Chromosome

Chromatid

1-       eukaryotic chromosome

2-       Centromere - the point where the two chromatids touch

3-       Short arm

4-       Long arm

Chromatin: is the combination of DNA and other proteins that make up the contents of the nucleus.

Centriole:

Centrosome: are composed of two orthogonally arranged centrioles surrounded by an amorphous mass of protein termed the pericentriolar material.