Question

explain about nucleolus

Answer 1

Explanation:

The nucleolus is the distinct structure present in the nucleus of eukaryotic cells. Primarily, it participates in assembling the ribosomes, alteration of transfer RNA and sensing cellular stress. The nucleolus is composed of RNA and proteins which form around specific chromosomal region

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Answer 2

Nυcłєσłυs :

It is a membrane less darkly stained rounded structure present in the nucleoplasm , also known as plasmosome .

• The content of nucleolus is continues with the rest of the nucleoplasm .

• Nucleus may contain one or two or many nucleoli.

• Nucleolus was first observed by Fontona .

• Nucleolus develops from nucleolar organizer which is the secondary constriction of the nucleolar organizing chromosomes .

• Larger and more numerous nucleoli are present in cells actively carrying out protein synthesis.

• Nucleolus disappears during prophase and reappears during telophase during cell division.

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Composition :

It contains central fibrillar part comprising RNA , proteins and a little amount of DNA and peripheral granular part made up of proteins and RNA .

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It is site for ribosomal RNA synthesis.

They produce ribosomes hence nucleus is considered as Ribosomal factory .

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