Sponsor Area

Molecular Basis Of Inheritance

Question
CBSEENBI12047481

Select the option for correct pairing of nitrogenous bases in dsDNA.

  • (Py)Adenine  = (Pu)Cytosine :: (Pu)Guanine = (Pu)Thiamine

  • (Pu)Adenine  Thiamine(Py) ::  (Py)Cytosine = (Py)Guanine

  • (Py)Adenine  (Pu)Thiamine :: (Py)Cytosine  (Pu)Guanine

  • Adenine(Pu) = Thiamine(Py) :: Guanine(Pu)  Cytosine(Py)

Solution

D.

Adenine(Pu) = Thiamine(Py) :: Guanine(Pu)  Cytosine(Py)

The bases in two strands of DNA are hydrogen bonded. A purine base bonds with a pyrimidine base. Adenine binds with thiamine of opposite strands via two hydrogen bonds. Guanine bonds with cytosine similarly via three hydrogen bonds.