Question

Which of the following bond is not present in DNA?

• A. $\beta -1^{{}^{\prime }}-9^{{}^{\prime }}-\text{N}-\text{glycosidic bond}$
• B. $\beta -1^{{}^{\prime }}-1^{{}^{\prime }}-\text{N}-\text{glycosidic bond}$
• C. $3^{{}^{\prime }}-5^{{}^{\prime }}-\text{phosphodiester bond}$
• D. $\beta –1^{{}^{\prime }}-2^{{}^{\prime }}-\text{N-glycosidic bond}$

Answer 1

The correct option is D $\beta –1^{{}^{\prime }}-2^{{}^{\prime }}-\text{N-glycosidic bond}$

$\beta -1^{{}^{\prime }}-9^{{}^{\prime }}-\text{N}-\text{glycosidic bond}\to \text{Sugar and Purines}$
$\beta -1^{{}^{\prime }}-9^{{}^{\prime }}-\text{N}-\text{glycosidic bond}\to \text{Sugar and Pyrimidine}$
$3^{{}^{\prime }}-5^{{}^{\prime }}\text{phosphodiester bond}\to \text{Sugar and Phosphate}$