Any organism or agent that produces a disease is known as a
A) Pathogen
B) Commensal
C) Reservoir
D) Vector
Ans: A) Pathogen
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In an experiment to track the movement of growth factor molecules from secretion to the point of receptor binding in a particular species of mammal, a student found a 20-fold reduction in mm traveled when in the presence of an adrenal hormone. This is in part attributable to which of the following?
A) The growth factor is a paracrine signal. B) The growth factor depends on osmosis. C) The mammal only carries growth factor through the lymph. D) The growth factor is an exocrine signal. E) The growth factor is an endocrine signal.
A sick child may have influenza or RSV. These virus infections have different treatment options, so the physician requests antibody titer tests. The results are as follows: anti-influenza antibodies are primarily IgM, and anti-RSV antibodies are all IgA
and IgG. Which of the following is the most appropriate interpretation? A) the child has a current RSV infection and was previously exposed to influenza. B) the child currently has influenza and has previously been exposed to RSV. C) the child has concurrent influenza and RSV infections. D) the child has neither influenza nor RSV. E) the results do not provide sufficient data to draw a conclusion.
During exponential growth, a population always _____
A) grows by thousands of individuals B) grows at its maximum per capita rate C) quickly reaches its carrying capacity D) cycles through time E) loses some individuals to emigration
An animal has a very thin layer of insulation between its body core and surface causing it to have a very high ________
A) body temperature B) salt content C) level of fat D) thermal conductivity