The structure of which type of DNA was proposed by Watson and Crick?
A-DNA
B-DNA
Z-DNA
G-DNA
The Watson and Crick model of DNA describes the double helix structure of B-DNA, which is the most common form of DNA in the genome. B-DNA is characterized by a right-handed helix structure and is composed of two complementary strands of nucleotides that are held together by hydrogen bonds between their base pairs. Hence, option 2 is the correct answer.