HIV infection and the subsequent destruction of which cell type is most devastating to overall immune system function?
A. cytotoxic T cells
B. memory B cells
C. helper T cells
D. monocytes
E. natural killer cells
C. helper T cells
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Which of the following stain as either Gram-positive or Gram-negative?
a. Archaea b. Bacteria c. Archaea and Bacteria d. neither Archaea nor Bacteria e. Methanogens
_______ are complex carbon ring structures that
often have an iron atom at their center. a. Hemes b. Globins c. Globulins d. Sugars e. Alkenes
Urinalysis shows that Marianne has large amounts of protein in her urine. The area of the nephron that must be malfunctioning is the ________
A) loop of the nephron B) distal convoluted tubule C) glomerulus D) collecting duct
Criteria for assigning pathogens to a biosafety level include all the following except
A) ability to culture the pathogen using standard laboratory media and equipment. B) availability of disease prevention and/or treatment. C) level of infectivity. D) extent of disease and mortality rates. E) mode of transmission.