Which of the following is responsible for initiating clonal ...

[geoffrey]

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

[jsm54321]

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]

Correct answers!

[jsm54321]

Great! Please up vote