The cell nucleus

BASIC INFORMATION

1. THE CELL NUCLEUS (BASIC) Presented By: Hina Amir .

2. The Cell Nucleus Introduction Cell is a fundamental component of life containing different organelles. Nucleus ―A cell organelle. It is known as nerve center or control center of cell.

3. Size And Shape It is a spherical organelle. Accounts 10 ٪ of cell’s volume. It ranges from 2-5 micron meter in diameter.

4. Discovery It was discovered by A .V Leeuwenhoek for first time. Franz Bauer in 1802 also described it. Scottish botanist Robert Brown explained it in more detail. After that it was concluded that it is a membrane bounded organelle found in eukaryotic cells.

5. Structure Of Nucleus Nuclear membrane. Nuclear pores. Nuclear lamina. Chromosomes. Nucleolus.

6. Nuclear membrane It is two layered. With 10-50nm separation. Prevent genetic material. Form nuclear pores.

7. Nuclear pores Have 100nm diameter. Human cell have 3000-4000 nuclear pores. Help in nuclear transport.

8. Nuclear lamina. Intermediate filaments. Mechanical support. Lamin protein.

9. Chromosomes Genetic material. Heterochromatin- highly condensed. Euchromatin- less condensed.

10. Nucleolus Discrete densely stained structure. Synthesize rRNA and assemble ribosomes. Disappear when cell divide.

11. Functions of Nucleus Storage of hereditary material. Storage of proteins and RNA. Production of ribosomes. Transport of hereditary material to the rest of cell. Prevention.