Question

IV. Short answer questions
4. How many kinds of nitrogenous bases are present in nucleic acids?
5. How is a nucleotide formed?
6. Differentiate between a nucleotide and a nucleoside.

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Answer 1

Answer:

1)...Four different types of nitrogenous bases are : adenine (A), thymine (T), cytosine (C), and guanine (G).

2)..A nucleotide is formed from a carbohydrate residue connected to a heterocyclic base by a β-D-glycosidic bond and to a phosphate group at C-5' (compounds containing the phosphate group at C-3' are also known). The molecules derived from nucleotides by removing the phosphate group are the nucleosides.

3)...“A building block of DNA or RNA- nucleotide is made up of the sugar, nitrogenous bases, and phosphate while the nucleoside is made up of sugar and base only.”

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Answer 2

Answer:

4. In DNA , there are 4 types of NB - Adenine , Thymine , Guanine and Cytosine

In RNA , there are also 4 - Adenine , Guanine , Cytosine and Uracil

5. Nucleotide is formed when nucleoside joins with phosphate grp

6. Nucleotide is formed from Nucleoside

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