Cell is the fundamental structural and functional unit of all living organisms. This statement can be best justified by the fact that:
1. | The cells contain nucleic acids that contain genetic information |
2. | A large number of organelles present in the cell perform various functions |
3. | Anything less than a complete structure of a cell does not ensure independent living |
4. | All multi-cellular organisms begin their life as a single celled zygote |
Statement I: | Anton von Leeuwenhoek first saw and described a live cell and Robert Brown discovered nucleus. |
Statement II: | The invention of electron microscope revealed all the structural details of the cell. |
1. | Statement I is correct and Statement II is incorrect |
2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
3. | Both Statement I and Statement II are correct and Statement II correctly explains Statement I |
4. | Only Statement II is correct |
Who concluded, based on his studies on plant tissues, that the presence of cell wall is a unique character of plant cells?
1. | Matthias Shcleiden | 2. | Theodor Schwann |
3. | J. B. S. Haldane | 4. | Rudolph Virchow |
The famous aphorism ‘omniscellula-e-cellula’ was added to the cell theory in 1855 by
1. | Matthias Shcleiden | 2. | Theodor Schwann |
3. | J. B. S. Haldane | 4. | Rudolph Virchow |
1. | Only I and II | 2. | Only I |
3. | Only II and III | 4. | Only III |
I: | bound by a single membrane only |
II: | found in all cells – both eukaryotic as well as prokaryotic |
III: | found in cytoplasm as well as chloroplasts, mitochondria and on RER |
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
1. | is a non- membrane bound organelle found in all cells which helps in cell division |
2. | is a non- membrane bound organelle found in plant cells which helps in cell division |
3. | is a non- membrane bound organelle found in animal cells which helps in DNA replication |
4. | is a non- membrane bound organelle found in animal cells which helps in cell division |
1. | Bacillus | Rod shaped |
2. | Coccus | Spherical |
3. | Vibrio | Icosahedral |
4. | Spirillum | Spiral |
Most bacteria contain plasmids that often encode for traits that are:
1. | advantageous but not essential to their bacterial host |
2. | advantageous and essential to their bacterial host |
3. | not advantageous but essential to their bacterial host |
4. | neither advantageous nor essential to their bacterial host |