What would a vaccine have to contain to protect a patient from chicken pox? Explain why we don't have vaccines for HIV.

Describe how HIV is transmitted and how immune system cells in an infected person are affected by HIV. What are the most effective means of preventing HIV transmission? Why is AIDS particularly deadly compared with other viral diseases?

What steps are required for most B cells to become fully activated and differentiate into plasma cells?

Why is clonal selection necessary for the adaptive immune response but not the innate immune response? Select True or False for each statement.T/F The adaptive immune response uses receptors to recognizepathogens, and the innate immune response doesnot.T/F There is more receptor diversity in the adaptive immune response than in the innate immune response.T/F Cells in the innate immune response do not require activation, and those in the adaptive immune response do.T/F Clonal selection is used for targeting pathogens, and the innateimmune response is used only to stop blood flow from thewound.

Helper T cells recognize the self-nonself complex on ___________ cells, while cytotoxic T cells recognize the complex on ___________ cells.

In the condition myasthenia gravis, antibodies bind to and block certain receptors on muscle cells, preventing muscle contraction. This condition is best classified as ana. immunodeficiency disorder.b. exaggerated immune reaction.c. allergic reaction.d. autoimmune disorder.

Which of the following outcomes would be expected if somatic hypermutation did not occur?a. The diversity of pattern-recognition receptors would be significantly lowered.b. B and T lymphocytes would not be able to produce receptors thatrecognize antigens.c. The adaptive immune response would not be activated by pathogens.d. The secondary immune response to a repeat infection would produce the same antibodies as those made in the primary immune response.

Which of the following statements is not true?a. An antibody has more than one antigen-binding site.b. An antigen can have different epitopes.c. A lymphocyte has receptors for multiple and different antigens.d. A bacterium has more than one antigen.

Propose a hypothesis to explain how self-reactive B cells are identified and eliminated during maturation.