Nucleolus
Nucleolus
The nucleolus is a region found with in the cell nucleus that is concerned with producing and assembling the cell's ribosomes. Following assembly, ribosomes are transported to the cell cytoplasm where they serve as the sites for protein synthesis.
Structure of Nucleolus :-
In eukaryotic cells, nucleolus has a well ordered structure with four main ultrastructural components. The components can be further identified as :
Fibrillar Centers :- It is the place where the ribosomal proteins are formed,
Granular Components :- Before ribosomes are formed, these components have r RNA that binds to ribosomal proteins.
Dense Fibrillar Components :- It has new transcribed RNA, which connects to the ribosomal proteins.
Nucleolar Vacuoles : It is present only in plant cells.
The ultrastructure of the nucleolus can be easily visualized through an electron microscope.
Function of Nucleolus :-
Ribosome formation or biogenesis of ribosomes.
Synthesis and storage of of RNA :-
It produces 70 -90 % of cellular RNA in many cells. It is source of RNA. The chromatin in nucleolus contains genes or ribosomal DNA(rDNA) for coding ribosomal RNA. Chromatin containing DNA gives rise to fibrils containing RNA. Granules containing RNA already produces ribosomes.
Protein synthesis :-
Nucleolus is also said to be involved in synthesis of proteins.
The dark spot like structure that helps to make ribosomes is called ____________ | |||
| Right Option : D | |||
| View Explanation | |||
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