The structure present inside the nucleus responsible for ribosomal unit formation is

The thread-like structures present in the nucleus are

The thread-like structures present inside the nucleus that are visible only during cell division are known as

The structural unit present in pyrosilicates is:

The structural unit present in pyrosilicates is:

The number of protons present inside the nucleus of an atom is called

Structure responsible for formation of sigmoid notch is

Explain the structure of the organ responsible for sperm formation.