In a given $DNA$ segment the number of nucleotides of guanine is $75$ and those of thymine is $75$. The total number of nucleotides in the segment will be
$75$
$750$
$225$
$300$
The diagram shows an important concept in the genetic implication of $DNA$. Fill in the blanks $A$ to $C$.
The modern concept of gene is
A child receives
Which of the following is not correct
Phosphorus is present in