explain Double-helix structure of DNA.
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Answer:
Double helix is the description of the structure of a DNA molecule. A DNA molecule consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating groups of sugar (deoxyribose) and phosphate groups.
Explanation:
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Answer:
The characteristics of the double helical structure of DNA proposed by Watson and Crick are as follows
i) The structure of DNA molecule resembles a spirally twisted ladder.
ii) It is made of two polynucleotide chains which are made of nitrogen base (Adenine, Guanine, Cytosine, and Thymine), sugar (deoxyribose sugar), and a phosphate.
iii) The two polynucleotide chains are held together by the hydrogen bonds formed between the purines and the pyrimidines (nitrogen bases)
iv) The purine A (Adenine) forms two hydrogen bonds with the pyrimidine T (Thymine) and the other purine G (Guanine) pairs with the other pyrimidine C (cytosine) via three hydrogen bonds
v) Polynucleotide chains are helically coiled and are antiparallel to each other.
v) The nitrogen bases connect the two opposite strands like the rungs of a ladder