Read the following statements regarding the structure of DNA and mark the appropriate option.
i) A DNA molecule is made of two polynucleotide chains with anti parallel polarity and both strands are coiled in a right-handed fashion.
ii) In each poly nucleotide strand, two consecutive nucleotides are linked through 3'-5' phosphodiester linkage .
iii) A polymer thus formed has at one end a free phosphate moiety at 5'-end of sugar, referred to as 5’-end of polynucleotide chain. Similarly at the other end of the polymer the sugar has a free OH of 3'C group which is referred to as 3' -end of the polynucleotide chain.
(iv) the backbone of each strand constituted by sugar-phosphate, and the bases project inside

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All statements are incorrect

All statements are correct

Statement II and IV are incorrect

Statement I and IV are incorrect

answer is D.

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Detailed Solution

A DNA molecule is made of two polynucleotide chains with anti parallel polarity and both strands are coiled in a right-handed fashion. In each poly nucleotide strand, two consecutive nucleotides are linked through 3'-5' phosphodiester linkage .

A polymer thus formed has at one end a free phosphate moiety at 5'-end of sugar, referred to as 5’-end of polynucleotide chain. Similarly at the other end of the polymer the sugar has a free OH of 3'C group which is referred to as 3' -end of the polynucleotide chain. The backbone of each strand constituted by sugar-phosphate, and the bases project inside

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