Protoctists are any
unicellular or simple multicellular organism belonging to the kingdom
Protoctista, which includes protozoans, algae, and slime moulds. Unlike bacteria they are made of eukaryotic cells: cells with a nucleus
and organelles like mitochondria and chloroplasts. Some protoctists
like Amoeba share many features with animal cells while others like Chlorella are more plant-like and contain chloroplasts to photosynthesise. Some protoctists are pathogenic for example Plasmodium, the single celled organism that causes the disease Malaria.
