The linkage between two nucleotides occurs between the $3'$ carbon of the sugar of the first nucleotide and the $5'$ carbon of the sugar of the second nucleotide. Which of the following correctly represents these positions?

  • A
    $3^{rd}, 5^{th}$
  • B
    $5^{th}, 3^{rd}$
  • C
    $1^{st}, 5^{th}$
  • D
    $4^{th}, 5^{th}$

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Which of the following bonds is not present in $DNA$?

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Select the correct complementary base pairing in $DNA$.

Assertion : In a $DNA$ molecule,$A-T$ rich parts melt before $G-C$ rich parts.
Reason : In between $A$ and $T$ there are three $H-$ bonds,whereas in between $G$ and $C$ there are two $H-$ bonds.

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