The HIV-1 pol protein encodes
A. a protease.
B. an integrase.
C. a reverse transcriptase.
D. Both A and B.
E. All of the above.
E
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The workers that study the occurrence and frequency of disease in large populations and determine the source and cause of infectious disease epidemics are:
A) optometrists. B) neurologists. C) dieticians. D) epidemiologists
Natural killer lymphocytes may be distinguished from other lymphocytes because they
A) lack the CD3 cell surface marker. B) possess the CD56 and CD16 cell surface markers. C) lack immunoglobulin and specific antigen receptors. D) are more likely to appear as larger lymphocytes with a few azurphilic granules. E) All of the above.
Which condition is an autoimmune disorder characterized by a severe reaction to foods containing gluten?
A) celiac disease B) Crohn's disease C) enteritis D) ulcerative colitis
Which of the following is NOT a result of smoking?
A) stained fingers B) increased sexuality C) risk of bone fractures D) bad breath