Power Point Presentation

2. FUNCTIONS OF NUCLEUS
PRESENTED BY:
Mohsin Shad
PRESENTED TO:
DR Waseem Shahzad

3. FUNCTIONS OF NUCLEUS

4. Nuclear Membrane
Also known as nuclear envelope or
nucleolemma
separates the nuclear material from
cytoplasm
Consists of two lipid bilayers
Outer membrane
Inner membrane

5. Functions
 Shape and stability:
helps the nucleus from collapsing
 Compartmentalizing:
separates the nuclear material
from cellular material
 Regulation of substances:
allow the exchange of materials
 Communication:
develops a chemical connection
between nucleus and cell

6. Nuclear pores
 Nuclear membrane contains
thousands of nuclear pore complexes
 These are huge complexes of proteins
called nucleoporins

7. Functions of Nuclear pores
 Exchange of materials between nucleus
and cytoplasm
 Passive diffusion of low molecular weight
solutes
 Efficient passage through the complex
requires several proteins factors

8. Nucleolus
 Darkly stained body
 Factory of ribosomes
 Consists of
 peripheral granular area and central fibril
area

9. Nucleolus
FUNCTIONS:
 Site for transcription
 Assemblage of ribosomes
 Synthesis of ribosomes
 Synthesis of RNA

11. Chromosomes

12. CHROMOSOMES
 Nucleus contain thread like structures
called chromosomes
 Each chromosome composed of DNA and
proteins

13. Functions
 it controls the activities of cell
 Information in the form of genes is
located on chromosomes
 Control inheritance and metabolism

14. Chromosome Number
 SOMATIC CELLS- chromosomes occur in
pairs
 Two members-similar in shape and size-
homologus
 Diploid number-chromosomes found in
nucleus of somatic cells
 Haploid number-chromosomes found in
nucleus of germ cells