Eating sashimi (uncooked fish) is a risk factor for infection with
A) Entamoeba histolytica.
B) Taenia saginata.
C) Giardia intestinalis.
D) Enterobius vermicularis.
E) Anisakis simplex.
E
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Which layer(s) of the digestive tract in mammals directly contacts the lumen?
a. mucosa b. muscularis c. submucosa d. serosa e. serosa and muscularis
The type of plant cell that provides rigid support and is dead at maturity is a cell.
A. sieve tube B. guard C. parenchyma D. sclerenchyma E. collenchyma
The nitrogenous base found in RNA but not in DNA is
a. adenine. b. cytosine. c. guanine. d. uracil. e. thymine.
Which of the following statements is correct?
(A) At 10 mm Hg partial pressure, hemoglobin binds oxygen but myoglobin does not. (B) At 20 mm Hg partial pressure, myoglobin and hemoglobin bind oxygen in equal amounts. (C) At 40 mm Hg partial pressure, myoglobin has a greater affinity for oxygen than hemoglobin has. (D) At 80 mm Hg partial pressure, myoglobin binds twice as much oxygen as hemoglobin binds.