Question

Deoxyadenylic acid is

• A. adenosine + deoxyribose + phosphate
• B. adenine + deoxyribose + phosphate
• C. adenosine + sugar
• D. adenine + sugar

Answer 1

The correct option is B adenine + deoxyribose + phosphate

The nucleotide is the basic fundamental unit of nucleic acids and is made up of a pentose sugar, a nitrogenous base and a phosphate group.

The nucleotides of DNA are called deoxyribonucleotides as they have deoxyribose sugar as their sugar component.

When deoxyribose sugar condenses with the nitrogenous base, a nucleoside is formed.
Deoxyadenosine, deoxyguanosine, deoxycytidine and deoxythymidine are nucleosides of DNA.

When the phosphate group is attached to a nucleoside by an ester bond, a nucleotide is formed.
Deoxyadenylic acid, deoxyguanylic acid, deoxythymidylic acid, and deoxycytidylic acid are nucleotides of DNA.

So, deoxyadenylic acid is a nucleotide made up of adenine, deoxyribose sugar and phosphoric acid.