81. Which one of the following cell organelles may play a role in expelling excess water and wastes in case of unicellular organisms?
82. Parts of the endoplasmic reticulum adjacent to the Golgi complex are often without ribsomes and are called
83. In the Golgi complex the proteins are concentrated and transformed into
84. On the inner side of the nuclear envelope of many cell types is present fibrous material which has been called the
85. 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
86. Which thin flexible barrier separates the internal environment of the cell from the extracellular fluid?
87. 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
| 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 |
88. 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
89. The tertiary cell wall formed on the inner surface of the secondary cell wall is composed mainly of
90. The main factor of evolution is
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