Consider the given two statements:
| Statement I: | The approximate percent composition of proteins and lipids in the cell membrane of a human erythrocyte is respectively 40% and 52%. |
| Statement II: | The measure of fluidity of a cell membrane is the ability of proteins to flip-flop between the two layers of phospholipid. |
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
In the following diagrams, each shows a section of the cell surface membrane to illustrate the fluid mosaic model. Which diagram is the most accurate?
(The black shape represents cholesterol, and the gray shape represents protein.)
| 1. | |
| 2. | |
| 3. | |
| 4. | |