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  4. In a DNA molecule, the phosphate group is attached to carbon of the sugar residue of its own nucleotide and carbon of the sugar residue of the next nucleotide by bonds.

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Q. In a DNA molecule, the phosphate group is attached to ________ carbon of the sugar residue of its own nucleotide and_________ carbon of the sugar residue of the next nucleotide by_________ bonds.

Biomolecules

Solution:

A deoxyribonucleotide of $DNA$ is formed by crosslinking of three chemicals- deoxyribose sugar $(C_5H_{10}O_4)$, a nitrogen base and phosphoric acid $(H_3PO_4)$. The backbone of a $DNA$ strand is built up of alternate deoxyribose and phosphoric acid groups. The phosphate group is connected to carbon $5'$ of the sugar residue of its own nucleotide and carbon $3'$ of the sugar residue of the next nucleotide by phosphodiester bonds.