even contain their own circular DNA and ribosomes.
  • In addition to enzymes, two basic types of molecules - pigments and electron carriers - are also found in the thylakoid membranes.
  • Electrons in transport chains behave much like a ball bouncing down a set of stairs – a little energy is lost with each bounce.
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