The site at which a virus has infected and subsequently lysed the infected cell, releasing its progeny to infect and lyse surrounding cells, thereby forming a "clear zone," is
A. a burst area.
B. a lyse area.
C. a plaque.
D. a dead zone.
C
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Allelopathy is
A. an obligate mutualism between a plant and its pollinator. B. an example of asymmetric competition between plant species. C. the transmission of viruses from ticks to their primary hosts. D. the movement of genes from one species to another.
Four of the five choices listed below can be used in
describing aspects of fungal reproduction. Select the exception. a. spores b. pollen c. dikaryotic d. gametangia e. asci
Which embryonic tissue is defective if an embryo
develops into a creature that appears normal in almost every aspect except for the lining of the digestive tract? a. ectoderm b. endoderm c. gastroderm d. mesoderm e. none of these
Which of the three major lines of defense functions to prevent pathogens from entering the body?
A) phagocytic white blood cells B) skin and mucous membranes C) acquired defenses