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
Subtopic:  Introduction to Cell |
From NCERT
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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 |
 78%
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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
Subtopic:  Introduction to Cell |
 89%
From NCERT
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Unicellular organisms are capable of
I: independent existence
II: division
III: performing the essential functions of life
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
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
Subtopic:  Introduction to Cell |
 91%
From NCERT
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Consider the given two statements:
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’.
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
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%
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