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NEET 2020

Exam: NEET
Year: 2020
Subject: Zoology
Chapter: Molecular Basis of Inheritance

NEET 2020 · Zoology · Molecular Basis of Inheritance

In the polynucleotide chain of DNA , a nitrogenous base is linked...

In the polynucleotide chain of

DNA

, a nitrogenous base is linked to the

- OH

of:

Options

A $2 ' C$ pentose sugar
B $3 ' C$ pentose sugar
C $5 ' C$ pentose sugar
D $1 ' C$ pentose sugar

Correct answer

D. $1 ' C$ pentose sugar

Step-by-step solution

$N -$ glycosidic linkage: A nitrogenous base is linked to the pentose sugar through a

N -

glycosidic linkage to form a nucleoside. Purine nucleosides have

1 ' - 9

glycosidic linkage (carbon

1 '

of pentose sugar and

9 '

nitrogen of adenine/guanine). Pyrimidine nucleosides have

1 ' - 1 '

linkage i.e., pentose sugar carbon

1 '

and

1 '

position of thymine/cytosine).

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