How many hydrogen bonds are present between Guanine and Cytosine?

$A$ distinct mechanism that usually involves a short segment of $DNA$ with a remarkable capacity to move from one location in a chromosome to another is called:

Who proposed the following statement?
"It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material."

In the structure of $DNA$,which component of the nucleotide is located towards the inside,perpendicular to the main axis?

What is the ratio of purine to pyrimidine bases in each molecule of $DNA$?

How many nucleotides are present in one turn of $DNA$ helix (in $pairs$)?