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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
Subtopic: Introduction to Cell |
From NCERT
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Consider the given two statements:
I: No animal cell has cell wall.
II: No animal cell has centrosome.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
I: No animal cell has cell wall.
II: No animal cell has centrosome.
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: Eukaryotic Cell Orgenelle |
74%
From NCERT
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How many of the given statements are true?
1. 1
2. 2
3. 3
4. 4
| 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. |
2. 2
3. 3
4. 4
Subtopic: Cell Theory | Eukaryotic Cell Orgenelle | Lysosomes | Ribosome and Inclusion Bodies |
59%
From NCERT
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Identify the incorrect statement regarding mitochondria?
| 1. | Unless specifically stained, mitochondria are not easily visible under the microscope. |
| 2. | The number of mitochondria per cell is fixed irrespective of the physiological activity of the cells. |
| 3. | The inner membrane forms a number of infoldings called the cristae towards the matrix. |
| 4. | Mitochondria are the sites of aerobic respiration. |
Subtopic: Mitochondria |
89%
From NCERT
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Maintaining the cell's shape, providing support, and facilitating cellular movement – these are the functions carried out primarily by:
1. Cell membrane
2. Cytoskeleton
3. Nucleus
4. Endoplasmic reticulum
1. Cell membrane
2. Cytoskeleton
3. Nucleus
4. Endoplasmic reticulum
Subtopic: Cytoskeleton |
80%
From NCERT
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Consider the given two statements:
| Assertion(A): | The mitochondria, chloroplast and peroxisomes are not considered as part of the endomembrane system. |
| Reason (R): | The mitochondria, chloroplast and peroxisomes are single membrane bound organelles. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Plastids | Mitochondria | Endomembrane System |
82%
From NCERT
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Subtopic: Nucleus: Chromosomes |
85%
From NCERT
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A peroxisome is a membrane-bound organelle found in the cytoplasm of virtually all eukaryotic cells and contains several oxidases and catalases. Why type of structure is the peroxisome?
| 1. | Inclusion body | 2. | FTS-Z elements |
| 3. | Microbody | 4. | Lysosomes |
Subtopic: Microbodies |
58%
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Consider the given two statements:
| Statement I: | The outer nuclear membrane usually remains continuous with the endoplasmic reticulum and also bears ribosomes on it. |
| Statement II: | Nuclear pores are the passages through which movement of RNA from nucleus to the cytoplasm and protein molecules from the cytoplasm to the nucleus takes place. |
| 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: Nucleus |
78%
From NCERT
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Identify the incorrect statement:
| 1. | Centrosome is an organelle usually containing two cylindrical structures called centrioles. |
| 2. | Both the centrioles in a centrosome lie parallel to each other in which each has an organisation like the cartwheel. |
| 3. | Centrioles are made up of nine evenly spaced peripheral fibrils of tubulin protein where each of the peripheral fibril is a triplet. |
| 4. | The central part of the proximal region of the centriole is also proteinaceous and called the hub. |
Subtopic: Centrosomes |
79%
From NCERT
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