What factors may have played a role in the patient's development of pneumonia after surgery?
A. His immune system was depleted by excessive IV fluids.
B. His caregiver at the hospital did not use proper handwashing technique.
C. His visitors wore gowns and masks when entering his room.
D. His caregiver maintained his bed in an upright position after his surgery.
B. His caregiver at the hospital did not use proper handwashing technique.
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0.2 mls of a 10-4 dilution of a virus preparation yields 90 plaques. What is the number of PFU per ml in the undiluted virus preparation?
A. 9.0 × 108 B. 4.5 × 106 C. 4.5 × 107 D. 9.0 × 105
Growth factors are examples of which type of chemical signal?
A. paracrine signals B. autocrine signals C. hormones D. pheromones E. neurotransmitters
Most of earth's fresh water is _____
a. in lakes and streams c. frozen as ice b. in aquifers and soil d. in bodies of organisms.
Queen Victoria had an allele for alkaptonuria that originated by mutation in one of her parents. Indicate whether the statement is true or false