The diagram below represents the general appearance of a section of the cell membrane under an electron microscope.
![F3ET1PP2Q5](https://www.easyelimu.com/images/form_3_past_papers/Term_1_2021/end_term_1_2021/F3ET1PP2Q5.PNG)
- State the possible composition of layers A and B.
- What is the significance the structure A in the membrane?
- State two properties of the cell membrane that make it efficient in its functions.
- Give two reasons why an electron microscope is useful in the study of the cell structure.