Statement I: | In prokaryotes, the positively charged DNA is held with some negatively charged proteins in a region called nucleoid. |
Statement II: | In eukaryotes, the negatively charged DNA is wrapped around the positively charged histone octamer to form nucleosome. |
(a) | Euchromatin is loosely packed chromatin. |
(b) | Heterochromatin is transcriptionally active. |
(c) | Histone octomer is wrapped by negatively charged DNA in nucleosome. |
(d) | Histones are rich in lysine and arginine. |
(e) | A typical nucleosome contains 400 bp of DNA helix. |
With respect to nucleosome, Which of the following statements is incorrect ?
1. | Nucleosome contains 120 bp of DNA helix. |
2. | Nucleosomes are seen as 'beads' on string' under Electron Microscope. |
3. | DNA is wrapped around positively charged histone octamer to form nucleosome. |
4. | Nucleosome is the repeating unit of chromatin. |
Which one of the following statements about Histones is wrong?
1. | Histones are rich in amino acids - Lysine and Arginine. |
2. | Histones carry a positive charge in the side chain. |
3. | Histones are organized to form a unit of 8 molecules |
4. | Histones are organized to form a unit of 10 molecules |