- 1(current)
Q. No.The approximate percent composition of proteins and lipids in the cell membrane of an erythrocyte is respectively:
| 1. | 52% and 40% | 2. | 40% and 52% |
| 3. | 60% and 40% | 4. | 40% and 60% |
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I. The lipid component mainly consists of phosphoglycerides.
II. Peripheral proteins are either lying on the surface of the membrane or partially buried in it.
III. Carbohydrates are not a component of cell membrane.
IV. Cholesterol is a lipid and is a part of the cell membranes of animal cells.
| 1. Only I | 2. II and III only |
| 3. I and IV only | 4. II and IV only |
I: A is a major component of animal plasma membranes and it regulates the fluidity of the overall membrane.
II: B are integral proteins and C is an extrinsic protein.
III: D is the hydrophobic head of the phospholipid and E is its hydrophilic tail.
IV: F is a carbohydrate found only on the outer surface of the membrane.
| 1. Only I, II, and III | 2. Only I, II, and IV |
| 3. Only II, III, and IV | 4. I, II, III and IV |
Keeping in view the fluid mosaic model for the structure of cell membrane, which one of the following statement is correct with respect to movements of lipids and proteins from one lipid monolayer to the other (described as flip flop movement) ?
1. While proteins can flip-flop, lipids cannot
2. Neither lipids nor proteins can flip-flop
3. Both lipids and proteins can flip-flop
4. While lipids can rarely flip-flop, proteins cannot
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- 1(current)
Q. No.
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