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

Biology & Microbiology

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What limits the frequency of action potentials?  

A.  chloride ions B.  spike amplitude C.  nodes of Ranvier D.  refractory period

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Which of the following is not a flatworm?

a. tape worm b. ringworm c. blood fluke d. planaria e. Bipalium

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In general, developed countries have lower population growth rates than less developed countries

Indicate whether the statement is true or false

Biology & Microbiology

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.

Biology & Microbiology