How many weak $H$-bonds are formed between the purine nitrogen base Guanine and the pyrimidine nitrogen base Cytosine?

  • A
    By one weak $H$-bond
  • B
    By three weak $H$-bonds
  • C
    By two weak $H$-bonds
  • D
    By four weak $H$-bonds

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$(a)$ It is double stranded helically coiled.
$(b)$ The two strands are complementary and anti-parallel.
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One of the strands of double stranded $\text{DNA}$ has base composition as follows: $15 \% A, 15 \% T, 40 \% G$ and $30 \% C$. What will be the percentage of these bases in the complementary strand?

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