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Lac Operon

The X-shaped ...

Question

The X-shaped structure found in the nucleus by coiling of DNA before cell division is called _____ .

A

chromosome

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B

RNA

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C

nucleoid

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D

None of the above

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Solution

The correct option is A chromosome
A chromosome is the X-shaped colour body formed after coiling of negatively charged DNA around positively charged histones proteins in eukaryotes. These appear right before cell division during the interphase.

RNA is ribonucleic acid and is a genetic material comparatively less stable than DNA. It occurs as genetic material in some viruses.

The DNA is coiled and freely floating in the cytoplasm of prokaryotes. This region is called a nucleoid.

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Q. The interphase nucleus has a loose and indistinct network of nucleoprotein fibres called chromatin, but during different stages of cell division, cells show "structured chromosomes" in place of the:

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Q. How many following statements are correct?
(A) Nucleus as a cell organelle was first described by Robert Brown as early as 1651.
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(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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