Z

Zero Time-Binding DNA:

DNA that enters the duplex form at the start of a reassociation reaction; results from intramolecular reassociation of inverted repeats.

Zinc Finger:

A DNA binding protein structural motif. Present in many transcription factors (e.g., Sp1, Gal4). The "finger" is formed by 2-4 Cysteine residues and one zinc ion.The protein has repeated motif of amino acids with characteristic spacing of cysteines that may be invloved in binding zinc or DNA or RNA.

Zoo-Blot:

It describes the us eof Southern blotting to test the ability of a DNA probe from one species to hybridize with the DNA from the genomes of a variety of other species.

Zygote:

Individual which is produced by fusion of two gametes. It is the fertilized egg.