Fossil evidence indicates that ____ were common among ancient land plants
a. fungal infections
b. endomycorrhizae
c. lichens
d. haustoria
e. ectomycorrhizae
B
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Ovulation is the follicular response to a burst of secretion of _____
A) luteinizing hormone (LH) B) progesterone C) inhibin D) prolactin E) estradiol
Mucosal antibacterial properties, a valvelike mechanism, host immune responses, and defensins are all host defense mechanisms found in the ______ tract
a. digestive b. upper respiratory c. urinary d. genital
Hydrophobic hormones act by ____
a. triggering a genomic response b. triggering a signal transduction pathway c. activating an effector molecule d. inhibiting feedback loops e. preventing translation
The endomembrane system did not start developing
until the atmosphere was a. high oxygen, high carbon dioxide. b. high hydrogen, low oxygen. c. changing from low oxygen to high oxygen. d. firmly in the age of aerobes. e. all of these.