The lungs are protected from microorganisms by

A. lysozyme in mucus.
B. phagocytic action of alveolar macrophages.
C. the ciliated epithelial cells.
D. All of the choices are correct.


Answer: D

Biology & Microbiology

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The normal RB gene functions as

A) an activator of transcription. B) a proto-oncogene. C) an activator of translation. D) a cell surface receptor. E) an inhibitor of transcription.

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Barr bodies

A. are formed in females. B. are formed only in males. C. cause an increased production of X-linked gene products. D. inactivate Xic on autosomes. E. are formed only in males and inactivate Xic on autosomes.

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The top three causes of death in the United States are due to infectious diseases.

a. true b. false

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In general, the term ________________ is used to describe disease causing agents.

Fill in the blank(s) with the appropriate word(s).

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