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 |
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Given below are two statements: 
 
Assertion (A): It is important that the organisms should have cells.
Reason (R): A cell keeps its chemical composition steady within its boundary.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Introduction to Cell |
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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 |
From NCERT
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How many of the given statements are true?
I: All cells arise from pre-existing cells.
II: Prokaryotic cells do not have any organelles.
III: Eukaryotic cells have only membrane bound organelle.
IV: Centrosome helps in cell division in plants and animals.
1. 1
2. 2
3. 3
4. 4
Subtopic:  Cell Theory | Eukaryotic Cell Orgenelle | Lysosomes | Ribosome and Inclusion Bodies |
 58%
From NCERT
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Consider the given two statements:
Statement I: Rudolph Virchow proved that all life comes from pre-existing life.
Statement II: Louis Pasteur proved that all cells arise from pre-existing cells
1. Statement I is True; Statement II is True
2. Statement I is True; Statement II is False
3. Statement I is False; Statement II is True
4. Statement I is False; Statement II is False
Subtopic:  Cell Theory |
From NCERT
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Bacterial flagella differ from eukaryotic flagella in that they:
1. Are primarily used for sensory purposes
2. Are composed of microtubules
3. Are enclosed in the cell wall
4. Rotate rather than whip
Subtopic:  Cilia & Flagella |
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Ribosomes are the site of protein synthesis. Identify the correct statement:
I: Several ribosomes may attach to a single mRNA and form a chain called polyribosomes or polysome.
II: The ribosomes of a polysome translate the mRNA into different proteins.
 
1. Only I 2. Only II
3. Both I and II 4. Neither I nor II
Subtopic:  Ribosome and Inclusion Bodies |
From NCERT
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Regarding the genetic material in prokaryotes:
I: The main chromosomal DNA is linear
II: Plasmid DNA is circular
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic:  Details of Prokaryotic Cell Structure |
 60%
From NCERT
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Consider the two statements:
Statement I: Besides flagella, Pili and Fimbriae are also surface structures of the bacteria but do not play a role in motility.
Statement II: Pili and fimbriae help attach the bacteria to rocks in streams and also to the host tissues.
 
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:  Details of Prokaryotic Cell Structure |
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Identify the correct statement regarding the part of a cell, the structure of which is shown in the given diagram:

1. It is not found in the plant cells
2. It serves to provide an attachment with a surface for a bacterial cell
3. The structure is made of a protein called flagellin
4. It can be used for movement by a eukaryotic cell
Subtopic:  Cilia & Flagella |
From NCERT
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