Question

Chromatin can be tightly compacted rendering it inaccessible to RNA polymerases and effectively transcriptionally silent. This...

Chromatin can be tightly compacted rendering it inaccessible to RNA polymerases and effectively transcriptionally silent. This form of chromatin is called ______.

Select one:

a. Heterochromatin

b. Euchromatin

c. Mute chromatin

d. Silent chromatin

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Answer #1

Some of the DNA in eukaryotes is very tightly packed or densely packed. This causes the DNA to be inaccesible by RNA polymerases and prevent transcription of this tightly coiled DNA. Also this chromatin stains dark coloured when stained by Giemsa stain. This tighly packed chromatin is called heterochromatin and plays a major role in gene expression in eukaryotes. Also some heterochromatin can be facultative heterochromatin and can become transcritpionally active under certain conditions.

So, correct answer is (A) Heterochromatin

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