The cytoplasmic membrane is composed of a ________ bilayer with embedded ________
a. phosphate / polysaccharides
b. polysaccharide / proteins
c. protein / phospholipids
d. phospholipid / proteins
Answer: D
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Salinity is expressed in parts per
a. hundred. b. thousand. c. ten thousand. d. hundred thousand. e. million.
Frequency-dependent selection acts to decrease the frequency of which phenotype in a population?
a. The least common phenotype
b. The most common phenotype c. The most conspicuous phenotype d. The most camouflaged phenotype e. The phenotype at an extreme of the normal distribution
A trend toward the decrease in the size of plants on the slopes of mountains as altitudes increase is an example of
A) a cline. B) a bottleneck. C) relative fitness. D) genetic drift. E) geographic variation.
Which of the following statements if NOT true?
a. Exotoxins are more lethal than endotoxins b. Endotoxins are part of the gram-positive cell wall c. Exotoxins can be neutralized in the blood by antitoxin treatment d. Endotoxins can cause septic shock