2. Basics of Nucleus Nucleus was discovered by an English biologist Robert Brown in 1831. It is the most important part of the cell, exerting a controlling influence on all cell activities. It is usually spherical or oval structure mostly located in the centre of the cell Some sieve tubes of vascular plants and the red blood cells of mammals lack nuclei at maturity.
3. Structure of the Nucleus Nuclear membrane Nucleoplasm Nucleolus Chromatin Material
4. Structure of the Nucleus (cont.) Nuclear Membrane: Nuclear Membrane separates the nucleus from the cytoplasm. It is mainly made up of protein and lipids. Nucleoplasm- Nucleoplasm is the cytoplasm of within the nuclear membrane in which the chromatin and nucleoli is suspended. Nucleolus- Nucleolus is usually one spherical body. It lacks a membrane. It is rich in protein and RNA (Ribonucleic acid) Chromatin material- It mainly consists of DNA (Deoxyribonucleic acid). Its main function is to carry hereditary information from one generation to another.
5. Functions of the Nucleus Nucleus is the chief controlling centre of the cell it contains genes and chromosomes. Nucleus contains metabolic activities taking place in the cell. Cellular metabolic activities are controlled by enzymes. Synthesis and regulations of activities of enzymes are controlled by the nucleus
6. Worked cited A new approach to I.C.S.E Biology. Dr. S.K Aggravall 2009
