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Chromosomes

The a structu...

Question

The _ (a) structure in chromatin is packed to form chromatin fibers that are further coiled and condensed at _ (b)_ stage of cell division to form chromosomes. Here, a and b are

A

chromosome, late prophase

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B

beads-on-string, metaphase

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C

nucleosome, late metaphase

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D

chromonemata, mid prophase

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Solution

The correct option is B beads-on-string, metaphase
The beads on string structure in chromatin is packed to form chromatin fibers that are further coiled and condensed at metaphase stage of cell division to form chromosomes.

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Q. Beads on string like structures of A are seen in B, which further condense to form chromosomes in C stage of cell division. Identify 'A', 'B' and 'C'

Q. Beads on string of A are seen in B which condense to form chromosomes in C stage of cell division.

Q. How many following statements are correct?
(A) Nucleus as a cell organelle was first described by Robert Brown as early as 1651.
(B) The interphase nucleus has highly condensed nucleoprotein fibres called chromatin.
(C) During different stages of cell division, cells show structured chromatin in place of the nucleus.
(D) Every chromosome essentially has a primary constriction which is also known as NOR.
(E) Many membrane-bound minute vesicles called microbodies that contain various enzymes are present in both plant and animal cells.

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