Page 3 - Lesson Notes

(A)Structure

It consists of different components:

Nuclear membrane/envelope

 Double membrane that separates the
nucleus from the cytoplasm.

 Have pores which allow only selected

materials for exchange.

Nucleoplasm

 Colorless, dense sap found inside the

nucleus

 Chromatin and nucleolus is suspended.

Nucleolus

 Rounded structure not bounded by any
membrane.

 Rich in RNA (ribonucleic acid) and protein.

 It is the site for protein synthesis.

Nuclear/chromatin material

 It contains thread like structures made of

DNA (Deoxyribonucleic acid) and protein
which condense at the time of cell division

to rod like structures called chromosomes.

 The DNA molecules contain the information
for construction and organization of cells.