The virulence of the tubercle bacillus is due to its
A. toxin.
B. lysogenic conversion.
C. resistance to antibiotics.
D. survival within macrophages.
E. lysogenic conversion AND resistance to antibiotics.
Answer: D. survival within macrophages.
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As the density of a population increases, the
A) survival rate increases. B) reproductive rate increases. C) intensity of intraspecific competition decreases. D) individual growth rate decreases.
Phospholipids are large organic molecules with a ________, polar phosphate head connected to ________, nonpolar fatty acid tails. How do these molecules arrange themselves to form a mostly impermeable barrier between a liposome and its environment?
a. hydrophilic; hydrophobic; They line up hydrophilic head to hydrophilic head with the tails all facing outward from the center line of the membrane. b. hydrophilic; hydrophobic; They line up hydrophobic tails facing each other at the center line of the membrane with the hydrophilic heads facing outward, away from the center line of the membrane. c. hydrophobic; hydrophilic; They line up hydrophobic tails facing each other with the hydrophilic heads facing outward, away from the center line of the membrane. d. hydrophobic; hydrophilic; They line up hydrophilic head to hydrophilic head with the tails all facing outward from the center line of the membrane.
Which of the following is the most common place to find DNA methylation?
A) on cytosines when adjacent to guanines B) on cytosines when adjacent to other cytosines C) on guanines when adjacent to cytosines D) on cytosines when they are base paired to guanines E) on guanines when adjacent to other guanines
A gastroenteritis which usually resolves in 72 hours is contracted from eating shellfish contaminated with
A. Campylobacter jejuni. B. Ehrlichia caffeensis. C. Helicobacter pylori. D. Vibrio cholera. E. Vibrio parahaemolyticus.