The reason that some individual hormones have so many different effects is that
a. they influence gene transcription.
b. they trigger a second messenger system that produces a cascade of effects.
c. there are a great many different cells in different tissues that have specific receptors for the
hormone.
d. the hormone is carried throughout the body and only a small amount is needed to produce
its effect.
e. they are realeased in different concentrations.
C
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Addition of a benzopyrene adduct is the result of what type of reaction?
A. alkylation B. hydrolysis C. depurination D. oxidation E. radiation
A type III survivorship curve is characteristic
of
a. dogs. b. goats. c. hawks. d. clams. e. horses
The alternate forms of a gene are called
A) chromosomes. B) loci. C) alleles. D) genomes.
The number of animal phyla now recognized is about
A. 17. B. 67. C. 10. D. 35. E. 56.