The double-helical structure of $DNA$ is due to the action of . . . . . . .

  • A
    Van der Waals forces
  • B
    Dipole-dipole attraction
  • C
    Hydrogen bonding
  • D
    Electrostatic attraction

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The $AT/GC$ ratio in human beings is (where $A = \text{adenine}$,$T = \text{thymine}$,$G = \text{guanine}$,$C = \text{cytosine}$)

What is the total number of $-OH$ groups present in a nucleoside involved in the formation of $DNA$?

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