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3 - Cystic fibrosis: the quest for a cure page 4
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2. The CF gene and its protein Link to the Medical Research Council web site
Looking at proteins in membranes
The cell membrane is a dynamic structure in which proteins are embedded in a lipid bilayer. The CFTR protein acts as an ion channel.

Figure 6 is a transmissions electron micrograph which shows the ultrastructure of ciliated epithelium. The various organelles are labelled 1-7.

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Figure 6. Electron micrograph of cells in ciliated epithelium.

Question 3

Using the numbers on the micrograph, identify the following:

a) cilia
b) cell membrane
c) nucleus
d) rough endoplasmic reticulum  
e) Golgi apparatus
f) ribosome
g) mitochondrion

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