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Q. No.Nucleus as a cell organelle was first described by:
1. Robert Brown
2. Robert Hooke
3. Rudolph Virchow
4. Flemming
Subtopic: Introduction to Cell |
93%
From NCERT
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Nuclear pores:
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: | are formed by the fusion of the two nuclear membranes at some places. |
| II: | are the passages through which movement of RNA and protein molecules takes place in both directions between the nucleus and the cytoplasm. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Nucleus |
86%
From NCERT
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In eukaryotic cells, the term "nuclear envelope" is more correct than the term "nuclear membrane" for the enclosure around nucleus because:
| 1. | the enclosure has pores which membranes do not |
| 2. | the enclosure is made up of two membranes |
| 3. | the chemical composition is inconsistent with cellular membranes |
| 4. | the enclosure does not enclose the nucleolus |
Subtopic: Nucleus |
From NCERT
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When compared to eukaryotic cells, prokaryotic cells:
1. are smaller and generally divide at a slower rate.
2. are smaller and generally divide at a faster rate.
3. are smaller and generally divide at a similar rate.
4. are larger and generally divide at a slower rate.
1. are smaller and generally divide at a slower rate.
2. are smaller and generally divide at a faster rate.
3. are smaller and generally divide at a similar rate.
4. are larger and generally divide at a slower rate.
Subtopic: Prokaryotic Cell Organisation |
91%
From NCERT
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What will not be true regarding the centrioles present in a centrosome?
| 1. | Two centrioles are contained in a centrosome. |
| 2. | The centrioles are surrounded by amorphous pericentriolar materials. |
| 3. | Both centrioles in a centrosome lie parallel to each other. |
| 4. | Both centrioles in a centrosome have an organisation like the cartwheel |
Subtopic: Centrosomes |
88%
From NCERT
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Both the cilium and the flagellum emerge from centriole-like structure called the:
1. basal body
2. kinetoplastid
3. phragmoplast
4. kinocilium
1. basal body
2. kinetoplastid
3. phragmoplast
4. kinocilium
Subtopic: Cilia & Flagella |
97%
From NCERT
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Arrangement of axonemal microtubules in a eukaryotic flagellum is referred to as the:
1. 9+2 array
2. 9+0 array
3. 9+9 array
4. 9+1 array
1. 9+2 array
2. 9+0 array
3. 9+9 array
4. 9+1 array
Subtopic: Cilia & Flagella |
93%
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Identify the correct statements regarding mitochondria:
1. a and b
2. c and d
3. a and c
4. b and d
| a. | Mitochondria are easily visible under the microscope without any staining. |
| b. | The number of mitochondria per cell is always fixed irrespective of the physiological activity of the cells. |
| c. | Mitochondria are the sites of aerobic respiration. |
| d. | Mitochondria divide by fission. |
1. a and b
2. c and d
3. a and c
4. b and d
Subtopic: Mitochondria |
92%
From NCERT
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Which of the following will be applicable to the description of smooth endoplasmic reticulum?
| a. | Frequently observed in the cells actively involved in protein synthesis and secretion |
| b. | Extensive and continuous with the outer membrane of the nucleus |
| c. | The major site for synthesis of lipid |
| d. | Synthesis of lipid-like steroidal hormones in animal cells |
| 1. | a and b | 2. | c and d |
| 3. | a and c | 4. | b and d |
Subtopic: Intro to Endomembrane System: Endoplasmic Reticulum | Endomembrane System (Endoplasmic Reticulum) |
92%
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The number of correct statements regarding the structure of a typical animal cell membrane is:
1. 2
2. 3
3. 4
4. 5
| I: | It is mainly composed of lipids and proteins. |
| II: | The major lipids are phospholipids, that are arranged in a bilayer. |
| III: | The lipids are arranged within the membrane with the hydrophobic head towards the outer sides and the polar tails towards the inner part. |
| IV: | In addition to phospholipids, membrane also contains cholesterol. |
| V: | Peripheral proteins lie on the surface of membrane while the integral proteins are partially or totally buried in the membrane |
1. 2
2. 3
3. 4
4. 5
Subtopic: Cell Membrane |
76%
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