The outer part of a G protein receptor binds __________, and its inner part binds __________
a. the signaling molecule; tyrosine kinase
b. the signaling molecule; a G protein
c. G protein; tyrosine kinase
d. G protein; an ion channel
e. an ion channel; a G protein
B
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Human female germ cells form
a. before birth. b. shortly after birth. c. at puberty. d. during late teenage-hood. e. at fertilization
Meiosis in female humans is completed
a. before birth. b. shortly after birth. c. during the ovarian cycle. d. at fertilization. e. when a woman is fully mature
Even though the phylogenetic lineages for hominins are not definitive, four of the following statements describe possibilities. Which is NOT a possibility?
A. Homohabilis is the likely ancestor of our species. B. Homo sapiens is the most recent. C. Australopithecus is probably more ancient than Homo. D. Homo erectus preceded Homo sapiens. E. Chimpanzees and bonobos are the closest living relatives to modern humans.
If the tight junctions in the intestine were disrupted
A. small molecules would not be exchanged between neighboring intestinal cells. B. bacteria could move from the intestines to the bloodstream causing an infection. C. intestinal cells could not attach to integral membrane proteins. D. small molecules would not be able to move into cells lining the intestine. E. intestinal cells could not attach to the extracellular matrix.