Question
Study the given portion of double$-$stranded polynucleotide chain carefully. Identify $a, b, c$ and the $5\ '$ end of the chain.

Answer

  1. $a-$ Hydrogen bonds.
  2. $b-$ Purine base.
  3. $c-$ Pentose $($deoxyribose$)$ sugar.
  4. $d- 5\ '$ end.

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