Complete Table 3.1 so that the structure of \textit{V. cholerae} can be compared with that of a human intestinal epithelial cell. Use a tick ($\checkmark$) to show that a structure is present. Use a cross ($\times$) to show that it is absent. The first row has already been filled in.
Describe the methods that can be used to prevent cholera from spreading.
Fig. 3.1 is a diagram of HIV showing the glycoprotein gp120. This glycoprotein is embedded in a membrane envelope that surrounds the viral protein coat. The glycoprotein gp120 is important because it allows HIV to infect only certain types of cell. Suggest the role of gp120.
People with HIV/AIDS have a low helper T-lymphocyte count. Explain how a low helper T-lymphocyte count could reduce the body’s ability to make antibodies against \textit{V. cholerae}.