Name: Important Sources of Vitamins
Uploaded: 2019-07-19
Duration: 2 min 57 s
Description: Vitamins are essential for several biochemical reactions and the development of the body. This video describes their sources, types based on their solubility...

Question

What type of linkage holds together the monomers of D.N.A.?

Accepted Answer

DNA stands for deoxyribonucleic acid composed of deoxyribonucleotides and have $2$ -deoxyribose sugar. DNA occurs mainly in the nucleus of the cell and has a unique property of replication and transferring of heredity character.

The monomers of DNA are called nucleotides which contains three components as phosphoric acid, nitrogenous base and pentose sugar. The nucleotides are joined together by phosphodiester linkages between $5' and 3'$ carbon atoms of pentose sugar. The formation can be shown as- $5' end - phosphate \overset{}{\overset{}{\to} Sugar (base) \overset{}{\to} Phosphate \overset{}{\to} Sugar (base) \overset{}{\to} 3' end}$

Therefore, the purines present in DNA are adenine and guanine while pyrimidine bases are thymine and cytosine. In DNA, the complementary bases are adenine and thymine: guanine and cytosine. The two strands of DNA are said to be complementary to each other in the sense that the sequences of bases in one strand automatically determines that of the other. Adenine and thymine are joined together by two hydrogen bonds and cytosine and guanine are paired by three hydrogen bonds.

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Fig- Structure of DNA linked by hydrogen bond and phosphodiester linkage

What type of linkage holds together the monomers of D.N.A.?

Important Questions on Biomolecules

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