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Q. No.The structure of collagen, discovered by G. N. Ramachandran, is described as:
1. A left-handed alpha helix
2. A beta pleated sheet
3. A double helix
4. A triple helix
1. A left-handed alpha helix
2. A beta pleated sheet
3. A double helix
4. A triple helix
Subtopic: Introduction to Cell |
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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 |
Subtopic: Introduction to Cell | Cell Organisation |
77%
From NCERT
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Which of the following statements can explain the fact that many scientists do not consider viruses as living organisms?
| 1. | Metabolism and growth are defining properties of living organisms. |
| 2. | Anything less than a complete structure of a cell does not ensure independent living. |
| 3. | All cells arise from pre-existing cells. |
| 4. | All biochemical reactions are catalyzed by enzymes. |
Subtopic: Introduction to Cell |
79%
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Consider the given statements:
| 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 |
Subtopic: Cell Theory |
63%
From NCERT
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The nucleus was discovered by:
1. Robert Hooke
2. Robert Brown
3. Anton Von Leeuwenhoek
4. Purkinje
1. Robert Hooke
2. Robert Brown
3. Anton Von Leeuwenhoek
4. Purkinje
Subtopic: Introduction to Cell |
89%
From NCERT
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Unicellular organisms are capable of
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | independent existence |
| II: | division |
| III: | performing the essential functions of life |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Introduction to Cell |
80%
From NCERT
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The smallest living thing capable of an independent existence is:
1. a nucleoprotein
2. a low molecular weight RNA devoid of proteins
3. a cell
4. a cluster of cells
1. a nucleoprotein
2. a low molecular weight RNA devoid of proteins
3. a cell
4. a cluster of cells
Subtopic: Introduction to Cell |
91%
From NCERT
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | In 1838, Matthias Schleiden, a German botanist, examined a large number of plants and observed that the presence of cell wall is a unique character of the plant cells. |
| Statement II: | In 1839, Theodor Schwann, a British Zoologist, studied different types of animal cells and reported that cells had a thin outer layer which is today known as the ‘plasma membrane’. |
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Cell Theory |
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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 |
Subtopic: Cell Theory |
71%
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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 |
Subtopic: Introduction to Cell |
99%
From NCERT
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