Human activities have been identified as the causal factor in numerous documented extinctions. Which of the following specific causes has been identified in the majority of cases examined?
A) habitat reduction and modification
B) small population size
C) introduction of exotic species
D) overexploitation
A) habitat reduction and modification
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Consider the transplantation of tissue from a donor to a recipient who has a different HLA type but the same ABO blood type. Why will the recipient be likely to reject a kidney from the donor, but will not reject the blood from the donor?
A. There are no Class II MHC molecules on the red blood cells in the donor blood. B. There are no Class I MHC molecules on the kidney tissue from the donor. C. There are no Class I MHC molecules on the red blood cells in the donor blood. D. There are no ABO antigens on the kidney tissue.
A febrile and pneumonic illness first named in 1976 by scientists at the Centers for Disease Control and Prevention (CDC) who were investigating an epidemic of pneumonia among Penn-sylvania State American Legion members attending a convention in Philadelphia is known as:
a. Philadelphia pneumonia. b. legionnaires' disease. c. tuberculosis. d. rheumatic fever.
Which of the following eye disorders is not necessarily correlated with age?
1.cataracts 2.macular degeneration 3.trachoma 4.glaucoma 5.the need for bifocal lenses
The presence of the immune complexes leads to the activity of the neutrophils. What factor links these two?
A. complement B. cytokines C. mast cells D. helper T cells