The second signal during cytotoxic T-lymphocyte activation involves stimulation of the cell by interleukin 2 released by helper T-lymphocytes.
Indicate whether this statement is true or false.
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Question 2) Most activated B-lymphocytes differentiate into
A. memory helper T-lymphocytes.
B. macrophages.
C. plasma cells.
D. antigen-presenting cells.
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Question 3) Cytotoxic T-lymphocytes destroy infected cells by releasing
A. antibodies.
B. bradykinin and histamine.
C. perforin and granzymes.
D. CD4+.
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Question 4) Helper T-lymphocyte activation involves MHC class I, whereas cytotoxic T-lymphocyte activation involves MHC class II.
Indicate whether this statement is true or false.
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Question 5) Upon activation, a T-lymphocyte
A. ceases dividing and becomes a plasma cell.
B. ceases dividing and becomes a memory cytotoxic helper cell.
C. proliferates to form clones and memory cells.
D. proliferates to form B cells and plasma cells.
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Question 6) The first signal during helper T-lymphocyte activation involves
A. BCR of the helper T-cell binding with free antigen and engulfing it.
B. CD8 of the helper T-cell binding with MHC class III of the antigen-presenting cell.
C. CD4 of the helper T-cell binding with MHC class I part of the antigen fragment.
D. CD4 of the helper T-cell binding with MHC class II of the antigen-presenting cell.
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Question 7) As T-lymphocytes leave the thymus, they are
A. naive and not yet competent.
B. naive and immunocompetent.
C. activated but not yet competent.
D. activated and immunocompetent.
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Question 8) Negative selection is the process by which cells learn self-tolerance.
Indicate whether this statement is true or false.
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Question 9) Lymphocytes that are able to bind and respond to antigen are said to be _______________.
Fill in the blank with correct word.
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Question 10) When they leave the red marrow, pre-T-lymphocytes have
A. only the CD4 protein.
B. only the CD8 protein.
C. both the CD4 and CD8 proteins.
D. neither the CD4 nor CD8 protein.
E. either the CD4 or CD8 protein.
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