Future treatment for diseases, such as HIV, involves

a. the removal of receptor proteins from the cell membrane

b. blocking recognition proteins on the HIV virus

c. blocking receptor proteins in the cell membrane

d. adding recognition proteins to the cell membrane

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.