Simple diffusion may involve the movement of __________ through the plasma membrane down a
concentration gradient.
a. small polar molecules
b. small nonpolar molecules
c. large polar molecules
d. large nonpolar molecules
e. water
B
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Which of the following elements is considered an essential macronutrient for plants?
a. zinc b. uranium c. iron d. nickel e. carbon
Defective mitochondria are a cause of Luft’s syndrome
and a. Marfan’s syndrome. b. Friedrich’s ataxia. c. type I diabetes. d. Alzheimer’s disease. e. all of these.
The appearance of Mycobacterium leprae after they are stained with an acid-fast stain is
a) purple. b) red. c) colorless. d) brown.
A child has a sore throat, headache, high fever, and a cough. A couple of days later there are white spots with a red margin on the mucous membranes of the mouth. These signs and symptoms are consistent with infection with
A. rhinovirus. B. measles virus (rubeola). C. rubella virus. D. parainfluenza virus. E. mumps virus.