Purines of $DNA$ are represented by

  • A
    Uracil and thymine
  • B
    Guanine and adenine
  • C
    Uracil and cytosine
  • D
    Thymine and cytosine

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State the physical structure of $DNA$.

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What is the width of a $DNA$ molecule having five turns?

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What are the structures called that give an appearance as 'beads-on-string' in the chromosomes when viewed under an electron microscope?

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