Nematodes and rotifers have a body cavity that is
(a) called a coelom.
(b) called a pseudocoelom.
(c) completely lined by tissues derived from mesoderm.
(d) both a and c.
(b) called a pseudocoelom.
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A spike in which hormone triggers ovulation?
a. estrogen b. progesterone c. luteinizing hormone d. follicle stimulating hormone
The variable(s) in the 2005 peacock butterfly experiment is(are) the ____
a. butterfly wings pattern color b. butterfly species c. butterfly wings pattern color and sounds emitted d. rainforest region used e. percentage of survivors
Food poisoning from Salmonella occurs because of ________
A) an exotoxin secreted by Salmonella bacteria B) an endotoxin produced by Salmonella bacteria C) easy transmission between people living in close contact D) extremophile conditions
A virulence factor common to many members of the Enterobacteriaceae which permits them to deliver harmful proteins directly to cells is
A) fimbriae. B) a glycocalyx. C) type III secretion system. D) pili. E) porins.