Question

A nucleoside differs from a nucleotide. It lacks the:
a. base
b. sugar
c. phosphate group
d. hydroxyl group


NCERT Class XII
Biology - Main Course Book

Chapter 6. Molecular Basis of Inheritance

Answer 1

A nucleoside lacks the
c. phosphate group

Answer 2

A nucleoside differs from a ‘nucleotide’. It lacks the Phosphate group.

Option: (c)

Explanation:

• Nucleotide is the ‘building block of DNA’. It is made up of a base, a ‘sugar’ and a phosphate.

• The base is either a ‘purine’ (adenine, guanine) or a ‘pyrimidine’ (thymine, cytosine).  

• Nucleoside is also the ‘building block of DNA’. It is made up of a nitrogenous base which is covalently attached to a sugar.  

• Nucleoside differs from nucleotide in that it does not have a ‘phosphate group’. A nucleoside bound to a phosphate group is known as a nucleotide.

Learn more about nucleotide

The conformation of a nucleotide in DNA is affected by rotation about how many bonds? 1. 4 2. 6 3. 7 4. 3

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Enlist the components of a nucleotide.

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