Syphilis can be transmitted
A) by sexual contact.
B) from mother to fetus.
C) by fomites.
D) both by sexual contact and from mother to fetus.
E) by sexual contact, by fomites, and from mother to fetus.
D
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A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive
isotope potassium-40, which has a half-life of 1.3 billion years. The rock now contains 3 mg of the isotope. About how old is the rock?
a. 2.6 billion years b. 5.2 billion years c. 1.3 billion years d. 0.3 billion years e. 0.4 billion years
In which of the following ways has climate change impacted weather patterns in the United States?
A. Average temperatures have increased up to 1.8°F; however, these changes have been very regional, with some areas seeing increasing temperatures and others seeing decreasing temperatures. B. Average precipitation has increased by 4%; however, this has been a very regional change, with some areas seeing significant increases in rainfall and other areas seeing significant decreases in rainfall. C. Severe weather events, including droughts and flooding, have decreased in frequency. D. Geological events, including volcanoes and earthquakes have increased in frequency.
Which of the following results in characteristic of mycoplasma spp. colony culture?
A. Alpha-hemolysis on blood agar B. Beta-Hemolysis on blood agar C. Double zone of hydrolysis on egg-yolk lecithin D. Fried egg colonies on agar E. Growth on chocolate agar
All of the following animals use echolocation to locate objects except
A. whales. B. cats. C. shrews. D. bats. E. dolphins.