The causative agent of cholera in humans is a member of the genus ________.
A. Vibrio
B. Escherichia
C. Shigella
D. Enterobacter
Answer: A
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Which animals have a gut with two openings, a mouth, and an anus?
a. cnidarians b. annelids c. flatworms d. sponges e. tapeworms
Most of the water and sodium is reabsorbed in the ____ of each nephron
a. glomerulus b. proximal tubule c. distal tubule d. loop of Henle e. collecting duct
Which of the following characterizes blood flow through capillaries?
A) small total cross-sectional area, so blood flows rapidly B) enormous total cross-sectional area, but wide so that blood cells pass quickly C) enormous total cross-sectional area, but narrow so that blood cells pass slowly D) small total cross-sectional area, so blood flows slowly
Which of the following is the best definition of generation time?
A) the length of time needed for lag phase B) the length of time needed for a cell to divide C) the minimum rate of doubling D) the duration of log phase E) the time needed for nuclear division