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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm219

Which statements are correct?

  1. ARNA contains ribose and uracil in place of 2-deoxyribose and thymine.
  2. BChargaff's rule A = T and G = C applies to double-stranded DNA but not generally to single-stranded RNA.
  3. CIn semi-conservative replication each daughter duplex contains one parental strand.
  4. DIn the DNA double helix both strands run parallel, each in the 5-prime to 3-prime direction.

Answer: A, B, C

RNA differs by sugar and by U for T. Chargaff's equalities arise from base pairing between two strands and are not required for single strands. Semi-conservative replication keeps one old strand in each duplex. The strands are antiparallel, so statement 4 is false.
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