NUCLEIC ACIDS:: PART 6

Structure of DNA by Watson and Crick

-          The 3D model of DNA was given by James.D.watson and Fransis.H.crick in 1953.

                                              

-          They said that the DNA is double stranded.

-          The two strands were antiparallel one ran from 5’ to 3’ direction and the other ran from 3’ to 5’ direction.

                                        

-          Adenine formed double bonded hydrogen bond with thymine and guanine formed triple bonded hydrogen bond with cytosine.

-          The two strands of a DNA can be represented as a step ladder folded along its imaginary axis to form a “Double Helix”.