The carrying capacity of an environment is determined by:
a. the net rate of reproduction of the female members
b. natural disasters
c. the predation rate on the females
d. diseases suffered by both sexes
e. the sustainable supply of resources it provides
e
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Which of the following is NOT a part of the MAP kinase pathway? (Select all correct choices.)
A. A receptor kinase is activated by binding to a growth factor and phosphorylates receptor cytoplasmic domains. B. The activated receptor kinase dimer activates the RAS protein to bind to a GTP. C. The activated RAS protein activates protein kinases in the signal-transduction pathway. D. A series of protein kinases amplify the signal to the nucleus where genes responsible for cell division are switched on. E. A pyrophosphatase enzyme terminates the cellular response.
Export of flagellin subunits is mediated by
A. the type I secretion pathway. B. an apparatus in the basal body of the flagellum that is related to the type II secretion pathway. C. an apparatus in the basal body of the flagellum that is related to the type III secretion pathway. D. None of the choices are correct.
If the objective lenses of a microscope can be changed without losing focus on the specimen, they are said to be
A. optifocal. B. parfocal. C. equifocal. D. totifocal.
Who, among the following, was the earliest
naturalist?
a. Darwin b. Plato c. Mendel d. Galileo e. Aristotle