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% |
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 |
1. | simple diffusion | 2. | facilitated diffusion |
3. | osmosis | 4. | active transport |
1. | Movement of neutral solutes along the concentration gradient. |
2. | Osmosis of water from higher to lower concentration. |
3. | Movement of polar molecules along the concentration gradient facilitated by a carrier protein. |
4. | Transport of ions against their concentration gradient. |