Q6.Presence of nucleus is essential for maintenance and working of the cells, so nucleus is commonly called as the ‘Director of a cell’. Answer the following questions: [a] Give the term for the cells having incipient nucleus. [b] Name two cell types having no nucleus. 3 Marks
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(A)
Incipient nucleus often called as nucleoid refers to immature nucleus of prokaryotes. Bacterias have an extra-chromosonal ring in addition to the nucleoid called as plasmid.
(B)
Some cell types that have no nucleus are as follows :
human red blood cells,
platelets and
single-celled prokaryotic bacteria such as Eubacteria and Archaebacteria.
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