Which of the following vessels does NOT carry deoxygenated (lacking oxygen) blood?
a. inferior vena cava
b. pulmonary artery
c. pulmonary vein
d. superior vena cava
e. capillaries
C
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A 29-year-old patient with acquired immunodeficiency syndrome (AIDS) is suspected of having a C. neoformans infection in the cerebrospinal fluid (CSF). A CSF specimen is collected and set up on cycloheximide agar. In addition, an India ink stain is set up. The India ink stain reveals encapsulated yeast; however, 3 weeks later, the cycloheximide agar is negative. Which one of the following
statements explains this discrepancy? a. The India ink result is most likely false positive. b. The ingredients in the cycloheximide agar most likely inhibited the growth of the organism. c. C. neoformans is rarely recovered from CSF; therefore the cycloheximide result is accurate. d. The India ink stain is most likely conta-minated.
Who is considered to be the father of modern antibiotics?
A. Domagk B. Watson C. Chargaff D. Crick E. Fleming
In humans, the oxygen concentration of the blood is the most important chemical stimulus for regulating the rate of
respiration. Indicate whether the statement is true or false.
A cross between a male horse and a female donkey produces a mule. Mules are an example of
A. hybrid infertility. B. gametic isolation. C. zygote mortality. D. temporal isolation.