Which cell structure is represented in the given figure?

Considering the position of the primary constriction (centromere),how many types of chromosomes are there in living organisms?

The $Feulgen$ reaction is used to stain which of the following?

$A$ chromosome in which the $centromere$ is situated near one end is known as

The controlling centre of the cell is:

$DNA$ genetic material occurs by itself in lower organisms and combined with proteins as nucleoproteins in higher organisms. The nucleoprotein is organized in higher forms to form