Essential idea: The structure of biological membranes makes them fluid and dynamic. | |
Q1-5: These questions refer to this diagram of a cell membrane: |
|
1. The thickness of the cell membrane (Z) is:
|
|
2. The molecules making up the two layers in Z are:
| |
3. Molecule T is ...
|
|
4. The phospholipid molecules are described as amphipathic. This means that ...
|
|
5. Which structure reduces the fluidity of the membrane?
|
|
6. Using Electron micrographs The Davson-Danielli model of membrane structure was formulated in the 1950s.
What did the Davson-Danielli model of membrane structure suggest?
| |
7. Which of the following pieces of evidence falsified the Davson-Danielli model of the structure of the cell membrane and lead scientists to adopt the Singer-Nicolson model? I. Globular structures scattered through freeze-etched images of the centre of membranes. |
|
| |
8. The function of the cell membrane is to form a barrier through which ions and hydrophilic molecules cannot easily pass.
Which molecules carry out this function?
| |
9. Which of the following helps maintain the structure of the cell membrane?
|
|
10. Animal cells may secrete glycoproteins as extracellular components. What is the role of these glycoproteins?
|
|