The second most commonly reported sexually transmitted infection in the United States, according to the CDC, is:
a. M. catarrhalis.
b. N. gonorrhoeae.
c. N. meningitidis.
d. HIV.
B
According to the CDC, N. gonorrhoeae is the second most commonly reported sexually trans-mitted infection in the United States.
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Implantation of an embryo normally has occurred by how long after fertilization?
A. 3 days B. 6 days C. 12 days D. 20 days E. 1 month
The role of the Na/K pump in action potential is to:
a. allow movement of sodium into the cell. b. allow movement of potassium out of the cell. c. allow movement of potassium into and sodium out of the cell. d. allow movement of both ions into the cell. e. allow movement of both ions out of the cell.
Silicon is an element that is found directly underneath carbon in the periodic table and thus has similar properties to carbon, including electron orbitals. How many electrons are in the valence shell of a silicon atom?
A) 1 B) 2 C) 4 D) 6
What do Echinococcus granulosus, Entamoeba histolytica, and Enterobius vermicularis have in common?
A) They are transmitted by insect vectors. B) They live in the intestines of their definitive host. C) They are intracellular parasites. D) They cause zoonoses in humans. E) They are diagnosed by examination of a blood smear.