T lymphocytes that have both CD4 and CD25 are (cytotoxic/helper/regulatory) T cells
What will be an ideal response?
regulatory
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An advantage of all molecular assays is:
a. the ability to test for C. trachomatis from the same specimen at the same time. b. the ability to use these tests for assessing the successfulness of treatment. c. their role as evidence in medicolegal cases. d. the ability to detect the capsular antigen in body fluids.
According to the clonal selection theory
A. antibodies are modified, at the time of antigen exposure, to specifically react with the antigen. B. self-reactive T cells are killed in the thymus. C. B cells producing autoantibodies are eliminated in the thymus. D. each B cell is already programmed to produce a specific antibody. E. self-reactive T cells are killed in the thymus AND B cells producing autoantibodies are eliminated in the thymus.
An advantage of homeothermy is
A) that it requires a low caloric intake. B) that it maximizes allocation of energy to growth. C) that it allows the organism to remain active in a wide range of external temperatures. D) that it allows the organism to tolerate wide fluctuations in body temperature.
Streptokinase is useful for which of the following?
A) producing antibiotics B) cheese production C) biosensors D) dissolving blood clots E) insecticide