Which of the following is $NOT$ found in human red blood cells $(RBCs)$?

Balbiani rings (puffs) are sites of:

Protoplasm found inside the nucleus is known as

$DNA$ is not found in

The given diagram shows the types of chromosomes (labelled as $A, B, C$ and $D$) based on the position of the centromere. Which one is the correct option for the labelled chromosomes $A, B, C$ and $D$?

The nuclear envelope consists of two parallel membranes with a space between them called the perinuclear space,which is about: