Out of the following isomeric forms of uracil,which one is present in $RNA$?

  • A
    $2,4-$dihydroxypyrimidine
  • B
    $4-$hydroxy$-2-$oxopyrimidine
  • C
    $2-$hydroxy$-4-$oxopyrimidine
  • D
    $2,4-$dioxopyrimidine (uracil)

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$DNA$ consists of two polynucleotide chains. Each chain forms a right-handed spiral with how many bases in one turn of the spiral?

An alteration in the base sequence of a nucleic acid molecule is called:

Two nucleotides are joined together by a linkage known as:

What is the total number of $-OH$ groups present in a nucleoside involved in the formation of $DNA$?

Which of the following is not a constituent of nucleic acids?

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