How many nucleotides are present in a small
DNA piece showing 216 angle
1) 5
2) 12
3) 18
4) 10
3. Select the incorrect statement from the
following
1) Euchromatin is said to be transcriptionally
inactive
2)Euchromatin is loosely packed
3) Heterochromatin stains darkly
4) Heterochromatin is said to be transcriptionally inactive.
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Answer:
A typical nucleosome contains 200 bp of DNA helix. Nucleosomes constitute the repeating unit of a structure in nucleus called chromatin. Chromatin is held over a scaffold of nan-histone chromosomal (or NI-K) proteins. At some places, chromatin is densely packed to form darkly stained heterochromatin. At other places, chromatin is loosely packed. it is called chromatin Chtornatin. It is transcriptionally active chromatin. Whereas heterochromatin is transcriptionally inactive and late, replicating or heteropycnotic.
So, the correct answer is 'A typical nucleosome contains 200 bp of DNA helix. Nucleosomes constitute the repeating unit of a structure in nucleus called chromatin. Chromatin is held over a scaffold of nan-histone chromosomal (or NI-K) proteins. At some places, chromatin is densely packed to form darkly stained heterochromatin. At other places, chromatin is loosely packed. it is called chromatin Chtornatin. It is transcriptionally active chromatin. Whereas heterochromatin is transcriptionally inactive and late, replicating or heteropycnotic'.
So, the correct answer is 'Statements (i) and (ii) are false, but the statement (iii) is true.'