Assertion (A): The two chains of DNA have anti polarity. Reason (R): In one chain of DNA, ribose sugar at 5' end consists of a free phosphate moiety while at the other end the ribose has a free 3' OH group. a) Both A and R are true and R is the b) Both A and R are true but R is not the correct explanation of A. correct explanation of A. C) Ais true but Ris false, d) Ais false but R is true.
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The correct option is A) Both A and R are true and R is the correct explanation of A.
Explanation:
- There are two strands of DNA which run in the anti- parallel direction.
- The two strands are made up of sugar and phosphate backbones.
- The first strand has a free phosphate at the 5' end of the DNA.
- The second strand has a free phosphate at the 3' end of the DNA.
- The nucleotide pair are present in between the two strands.
- Hence, the correct option is A) Both A and R are true and R is the correct explanation of A.
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- The two chains of DNA have anti polarity,
- As in one chain, the direction is 5⇒ 3, and in the other strand has the polarity of 3⇒ 5.
- The DNA strands are antiparallel, as both run in the opposite direction.
- Phosphate groups and alternate deoxyribose sugar make the backbone of a DNA chain.
- The phosphate group is connected to carbon 5' of the sugar residue of its nucleotide.
- The carbon 3'of the sugar residue of the next nucleotide by (3 ⇒5) phosphodiester bonds.
Hence the answer would be an option a)Both A and R are true, and R is the correct explanation.
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