Answer:
Nucleolus is the round,
naked and as lightly irregular structure, which is attached to thechromatin at
a specific region called as Nucleolar Organizer Region (NOR)Nucleolus was first
discovered by Fontana (1781).
(i) Nucleolus
is the chief site for the ribosomal RNA synthesis.
(ii) It is
the centre for the formation of ribosome components.
(iii) It is
the colloidal complex that fills the nucleus.
(iv) It
combines r RNA with proteins to produce ribosomal sub-units. After their
formation,the ribosomes sub-units pass out and get established in the
cytoplasm.
(v) It also
receive and store ribosomal proteins formed in the cytoplasm.
(vi) These
ribosomal proteins formed are the sites' for protein synthesis in the cell.
(vii)
Nucleolus is essential for spindle formation during nuclear division.
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