functions of Chlamydomonas
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Chlamydomonas is used as a model organism for molecular biology, especially studies of flagellar motility and chloroplast dynamics, biogeneses, and genetics. One of the many striking features of Chlamydomonas is that it contains ion channels (channelrhodopsins) that are directly activated by light.
Chlamydomonas, like all chloroplast-containing photosynthetic eukaryotes, synthesizes chlorophyll pigments. In higher plants and green algae, including Chlamydomonas, the predominant chlorophylls are chlorophyll a and chlorophyll b.
Chlamydomonas makes its food in the same way as green plants, but without the elaborate system of roots, stem and leaves of the higher plants. It is surrounded by water containing dissolved carbon dioxide and salts so that in the light, with the aid of its chloroplast, it can build up starch by photosynthesis.