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

Biology & Microbiology

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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

Biology & Microbiology

_______ are complex carbon ring structures that

often have an iron atom at their center. a. Hemes b. Globins c. Globulins d. Sugars e. Alkenes

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology