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
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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?
A. The frequency of sexual reproduction would be higher. B. The frequency of sexual reproduction would be lower. C. The frequency of sexual reproduction would remain the same.
On the Hawaiian Islands, speciation in Drosophila occurred when a small group of males and females colonized a new
island, where they faced environmental selection pressures. In addition, sexual dimorphism – and therefore, sexual selection – maintained reproductive isolation from other populations on the new island. These populations, although closely related, remained ecologically different. These events are examples of ____.
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
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.
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.