________ immunity is an epidemiological concept that explains the resistance of a population to infection and the spread of an infectious organism due to the immunity of a high percentage of the population.
A. Innate
B. Experimental
C. Herd
D. Natural
Answer: C
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Microbes playing a role in nitrogen fixation in plants live in ________, while those playing a role in the digestive tract of certain herbivores live in ________
A) rumens / nodules B) nodules / rumens C) nodules / fortrans D) fortrans / rumens
The Protenor mode of sex determination is the ________
A) XO/YY scheme B) XX/XO scheme C) hermaphroditic scheme D) scheme based on F plasmids inserted into the FMR-1 gene E) scheme based on single translocations in the X chromosome
A balloon permeable to water but not to glucose contains a 10% glucose solution. A beaker contains a 5% glucose solution. Which of the following is TRUE?
A) The solution in the beaker is hypertonic relative to the solution in the balloon. B) The solution in the balloon is isotonic; the solution in the beaker is hypertonic. C) The solution in the balloon is hypotonic relative to the solution in the beaker. D) The solution in the balloon is hypertonic relative to the solution in the beaker.
Signaling proteins that alert the immune system an infection is present and that sometimes directly fight pathogens are the:
A) histamines. B) complement proteins. C) antibodies. D) cytokines. E) antihistamines.