Which of the following has been associated with a form of liver cancer?
A. Hepatitis A virus
B. Hepatitis B virus
C. Human T-cell lymphotropic virus
D. Human papilloma virus
Answer: B
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What limits the frequency of action potentials?
A. chloride ions B. spike amplitude C. nodes of Ranvier D. refractory period
Which of the following is not a flatworm?
a. tape worm b. ringworm c. blood fluke d. planaria e. Bipalium
In general, developed countries have lower population growth rates than less developed countries
Indicate whether the statement is true or false
Microbes known as transient microbiota are
A. microorganisms that remain with the person throughout life. B. microorganisms that may cause a disease under certain circumstances. C. organisms that remain in the body for a short time. D. unsuccessful microbial invaders because of the presence of preexisting microbes. E. sources of microbial contamination.