Which statement about transmembrane proteins is true? a. they usually have one or more α helices spanning the membrane bilayer. b. they are always inserted with the amino terminus on the lumenal side and the carboxyl terminus in the cytosol. c. they cross the membrane only once. d. the signal sequences are always cleaved off.
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Which statement about transmembrane proteins is true? a. they usually have one or more α helices sp...
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