#NEET #nucleus
Nucleus structure and function | Structure and function | NEET | Bio science

cell nucleus contains all of the cell's genome, except for a small fraction of mitochondrial DNA, organized as multiple long linear DNA molecules in a complex with a large variety of proteins, such as histones, to form chromosomes. The genes within these chromosomes are structured in such a way to promote cell function. The nucleus maintains the integrity of genes and controls the activities of the cell by regulating gene expression—the nucleus is, therefore, the control center of the cell. The main structures making up the nucleus are the nuclear envelope, a double membrane that encloses the entire organelle and isolates its contents from the cellular cytoplasm, and the nuclear matrix (which includes the nuclear lamina), a network within the nucleus that adds mechanical support, much like the cytoskeleton, which supports the cell as a whole.

Endoplasmic reticulum:-
https://youtu.be/kMykFH3JOdw

Cell division:-
https://youtu.be/3eu2Rdr_CHU

Chromosomes and types:-
https://youtu.be/k_fEkOfMBP8

Lampbrush chromosomes:-
https://youtu.be/cF3o4qekHGk

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