Question

Who discovered the double-helical
structure of DNA? Enumerate the
detailed features of DNA double helix.Point out the differences between A-DNA and C-DNA ?
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Answer 1

ANSWER......

¤¤ Watson and Crick Discovered the double helical structure of DNA .

¤¤ DNA is a different types such as A, B, C, D, E etc.

¤¤ DNA consists of 2 polynucleotide strands arranged antiparallely as a double helix.

¤¤ In DNA, a nucleotide consists of nitrogen base, deoxyribose sugar and phosphate group.

¤¤ Backbone [strands ] of DNA is formed by the sugar - phosphate - sugar chain.

¤¤ Steps are formed of Nitrogen base pairs.

¤¤ Nitrogen bases included ADENINE (A) , GUANINE (G) , THYMINE (T) and CYTOSINE (C). Uracil absent.

¤¤ A pairs of T (A=T) by 2 hydrogen bonds.

¤¤ G pairs with C by 3 hydrogen bonds.