A) Hydrogen bond
B) Covalentbond
C) Disulphide bond
D) van der Waals force
Correct Answer: A
Solution :
According to double helical model of DNA (proposed by Watson and Crick), DNA molecule contains two deoxyribonuclide chains which are spirally coiled around each other on a common axis. These two chains are held together by the formation of hydrogen bonds, \[(\underset{H-bond}{\mathop{\underset{\uparrow }{\mathop{A=T}}\,}}\,\,and\,\underset{H-bond}{\mathop{\underset{\uparrow }{\mathop{C=G}}\,}}\,).\]
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