| Column I | Column II | ||
| A. | Nucleolar organiser | 1. | Histones \[{{H}_{2}}A\], \[{{H}_{2}}B\], \[{{H}_{3}}\] and \[{{H}_{4}}\] |
| B. | Facultative heterochromatin | 2. | Repetitive sequence of DNA |
| C. | Constitutive heterochromatin | 3. | Secondary constrictions |
| D. | 4. | Condensed chromosomes-X | |
A) A-3, B-4, C-2
B) A-1, B-4, C-3
C) A-3, B-4, C-1
D) A-1, B-2, C-3
Correct Answer: A
Solution :
An octamer of four groups of histones\[{{H}_{2}}A\], \[{{H}_{2}}B\], \[{{H}_{3}}\text{ }and\text{ }{{N}_{4}}\] complexed with DNA is elucidation of nucleosome.
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