Nucleus

12TH PHYSICS

Nucleus heriditary organelles
General structure of the nucleus
It is the largest organelle seen clearly when the cell is not dividing it stands deeply is mostly sperical WBC have loved nuclear it is mostly one in each cell uninucleate some cells have many nuclei multinucleate
Double layered nuclear membrane having fine nuclear force and clauses nucleoplasm which contains chromatin Network and nucleolus
Functions
Maintenance the cell in a working order co-ordinate the activities of other cell organelles takes care of repair work participates directly in cell division to produce genetically identical daughter cells this division is called mitotic cell division participates in production of payments and sports through another type of cell division called Matrix cell division
The parts of A nucleus are given here –
Nuclear membrane double layered membrane is interrupted by large number of nuclear force membrane is made up of lipids and proteins like plasma membrane and has ribosomes attached on the outer membrane which make the outer membrane rough
The ports allow the transport of large molecules in and out of nucleus and the cell membranes keep the heriditary material in contact with the rest of the cell
Chromatin
Within the nuclear membrane there is Jelly like substance carrier lamp or nuclear plant rich in proteins
N Kariyo lamp structures form a network called chromatin fibrils which gets condensed to form distinct body is called chromosomes during cell division on staining the chromosomes two regions can be identified in the chromatin material heterochromatin dark and euchromatin light heterochromatin has heavily called DNA and genetically less reactive than euchromatin which has hackley and cold DNA and genetically more active the number of chromosomes is fixed in an organism during mitotic cell division chromosomes divide in a manner that the daughter cells receive identical amounts of heriditary matter
Nucleolus membrane less steroidal bodies present in all Eukaryotic cells except in sperms and in some algae
Dear number varies from one to few They Stand uniformly and deeply it has DNA RNA and proteins store house for RNA and protein it disappears during early phase of cell cycle and reappears after 3 phase in the newly formed daughter nuclei regulate the synthetic activity of the nucleus nucleus and cytoplasm are interdependent and this process is equal to nucleocytoplasmic interaction

Leave a Reply

Your email address will not be published. Required fields are marked *