Question

Find the incorrect statement :
1) N - glycosidic linkage between nitrogenous base and sugar forms a
nucleoside
2) 5 - methyl uracil is present in DNA
3) In RNA, every nucleotide residue has additional OH group.
4) The ratio (A +T/G + C) is constant.​

Answer 1

Answer:

3)

In RNA, every nucleotide residue has additional OH group.

like plssss

Answer 2

Explanation:

12th

Biology

Molecular Basis of Inheritance

The DNA

Choose the correct answer f...

BIOLOGY

Choose the correct answer from the alternatives given :

In a DNA strand the nucleotides are linked together by

A

Glycosidic bonds

B

Phosphodiester bonds

C

Peptide bonds

D

Hydrogen bonds

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ANSWER

A nucleotide has three components - nitrogenous base, a pentose sugar ribose in case of RNA and deoxyribose for DNA) and a phosphate group. There are two types of nitrogenous bases - Purines (Adenine and Guanine) and Pyrimidines (Cytosine and Thymine). A nitrogenous base is linked to the pentose sugar through a N-glycosidic linkage to form a nucleoside. When a phosphate group is linked to 5 -OH of a nucleoside through phosphodiester linkage, a corresponding nucleotide is formed. The nucleotides are linked through 3-5 phosphodiester linkage to form a dinucleotide.

So, the correct answer is 'Phosphodiester bonds'.

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