biochemistry, a kinase is a type of enzyme that transfers
phosphate groups from high-energy donor molecules, such as
ATP, to specific substrates, a process referred to as phosphorylation.
Kinases are part of the larger family of phosphotransferases.
Kinases are not to be confused with phosphorylases, which
carry out phosphorolysis, the breaking of a bond using an
inorganic phosphate group; or with phosphatases, which remove
phosphate groups. Types One of the largest groups
of kinases are protein kinases, which act on and modify the
activity of specific proteins. Kinases are used extensively
to transmit signals and control complex processes in cells.
More than five hundred different kinases have been identified
in humans. Their enormous diversity, as well as their role
in signaling, makes them an object of study. Various other
kinases act on small molecules such as lipids, carbohydrates,
amino acids, and nucleotides,(molecules)
either for signaling or to prime them for metabolic pathways.
(series of chemical reactions occurring
within a cell) ..." http://en.wikipedia.org/wiki/Kinases