Postsynaptic potentials are graded potentials, in which the membrane potential increases or decreases to a greater or lesser degree
1.True
2.False
1
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In males, testosterone (select all correct choices):
A. directs the development of male reproductive structures during embryogenesis. B. directs development of male secondary sexual characters during puberty. C. helps maintain adult health. D. acts on Sertoli cells. E. acts on Leydig cells.
A gene encoding a subunit of hemoglobin in humans is found to be homologous to a gene in chimpanzees. The
homologous gene in chimpanzees likely _____.
a. is a pseudogene b. encodes the same hemoglobin subunit c. is inactive because it is in a different species d. is a regulatory sequence e. encodes a respiratory enzyme
The most complete listing of the organisms the H5N1 strain of influenza virus can infect is ____
a. humans b. pigs c. birds d. humans and pigs e. humans, pigs and birds
The effect of resource availability on
population size determines a. the carrying capacity of the environment. b. exponential growth. c. the doubling time of a population. d. the population's biotic potential. e. all of these