If the distance between two consecutive base pairs is $0.34\, nm$ and the total number of base pairs of a $DNA$ double helix in a typical mammalian cell is $6.6 \times 10^{9}$ $bp,$ then the length of the $DNA$ is approximately 

  • [NEET 2020]
  • A

    $2.7$ meters

  • B

    $2.0$ meters

  • C

    $2.5$ meters

  • D

    $2.2$ meters

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Definitions/Explanation : Histone octomer & Euchromatin
 

Cytidine is a

Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it ?

  • [AIPMT 2008]

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  • [AIPMT 1996]

A nucleoside differs from a nucleotide in not having