Of the following species of mycobacteirum, which causes a chronic disease of the skin, mucous membranes, and nerve tissue and has not yet been cultivated in vitro?
A. Mycobacterium paratuberculosis
B. Mycobacteirum lepraemurium
C. Mycobacteirum phlei
D. Mycobcteirum leprae
Ans: D. Mycobcteirum leprae
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In a temperate zone lake, what should the temperature profile be immediately after the fall overturn?
A. coldest water at the top, 4° C water at the bottom B. warmest water at the top, 4° C water at the bottom C. 4° C water throughout D. 10° C water throughout E. 4° C water at the top, coldest water at the bottom
Tritiated hydrogen (3H) differs from hydrogen (1H) in that
A. 3H has 2 more protons than 1H. B. 3H has 2 more electrons than 1H. C. 3H has 2 more neutrons than 1H. D. 3H has the same number of neutrons as 1H. E. 3H has a different electron configuration than 1H.
Class I major histocompatibility complex molecules are found on ________ cells.
A. all anucleated B. all nucleated C. antigen-presenting D. None of the choices are correct.
Hormones are distributed throughout the body
by the ____ system. a. exocrine b. lymphatic c. nervous d. circulatory e. integumentary