The outer membrane of the nucleus:
I. is continuous with the Endoplasmic reticulum
II. does not bear ribosomes.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Nuclear envelope is derivative of
1. smooth endoplasmic reticulum
2. memebrane of Golgi complex
3. microtubles
4. rough endoplasmic reticulum
Through the nuclear pore the movement of _____and ______takes place
(1)RNA and proteins
(2)DNA and RNA
(3)DNA and proteins
(4)RNA and carbohydrates
Nucleus is absent in
1. erythrocytes of mammals
2. sieve tube cells of Vascular plants
3. Both A and B
4. Companion cells of vascular bundle
Which of the following is true about nucleolus?
(1)membrane less structure
(2)active site for rRNA synthesis
(3)numerous in cells which are involved in protein synthesis
(4)All of the above
A nuclear pore allows
(1) Unidirectional movement of DNA
(2) RNA movement only
(3) RNA and protein movement
(4) Protein movement only
The content of nucleolus is continuous with nucleoplasm
(1) Through microtubules
(2) Through nuclear pores
(3) Due to lack of membrane
(4) Due to presence of channels in membrane
1. Larger nucleoli are present in dividing cells.
2. It is a membrane-bound structure.
3. It takes part in spindle formation.
4. It is a site for active ribosomal RNA synthesis.
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