Each of the following is a main cause of cancer except
A) carcinogens.
B) radiation.
C) infectious agents.
D) heredity.
E) All are causes of cancer.
Answer: E
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Specific proteins produced by cells of the immune system in response to the presence of foreign molecules that circulate in the serum and are present in secretions such as saliva are called:
a. antigens. b. immunoglobulins. c. cytokines. d. phagogens.
Precipitation occurs when
A. antigen combines with antigen. B. antibody combines with antibody. C. antibody combines with antigen. D. antibody combines with antigen at optimal proportions.
The development of a blood substitute would be welcomed for all of the following reasons EXCEPT which one?
A) Human blood may carry and transmit infectious agents. B) Human blood storage requires refrigeration, which might not be available in developing countries. C) The supply of donated human blood generally cannot keep up with the demand. D) Transfused blood rarely persists for more than a few days in the recipient. E) Typing and cross-matching are necessary with human blood, and the right type may not be available.
What is the best term for an RNA molecule that possesses catalytic activity?
A. ribozyme B. ribosomal RNA C. RNase D. enzyme