Define rugae
What will be an ideal response?
the deep folds in the mucosa of the stomach that allow for expansion
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Proton gradients are generated by all of the following complexes except
A) complex I. B) complex II. C) complex III. D) complex IV. E) coenzyme Q.
The quick response of the immune system to a second infection is due to the _____, a feature of the immune system as demonstrated by the success of vaccines
a. activation of macrophage cells b. suppression of suppressor cells c. T and B memory cells d. high levels of antigen e. new cytotoxic T cell.
All are true of oyster reefs except
a. they are oriented perpendicular to currents. b. they are concentrated in lower salinity areas. c. they are important habitats for other organisms. d. they are adversely affected by rapid changes in salinity. e. they are increasing in the Chesapeake Bay.
Which statement below characterizes metabolic pathways?
a. They are a random sequences of reactions. b. They are always biosynthetic. c. They are always degradative. d. They are enzyme-mediated sequences of reactions. e. They are always linear reactions.