The most important virulence factor of Vibrio cholerae is
A. the presence of two axial flagella.
B. the fact that it is oxidase positive.
C. its ability to survive in fresh water.
D. its ability to produce a potent exotoxin.
E. its ability to live in estuarine and marine environments all over the world.
Answer: D
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What are the units of r?
A. individuals B. individuals per unit time C. change in individuals per unit time/individuals at starting time
The structure that makes loose connective tissue flexible is
a. collagen. b. adipose tissue. c. jellylike ground substance. d. calcium salts. e. elastic fibers.
In club fungi, each club-shaped cell initially ____.
A. is a spore B. is a zygote C. contains a single nucleus D. is dikaryotic E. undergoes mitosis to produce spores
Receptors on the surface of pathogens that are made of glycoproteins and lipoproteins are called
a. capsules. b. slime layers. c. adhesins. d. adhesives.