Explain the role of scientist :
$1.$ Watson and Crick $(1953)$
$2.$ Erwin chargaff
proposed a very simple but famous Double Helix model for the structure of $DNA$.
Erwin Chargaff that for a double stranded $DNA$ , the ratios between Adenine and Thymine and Guanine and Cytosine are constant and equals one.
Which of the following is correct for Watson and Crick's model of $DNA$. It is duplex with
In a typical nucleosome if Adenine are $10$ then how many Guanine are present ?
If the sequence of one strand of $DNA$ is $5^{\prime}$ $A T G C A T C G 3'$ , find the sequence of complementary strand in $5^{\prime} \rightarrow 3^{'}$ direction
Assertion : Histones are basic proteins of major importance in packaging of eukaryotic $DNA$. $DNA$ and histones comprise chromatin forming the bulk of eukaryotic chromosome.
Reason : Histones are of five major types $H_1,\,H_2A\,, H_2B,H_3$ and $H_4$ .
Purines found both in $DNA$ and $RNA$ are