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Consider the following statements and select the option that correctly fills the blank:
(I) The interphase nucleus has a loose and indistinct network of nucleoprotein fibres called _A_
(II) Primary constrictions of chromosomes are also called _B_.
(III) A part of chromosome beyond non- staining secondary constriction is called _C_
(IV) Kinetochores are _D_ structure.
A B C D
1. chromatin primary constriction centromere disc shaped
2. chromosomes kinetochores primary constriction fibrillar
3. chromatin centromere satellite disc shaped
4. chromosomes primary constriction satellite spindle shaped

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answer is C.

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Detailed Solution

The interphase nucleus has a loose and indistinct network of nucleoprotein fibres called chromatin.
Every chromosome essentially has a primary constriction or the centromere on the sides of which disc shaped structures called kinetochores are present.
Few chromosomes have non-staining secondary constrictions at a constant location. This gives the appearance of a small fragment called the satellite.

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