Which of the following features of a pathogen is not considered to be a virulence factor when establishing infection within host?
A. Attachment fimbriae
B. Slime layer
C. Pigment production
D. Protein spikes
Answer: C
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No convincing fossil evidence exists for ____
a. evolution b. extinction c. Earth’s age d. catastrophism e. uniformitarianism
This illustration shows
a. cytoplasmic division in an animal cell. b. a contractile ring mechanism. c. how chromosomes are dragged to the poles. d. cytoplasmic division in an animal cell and a contractile ring mechanism. e. cytoplasmic division in an animal cell and how chromosomes are dragged to the poles.
All of the following are true regarding smoking EXCEPT
a. smoking inhibits the T cells from working properly in the lungs. b. smoking is viewed by many today as being socially unacceptable. c. research shows that the nicotine patch is no more effective than a placebo. d. choosing a "quit date" can increase the chance of quitting successfully.
Active transport makes it possible for cells to:
a. take up nutrients from the environment against concentrations gradients. b. transport out secretory products and waste material against concentration gradients. c. maintain nonequilibrium intracellular concentrations of ions such as Na+, K+, Ca2+, and H+. d. establish an electrical potential across the membrane. e. All of the above are correct.