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Author Question: Which of the following is responsible for initiating clonal selection? a. T cells b. B cells c. ... (Read 136 times)

geoffrey

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on: Jun 25, 2018
Which of the following is responsible for initiating clonal selection?
 
  a. T cells
  b. B cells
  c. Antigens
  d. Lymphocytes

Question 2

An experiment is designed to determine specific cell types involved in cell-mediated immune re-sponse. The experimenter is interested in finding cells that attack cells that have specific antigens. Which cells should be isolated?
 
  a. Lymphokine-producing cells
  b. T-cytotoxic cells
  c. Helper T cells
  d. Macrophages


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jsm54321

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Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: C
The lymphocytes remain dormant until an antigen initiates clonal selection. T cells do not initiate clonal selection. B cells are antibodies. Lymphocytes are released into the circulation as immature cells that react with antigens.

Answer to Question 2

ANS: B
Cell-mediated immunity is driven by T-cytotoxic (Tc) cells that attack antigens directly and de-stroy cells that bear foreign antigens. Lymphokine-producing cells, helper T cells, and macro-phages do not attack antigens directly and destroy cells that bear foreign antigens.


geoffrey

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Reply #2 on: Jun 25, 2018
Correct answers!


jsm54321

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Reply #3 on: Jun 25, 2018
Great! Please up vote :D


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