Which one of the following cell organelles may play a role in expelling excess water and wastes in case of unicellular organisms?
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Cell Biology
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Parts of the endoplasmic reticulum adjacent to the Golgi complex are often without ribsomes and are called
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In the Golgi complex the proteins are concentrated and transformed into
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On the inner side of the nuclear envelope of many cell types is present fibrous material which has been called the
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Consider the following statements and choose the correct answer:
1. Endoplasmic reticulum synthesises secretory materials and membrane constituents
2. The lumen of ER cisternae and tubules and Golgi cisternae communicate with each other forming passage for transport of secretory proteins, lipids and sterols
3. Secretion is the main function of the Golgi complex
4. The Golgi complex participates in recycling of plasma membrane
1. Endoplasmic reticulum synthesises secretory materials and membrane constituents
2. The lumen of ER cisternae and tubules and Golgi cisternae communicate with each other forming passage for transport of secretory proteins, lipids and sterols
3. Secretion is the main function of the Golgi complex
4. The Golgi complex participates in recycling of plasma membrane
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Which thin flexible barrier separates the internal environment of the cell from the extracellular fluid?
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Match List-I with List-II and select the correct answer:
| List-I | List-II |
| a. The unit membrane model | 1. Kavanau |
| b. The mosaic membrane model | 2. Robertson |
| c. The fluid-mosaic model | 3. Singer and Nicholson |
| d. The lipid pillar model | 4. Baum |
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Consider the following statements regarding the significance of mitosis and choose the correct answer:
1. The constant number of chromosomes in all the cells of the body is because of mitosis
2. Mitosis restores the surface-volume ratio of the cell
3. A cell can grow in size to a large extent without disturbing the ratio between the nucleus and the cytoplasm
4. Repair of the body takes place because of addition of cells by mitosis
1. The constant number of chromosomes in all the cells of the body is because of mitosis
2. Mitosis restores the surface-volume ratio of the cell
3. A cell can grow in size to a large extent without disturbing the ratio between the nucleus and the cytoplasm
4. Repair of the body takes place because of addition of cells by mitosis
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The tertiary cell wall formed on the inner surface of the secondary cell wall is composed mainly of
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The main factor of evolution is
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Consider the following statements regarding supernumerary chromosomes and choose the correct answer:
1. They are not homologous with any of the normal chromosomes
2. They form synapses among themselves
3. They are generally smaller than normal chromosomes
4. They are found more commonly in plants than in animals
1. They are not homologous with any of the normal chromosomes
2. They form synapses among themselves
3. They are generally smaller than normal chromosomes
4. They are found more commonly in plants than in animals
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The scientific study of a cell is called
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When chromatin is in a partly extended state, the diameter of the beads is reduced to about 70A which are called
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Select the correct statement for nucleolus.
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According to the Singer-Nicolson fluid mosaic model, the pores may not be stable, but may be constantly appearing and disappearing. This concept is known as
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The cell walls of plants are made up of fibrils which predominantly contain
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Consider the following statements and choose the correct answer:
1. Autophagy is the digestion of endogenous material
2. Heterophagy is the intake of exogenous material into the cell and the subsequent breakdown of this material by enzymes
3. Both pinocytosis and phagocytosis require energy
4. The bulk intake of exogenous material is called exocytosis
1. Autophagy is the digestion of endogenous material
2. Heterophagy is the intake of exogenous material into the cell and the subsequent breakdown of this material by enzymes
3. Both pinocytosis and phagocytosis require energy
4. The bulk intake of exogenous material is called exocytosis
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Which of the following cell organelles is found in a cell which is very active in protein synthesis?
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Which of the following are fully capable of converting pyruvic acid to carbon dioxide and water?
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Q100
Open questionWhich one of the following organelles takes part in the formation of acrosome in human sperms?
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