21) Which statement about the B cells’ abilities to produce : 1380945.
21) Which statement about the B cells’ abilities to produce antibodies is most accurate?
A) B cells wait to encounter an antigen and then copy it.
B) There are no B cells until an antigen is encountered.
C) There may be 100 million different B-cells, each producing a different antibody.
D) Most B cells are capable of producing any kind of antibody.
E) B cells don’t produce antibodies until they develop in the thymus.
22) Infected body cells can self-identify for destruction by the immune system by:
A) placing fragments of the infectious agent on their surfaces.
B) reshaping their membranes into a pattern that B cells recognize.
C) secreting hormones that stimulate macrophages.
D) releasing histamine.
E) becoming dendritic cells.
23) CD4 and CD8 T cells are likely to become active when they:
A) interact with B-cells.
B) travel through the spleen.
C) travel through lymph nodes.
D) are attracted by the inflammatory response.
E) dock with a dendritic cell with a matching antigen.
24) Why does producing a large “clone” of activated T cells also provide long-term immunity?
A) More cells are produced than necessary.
B) Some of the T cells can become B cells.
C) Some of the T cells become memory cells.
D) Leftover antibodies last a long time.
E) The cloned cells are stronger than the original cells.
25) What is the explanation for why B cells come in so many different types that can produce so many different antibodies?
A) The genome of B cells is much larger than other body cells.
B) B cells can recombine their genes with T cells.
C) B cells can recombine their genes with the pathogen.
D) B cells have gene fragments that can shuffle or recombine.
E) B cells can regulate shape to match the antigen.
26) Cells in the body that have been infected by a virus or bacteria are specifically killed by:
A) cytotoxic B cells.
B) mast cells.
C) dendritic cells.
D) regulatory T cells.
E) cytotoxic T cells.
27) Cells that help initiate the adaptive immune response by placing microbial antigens on their surfaces are generally referred to as:
A) helper T cells.
B) antigen-presenting cells.
C) B cells.
D) mast cells.
E) regulatory T cells.
28) Place the following in proper sequence regarding activation of the cell-mediated response: (1) dendritic cell migrates to lymph node, (2) T cells divide rapidly, (3) dendritic cell ingests pathogen, (4) CD4 and CD8 cells dock with dendritic cell, (5) dendritic cell presents antigen on its surface.
A) 1, 2, 3, 4, 5
B) 5, 3, 1, 2, 4
C) 3, 1, 5, 2, 4
D) 4, 3, 1, 5, 2
E) 3, 5, 1, 4, 2
29) Which of the following best describes the role of regulatory T cells?
A) Regulatory T cells are a kind of helper T cell that stimulates B cells.
B) Regulatory T cells are a kind of helper T cell that stimulates cytotoxic T cells.
C) Regulatory T cells help limit the immune system response.
D) Regulatory T cells stabilize and support memory cells.
E) Regulatory T cells stimulate natural killer cells to attack tumors.
30) A plasma cell is a cell that has differentiated from a:
A) B cell.
B) mast cell.
C) T cell.
D) dendritic cell.
21) Which statement about the B cells’ abilities to produce : 1380945