Dictionary of Chemistry [6th Ed.]

teine molecules (see amino acid).

This often occurs between adjacent

cysteine residues in polypeptides.

The resultant disulphide bridges

(–S–S–) are important in stabilizing

the structure of protein molecules.

cytidineA nucleoside comprising

one cytosine molecule linked to a d-

ribose sugar molecule. The derived

nucleotides, cytidine mono-, di-, and

triphosphate (CMP, CDP, and CTP re-

spectively) participate in various bio-

chemical reactions, notably in

phospholipid synthesis.

cytochrome Any of a group of

proteins, each with an iron-contain-

ing *haem group, that form part of

the *electron transport chain in mi-

tochondria and chloroplasts. Elec-

trons are transferred by reversible

changes in the iron atom between

the reduced Fe(II) and oxidized Fe(III)

states.

cytosineA *pyrimidine derivative.

It is one of the principal component

bases of *nucleotides and the nucleic

acids *DNA and *RNA.

cytidine 160

c

 



 

Cytidine



Cytosine

CZSee cubic zircona.

CZECapillary zone electro-

phoresis. See capillary elec-

trophoresis.