Further Membrane Structure
Membrane Proteins and the Phospholipid bilayer
In this activity students see for themselves the wonderful interactions which occur inside cells and between cells using a short animation from Harvard university. The roles of some membrane proteins are clarified as well as the function of cholesterol in the cell membrane.
Lesson Description
Guiding Questions
What do proteins in the membrane do?
How many different types of membrane protein are there?
Activity 1 - Research activity on membrane proteins
Look at the web page on membrane proteins below. All instances of the word "Protein" have been highlighted. Make a note of all the different functions of protein on this page and for each one write a little explanation.
Activity 2 - Visualizations of proteins inside the plasma membrane
Watch the following video about the functions of cell proteins.
The following protein functions are mentioned in the video and are useful in IB Biology.
- Structural proteins
- Receptors
- Attachment sites
- Enzymes
- Signaling and communication
Harvard University selected XVIVO to develop this animation to take their cellular biology students on a journey through the microscopic world of a cell. It illustrates mechanisms that allow a white blood cell to sense its surroundings and respond to an external stimulus.
This is the first in a series of animations created for Harvard's educational website BioVisions.
Watch the 
Amazing 3D animation of proteins inside the cell and in the membrane (Inner life of the Cell)
showing a white blood cell inside a blood vessel.
Answer the questions on the 
Membrane video student worksheet .
Teachers notes
The first activity is intended as an introduction and students would benefit greatly from another source of information about membrane proteins, their position and variety, e.g. an IB Biology text book.
The second activity is quite a challenging video with many long protein names which don't help students confidence. However the worksheet has some clear questions which helps students to extract the essential information from this excellent video from Harvard university without taking away the wonderful 3D visualisations of cell organelles and the many functions of proteins.
Answers to the questions can be found on this page: 
Answers to the membrane protein video questions
If you are looking for something a little simpler,
There is a nice Summary animation about membranes from TedEd