<biochemistry> Any of a group of complex organic compounds which contain carbon, hydrogen, oxygen, nitrogen and usually sulphur, the characteristic element being nitrogen and which are widely distributed in plants and animals.
They serve as enzymes, structural elements, hormones, immunoglobulins, etc. And are involved in oxygen transport, muscle contraction, electron transport and other activities throughout the body and in photosynthesis.
Origin: Gr. Protos = first
(11 Mar 2008)
|Bookmark with:||word visualiser||Go and visit our forums|