explain in detail how a B cell gets activated (clonal selection and proliferation) How are T helper cells involved? Cytokines? Where might a B-cell most likelycome in to contact with its antigen? How did that antigen likely get there? What are memory cells?

In the process shown in Diagram 2, what performs the function most similar to that of the activated T cell in Diagram 1?

Immature B cells arriving in the spleen turn over rapidly and require cytokines and positive signals through the B-cell receptor for maturation and long-term survival.  Marginal zone B cells are thought to represent a lineage of cells important in rapid responses to blood-borne antigens. What are the two characteristics of these cells that indicate this function?

True or false B cells are responsible for cellular immunity Cytotoxic t cells recognize class 1 MHCs

Where do B-cells proliferate and mature? Group of answer choices Thymus Red bone marrow Liver Small intestine

What types of cells produce antibodies? B cells Omemory T cells macrophages antigen presenting cells killer T cells

What type of B cell would interact with a T cell and what would result from the interaction

Which of the following cell types can directly regulate B cell activation and differentiation? 單選: A. Th1 cells B. Th2 cells C. Dendritic cells D. Macrophages E. Cytotoxic T cells O O O O

Antibodies are able to dispose of antigens In which of the following ways? )Neutralization Opsonization O Complement activation O Enhanced NK cell activity All of the above

New Skin' research center uses mice for studies of skin grafting. To prevent rejection of the graft, the mice are thymectomized (taking out thymus) at birth. Even though B cells do not develop in the thymus, these mice show no humoral immune response and are very susceptible to infection. Explain why the removal of the thymus would improve the success of skin grafts but adversely affect humoral immunity.