In the $DNA$ molecule,

  • [AIPMT 2008]
  • A

    the proportion of adenine in relation to thymine varies with the organism

  • B

    there are two strands which run antiparallel­ one in $5'→ 3'$ direction and other in $3'→5'$

  • C

    the total amount of purine nucleotides and pyrimidine nucleotides is not always equal

  • D

    there are two strands which run parallel in the $5' → 3'$ direction.

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  • [AIPMT 2005]

$DNA$ polymerase links nucleotide by forming which type of bond:

  • [AIIMS 2019]