What is incorrect about pertussis?
A. a virulence factor of B. pertussis is toxins that destroy cilia cells
B. the source of infection is direct contact with inhaled droplets
C. the paroxysmal stage is characterized by persistent coughing
D. the number of cases is steadily decreasing since 1976
E. it can cause severe, life-threatening complications in babies
Answer: D. the number of cases is steadily decreasing since 1976
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Which organisms would MOST likely be isolated from aerobic growth conditions with acetate and a soil sample heated to 80 °C for 10 min?
A) aerobic or facultative anaerobic acetogens B) endospore-forming bacteria C) hyperthermophilic heterotrophic bacteria D) mycoplasmas
Over time, cancerous cells typically lose the cell adhesion molecules embedded in their plasma
membrane. Loss of these molecules is best associated with which of the following traits of cancer cells?
a. increased rate of cell division b. production of new proteins c. angiogenesis d. migration to new locations in the body e. loss of chromosomes
The most extreme form of female genital cutting (FGC) involves the removal of the clitoris, all of the inner lips, and part of the outer lips. The remaining parts of the outer lips are then stitched together. This form of FGC is called _____.
A. ovariotomy B. excision C. infibulation D. clitoridectomy
The enzymes needed for the breakdown of all categories of ingested food are produced by which organ.
A) liver B) large intestine C) stomach D) pancreas