Summary:
- 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.