Which statement about a secondary immune response is FALSE?
a. It is a response to an antigen.
b. It may occur years after a primary response.
c. It involves memory cells.
d. It has a longer latent period than a primary response.
e. It is stimulated by less antigen than in a primary response.
d
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Ram ventilation is used by _____ during respiration.
A. salamanders B. frogs C. penguins D. whales E. tuna
Four of the five answers below are limits to achieving a population's full biotic potential. Select the
exception. a. lack of nutrients b. predation c. exponential growth d. competition for space e. waste buildup
Sudan IV, a dye that binds to nonpolar molecules, is used to detect the presence of macromolecules in food. Sudan IV would test positive in the presence of what macromolecule?
A. starch B. chitin C. DNA D. fats E. hemoglobin
Acyclovir is an antiviral chemical that resembles a nucleotide but lacks a 3' OH group and cannot form phosphodiester bonds. Why is Acyclovir useful in treating some viral infections?
A. Acyclovir stops viral protein synthesis. B. Acyclovir halts viral DNA replication. C. Acyclovir blocks the assembly of viral cell capsules. D. Acyclovir hydrolyzes viral polysaccharides.