The main route of transmission of the poliovirus is ________.
A. body contact
B. respiratory secretions
C. food and water
D. fomites
Answer: C
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True or false: Supercoils in DNA are induced or relaxed by enzymes called topoisomerases
A. true B. false
The endomembrane system did not start developing
until the atmosphere was a. high oxygen, high carbon dioxide. b. high hydrogen, low oxygen. c. changing from low oxygen to high oxygen. d. firmly in the age of aerobes. e. all of these.
The word evolution, as used in biology, literally means
a. natural selection. b. genetic drift. c. divergence. d. genetic change. e. mutation.
Of the following goals listed, which are the two goals of epidemiology?
I. isolate the infectious pathogen for study and vaccine creation II. describe the nature, cause, and extent of new or existing diseases in populations III. identify patient zero and how the initial infection occurred IV. intervene to protect and improve health in populations V. distribute vaccines so that future outbreaks do not occur A) I and II B) III and IV C) III and V D) I and III E) II and IV