An example of descriptive epidemiology is __________.
A) a study comparing disease rates in vaccinated and unvaccinated individuals
B) Florence Nightingale's studies of disease transmission in soldiers and civilians during the Crimean War
C) John Snow's study of the London cholera outbreak in 1848-1849
D) the first report of a disease occurrence
E) comparison of drug effectiveness in two groups of patients
Ans: C) John Snow's study of the London cholera outbreak in 1848-1849
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When a neuron responds to a particular neurotransmitter by opening gated ion channels, the neurotransmitter is serving as which part of the signal pathway?
A) relay molecule B) transducer C) signal molecule D) response molecule
Which of the following groups had made their appearance during the Ordovician period?
A. jawed fish and amphibians B. jawless and jawed fish C. amphibians and reptiles D. reptiles and mammals E. All of these groups had appeared by the Ordovician period.
Which of the following subatomic particles has appreciable mass, but no charge?
a. proton b. both proton and neutron c. Electron d. neutron
Which statement about parasitism is true?
a) The host is generally smaller than the parasite. b) There are examples of parasites in every kingdom of life. c) Parasites are always severe and kill the host. d) All parasites will remain attached to their host for the entire life span of the host. e) All parasites require a single host for their life cycle.