Biochemistry, molecular genetics, and biology glossary terms for Companion Sites.


Plasmids are small circular, extrachromosomal, mobile genetic elements that can be transmitted from one bacterium to another through the pili during conjugation.

Plasmids are not to be confused with plastids, which are chloroplasts – cellular, membrane- bounded organelles containing photosynthetic and/or acessory pigments in their internal (thylakoid) membranes. The plastid is the site of photosynthesis in eukaryotic cells, and is the site of the Calvin cycle just as the mitochondrion is the site of oxidative phosphorylation.

. . . since 10/06/06