Q. No.Cell theory, as understood today, is:
I. All living organisms are composed of cells and products of cells
II. Cells of living organisms may or may not have cell walls
III. All cells arise from pre-existing cells
1.
Only I and II
2.
Only I and III
3.
Only II and III
4.
I, II and III
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I. a membrane bound nucleus
II. membrane bound organelles
III. ribosomes
| 1. | Only I and II | 2. | Only I |
| 3. | Only II and III | 4. | Only III |
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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 |
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| 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 |
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| 1. | Bacillus | Rod shaped |
| 2. | Coccus | Spherical |
| 3. | Vibrio | Icosahedral |
| 4. | Spirillum | Spiral |
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| 1. | 0.1 to 0.3 µm | 2. | 0.02 to 0.3 µm |
| 3. | 1 to 10 µm | 4. | 1 to 2 µm |
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1. a single chromosome and circular DNA
2. multiple chromosomes and circular DNA
3. a single chromosome and linear DNA
4. multiple chromosomes and liner DNA
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I. The outermost layer of the cell envelope is called as the glycocalyx which may be present as a loose sheath called the slime layer or a thick and tough capsule.
II. The cell wall determines the shape of the cell and provides a strong structural support to prevent the bacterium from bursting or collapsing.
III. Plasma membrane is selectively permeable in nature and interacts with the outside world.
IV. Bacterial cells can be classified as Gram positive and Gram negative based on the staining properties of their plasma membrane.
| 1. | All except IV | 2. | Only I and II |
| 3. | I, II, III and IV | 4. | Only II, III and IV |
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| 1. | several mRNA molecules attached to a ribosome |
| 2. | several ribosomes attached to a single mRNA |
| 3. | the three major types of cellular RNAs attached to an mRNA molecule |
| 4. | many ribosomes attached to the surface of endoplasmic reticulum |
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