Six facts about organelles
Organelles are structures inside eukaryotic cells that carry out functions.
The main organelles are nucleus, cell membrane, chloroplast, mitochondria, endoplasmic reticulum, cell wall and golgi apparatus.
Most organelles are membrane bound, they have a unit membrane around them.
A particular cell will have more of some organelles because they enable it to carry its function.
Prokaryotic cells do not have membrane bound organelles.
Some organelles are visible with a light microscope because they are big enough to be resolved.