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
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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.
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.
The top three causes of death in the United States are due to infectious diseases.
a. true b. false
In general, the term ________________ is used to describe disease causing agents.
Fill in the blank(s) with the appropriate word(s).