Development of AIDs vaccine is difficult because; Select one: A. HIV undergoes reverse transcription B. HIV undergoes mutation at a rapid rate C. HIV binds to a host cell and release its genetic mater into the cell D. HIV infected CD4cells are eventually destroyed Low concentration of HIV is found in, Select one: A. Semen secretions B. Saliva C. Blood D. Breast milk

The correct answer for the first question is B. HIV undergoes mutation at a rapid rate.<br /><br />The development of an AIDS vaccine is difficult primarily because HIV undergoes mutation at a rapid rate. This high mutation rate allows the virus to constantly change its genetic makeup, making it challenging for the immune system and vaccines to effectively target and neutralize the virus.<br /><br />For the second question, the correct answer is B. Saliva.<br /><br />Low concentration of HIV is found in saliva. While HIV can be present in various bodily fluids, such as semen, blood, and breast milk, the concentration of the virus in saliva is generally lower compared to these fluids. It is important to note that HIV transmission through saliva is extremely rare, and the risk of contracting HIV from saliva is minimal.