FUNCTIONS OF NUCLEUS

PRESENTED BY:

Mohsin Shad

PRESENTED TO:

DR Waseem Shahzad

FUNCTIONS OF NUCLEUS

Nuclear MembraneAlso known as nuclear envelope or

nucleolemmaseparates the nuclear material from

cytoplasmConsists of two lipid bilayersOuter membraneInner membrane

FunctionsShape and stability: helps the nucleus from collapsingCompartmentalizing: separates the nuclear material from cellular materialRegulation of substances: allow the exchange of materialsCommunication: develops a chemical connection between nucleus and cell

Nuclear poresNuclear membrane contains

thousands of nuclear pore complexes

These are huge complexes of proteins called nucleoporins

Functions of Nuclear poresExchange of materials between nucleus

and cytoplasmPassive diffusion of low molecular weight

solutesEfficient passage through the complex

requires several proteins factors

Nucleolus

Darkly stained bodyFactory of ribosomesConsists ofperipheral granular area and central fibril

area

Nucleolus FUNCTIONS:

Site for transcription

Assemblage of ribosomes

Synthesis of ribosomes

Synthesis of RNA

Chromosomes

CHROMOSOMESNucleus contain thread like structures

called chromosomesEach chromosome composed of DNA and

proteins

Functionsit controls the activities of cellInformation in the form of genes is

located on chromosomesControl inheritance and metabolism

Chromosome NumberSOMATIC CELLS- chromosomes occur in

pairsTwo members-similar in shape and size-

homologusDiploid number-chromosomes found in

nucleus of somatic cellsHaploid number-chromosomes found in

nucleus of germ cells