8.
(a) (1) only
Read the following statements and choose the incorrect statements,
(i) Nitrogenous base is linked to the pentose sugar through a N-glycosidic linkage.
(ii) Phosphate group is linked to 5'-OH of a nucleoside through phosphoester linkage.
(iii) Two nucleosides are linked through 3'-5'N-glycosidic linkage.
(iv) Negatively charged DNA is wrapped around positively charged histone octamer to
nucleosome.
(v) The chromatin that is more densely packed and stains dark is called euchromatin.
(a) (i) only
(b)(iv) only
(c)(iii) and (v) (d) (i), (ii) and
hrough a sequence of.
Answers
Answer:
iii and v
Explanation:
Two nucleosides are linked through 1 - 4 glycosidic linkage where the bond is normally formed between the carbon 1 of one sugar and carbon 4 of other sugar. Chromatin is a substance of which eukaryotic chromosomes are composed. It consists of proteins (principally histones), DNA and small amounts of RNA. The DNA molecule is wrapped around the histones to form a series of linked globular nucleosomes, resembling beads on a string. This is itself coiled to form a highly condensed solenoid arrangement, constituting a form of chromatin called heterochromatin, which stains densely with basic stains. The genes in the solenoid can only be transcribed if the solenoid unfolds to some extent, forming an expanded chromatin (euchromatin), which is lighter staining.