Structure of a DNA strand: sugar-phosphate backbone and double helix

1. A.
   5' end of polynucleotide has free phosphate group.
2. B.
   Nucleic acids contain backbone formed of –C–O–C– linkage.
3. C.
   Polynucleotide has free –OH group at 3' end.
4. D.
   Neighbouring nucleotides are bonded through phosphate diester linkage.

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1. A.
   Polynucleotide strands wind into a right-handed double helix.
2. B.
   Sugar-phosphate backbone lies at inside and bases lie outside of helix.
3. C.
   Double helix is stabilized by hydrogen bonding formed in two strands.
4. D.
   A=T and G=C are complementary base pairs.

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1. A.
   Base- phosphate -sugar
2. B.
   Phosphate -base -sugar
3. C.
   Sugar -phosphate- base
4. D.
   Phosphate -sugar-phosphate

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1. A.
   Linear
2. B.
   Branched
3. C.
   Single helix
4. D.
   Double helix

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