NUCLEUS

Question 1

Nucleus was discovered by whom ?

Answer 1

Robert Brown

Question 2

What are the common shape of the nucleus?

Answer 2

Oval , round and kidney or bean shaped

Question 3

What is the size of the typical interphase nucleus?

Answer 3

5-25 micrometer

Question 4

What is the cell with single nucleus called? Give examples.

Answer 4

Monokaryotic cell or uninucleate cell.

For eg- human cell etc.

Question 5

What is the cell with 2 nucleus called? Give examples.

Answer 5

Dikaryotic cell or binucleate cell.

For eg- paramecium etc.

Question 6

What is the cell with many nucleus called? Give examples.

Answer 6

Multinucleated cell.
for eg- In plants and fungus – coenocytic
In animals – syncytium

Question 7

In which eukaryotic cells nucleus is absent ?

Answer 7

1. in mature mammalian RBCs

2. in mature sieve tube cells

Question 8

What are the main parts in the structure of the nucleus ?

Answer 8

Nuclear pore
Karyoplasm or nucleoplasm 
Nucleolus 
Perinuclear space
Outer and inner membrane
Chromatin network

Question 9

What is the role of nuclear pore and what is its diameter?

Answer 9

Diameter - 100-300 Angstrom

It helps in the bidirectional transport of proteins etc.

Question 10

Explain about the karyoplasm and nucleoplasm.

Answer 10

White, amorphous and colloidal

It contains chromatin net and nucleolus