what is watson and crick model of DNA?
@ keerthi : Good answer!! We really appreciate your contribution to this forum. Keep posting!
@ praveenroys007: Keerthi has provided good answer. You can refer to the image provided by her. I am adding few points on this model:
In a DNA, two polynucleotide chains are coiled to form a helix. Sugar-phosphate forms backbone of this helix while bases project in wards to each other.
Complementary bases pair with each other through hydrogen bond. Purines always pair with their corresponding pyrimidines. Adenine pairs with thymine through two hydrogen bonds while guanine pairs with cytosine through three hydrogen bonds.
The helix is right-handed.
- Pitch − 3.4 nm
- 10 bp in each turn
The plane of one base pair stacks over the other in a double helix. This provides stability to the helix along with hydrogen bonding.