Which of the following would be a possible consequence of a disorder that selectively destroys the T regulatory cells in a patient?
A) impaired antibody production
B) autoimmune diseases
C) frequent infections with parasitic pathogens
D) increased incidence of certain cancers
E) frequent infections with viral and fungal pathogens
Ans: B) autoimmune diseases
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Would antibodies produced by a patient in response to infection be monoclonal, or polyclonal?
monoclonal. B. Since a single pathogen has multiple antigens, and each antigen has multiple epitopes, the responding antibodies to a whole pathogen would be polyclonal. C. Since the pathogen would most likely mutate slightly during the infection (producing different epitopes), the responding antibodies would be polyclonal. D. Since the pathogen would acquire and modify self-antigens during the infectious process, the antibodies produced during the response would be polyclonal.
Rolling circle replication of DNA is characterized by the absence of
A) the DNA polymerase. B) a nick in the DNA template. C) the RNA primers. D) the replication bubble. E) the Okazaki fragments.
In ____________, fats accumulate on the inner walls of the arteries, narrowing the diameters of arteries and also leading to elevated blood pressure.
A. a heart murmur B. Purkinje fibrosis C. erythrocytosis D. atherosclerosis
Features that are useful for identification of fungal species include ________.
A. ability to produce chlorophyll a B. presence of a membrane bound nucleus C. size, shape color, and number of spores D. All of the choices are correct.