Which of the following virulence factors is specifically involved in helping an organism to physically spread throughout the body?

A) hyaluronidase
B) endotoxins
C) hemolysin
D) siderophores


Ans: A) hyaluronidase

Biology & Microbiology

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Imagine that sexual reproduction could occur between hyphae that were the same mating type. How might this affect the population of one species of fungus?

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On the Hawaiian Islands, speciation in Drosophila occurred when a small group of males and females colonized a new

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a. a founder effect only b. genetic drift only c. adaptive radiation only d. a founder effect and genetic drift, but not adaptive radiation e. a founder effect, genetic drift, and adaptive radiation

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Ionizing radiation

a. breaks apart chromosomes. b. alters genes. c. extends the length of the DNA molecules. d. links DNA molecules together. e. both breaks apart chromosomes and alters genes.

Biology & Microbiology

The white blood cells primarily responsible for adaptive immunity are

A. NK lymphocytes and neutrophils. B. B lymphocytes and T lymphocytes. C. macrophages and eosinophils. D. macrophages and neutrophils. E. neutrophils and dendritic cells.

Biology & Microbiology