a. Centromere - Centromere holds two chromatids or sister chromatids of a chromosome.

b. Cell wall – It is present only in plant cells. It gives the cell a shape and protects it from mechanical damage and from undesirable macromolecules.

c. Smooth ER – It is a major site for lipid synthesis. In animal cells, lipid-like steroidal hormones are synthesised at Smooth ER.

d. Golgi apparatus – It is an important site of formation of glycolipids and glycoproteins.

e. Centrioles - They form the base body of cilia and flagella and spindle fibres that give rise to spindle apparatus during cell division in animal cells.