Each heart muscle cell is coupled to its neighbors electrically by
A. gap junctions.
B. pores.
C. axons.
D. striations.
E. tight junctions.
Answer: A
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Which type of lifestyle is demonstrated by bacteria in biofilms?
A. Sessile B. Photoautotrophic C. Planktonic D. Parasitic
For the following list of anti-HIV drugs and their mechanism of action, identify the mismatch.
A. AZT (azidothymidine); as an analog of thymidine, it is incorporated into viral RNA in place of thymidine B. Protease inhibitor; blocks the active site of the protease required for assembling new viral particles. C. Reverse transcriptase inhibitor; blocks the active site of the enzyme required to convert viral RNA to DNA D. Integrase inhibitor; blocks the active site of the enzyme required to splice HIV DNA into the human genome
Which sequence of steps is the correct order for cellular division?
A. anaphase, metaphase, prophase, telophase, cytokinesis B. prophase, metaphase, anaphase, telophase, cytokinesis C. prophase, metaphase, anaphase, cytokinesis, telophase D. cytokinesis, metaphase, anaphase, telophase, prophase
Infection with influenzavirus is commonly diagnosed using
A) an immunoblot assay. B) viral neutralization tests. C) immunochromatographic assay. D) viral hemagglutination inhibition test. E) both immunochromatographic assay and viral hemagglutination inhibition test.