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STD 12 - 5. molecular basis of inheritance — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 5. molecular basis of inheritance1 Mark
MCQ
The reason for double helical structure of $DNA$ is operation of
  • A
    Van der Waals' forces
  • B
    Dipole -dipole interaction
  • ✓
    Hydrogen bonding
  • D
    Electrostatic attractions
✓

Answer

Correct option: C.
Hydrogen bonding
c
Hydrogen bonding is involved molecular force in the $DNA$ molecule. Watson and Crick observed the purine-pyrimidine type of hydrogen bonding (instead of purine-purine and pyrimidine-pyrimidine).

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