Osteoporosis sometimes results from ____
a. excessive PTH secretion
b. insufficient PTH secretion
c. excessive intake of vitamin D
d. excessive intake of iodine
e. insufficient intake of vitamin D
ANSWER: a
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The diffusion bioassay
A. determines the concentration of antimicrobial necessary to kill a bacteria. B. determines the concentration of antimicrobial necessary to inhibit growth of a bacteria. C. is similar in principle to the Kirby-Bauer test. D. determines the concentration of antimicrobial in a fluid. E. is similar in principle to the Kirby-Bauer AND determines the concentration of antimicrobial in a fluid.
Many closely related duck species exhibit ____, the dramatic variation in the appearance of males but not females,
which is an almost certain sign of ____.
a. asexual reproduction; sexual selection b. asexual reproduction; artificial selection c. sexual dimorphism; sexual selection d. sexual dimorphism; artificial selection e. sexual uniformitarianism; sexual selection
Which of the following are inborn errors of metabolism?
a. PKU and alkaptonuria b. sickle cell anemia and hemophilia c. cystic fibrosis and Tay-Sachs disease d. Huntington's disease and fragile X syndrome e. cri-du-chat syndrome and Down syndrome
Spatial summation is characterized by:
a. several presynaptic neurons releasing neurotransmitter simultaneously. b. several presynaptic neurons releasing neurotransmitter in a sequential pattern. c. several postsynaptic neurons receive sequential inputs from several presynaptic neurons. d. a single presynaptic neuron firing multiple times in rapid succession. e. a single presynaptic neuron directly contacting several postsynaptic neurons.