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Illutstrate the structure of Watson and Crick’s model of DNA.
Illutstrate the structure of Watson and Crick’s model of DNA.
biology | Previous Year Question Papers
Illutstrate the structure of Watson and Crick’s model of DNA.

The two strands of the DNA double helix are held together in Watson and Crick’s model by hydrogen bonds between nitrogenous bases on opposite strands. Each base pair is flat, forming a “rung” on the DNA molecule’s ladder.
Base pairs aren’t made up of any old base combinations. Instead, if an A appears on one strand, it must be coupled with a T on the other strand (and vice versa). Similarly, a G on one strand must always have a C on the opposing strand as a mate. Complementary base pairs are made up of A-T and G-C combinations.

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