Biology / Unit 2 Bio 0273 short lesson, about 20 seconds
Chloroplasts
Captions available
The idea
A chloroplast is a double-membrane plant organelle, with its own DNA and ribosomes, that carries out photosynthesis using stacked thylakoids within a stroma.
In practice
Chlorophyll in the thylakoid membranes captures light energy, while sugar synthesis happens in the surrounding stroma.
Where people slip
Chloroplasts belong to plant cells and some protists only — animal cells never carry them.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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