The modern concept of gene is

  • A
    $A$ segment of $DNA$ capable of crossing over
  • B
    $A$ functional unit of $DNA$
  • C
    $A$ segment of $DNA$
  • D
    $A$ segment of chromosome

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The sugar found in polynucleotides is either $A$ or $B$. Choose the appropriate options to fill the blanks $A$ and $B$.

How many hydrogen bonds are found between nitrogen bases in $DNA$ having $50$ nitrogen base pairs with $20$ thymine?

The diameter of each nucleosome is about:

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