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a
Arrangement of microtubule in centriole is 9 + 3.
b
The fimbriae are elongated tubular structures made of a special protein
c
Structure of chromosome can be best studied at metaphase.
d
Heterochromatin is genetically more active chromatin.
answer is C.
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Detailed Solution
Chromosomal structure is studied in metaphase. Centriole shows 9 + 0 arrangement. Fimbriae are short structures. Heterochromatin is inactive region of chromatin.