Mastering Biology 6-( Elena UTK 2016)

25 July 2022
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question
Which statement accurately summarizes a feature of passive transport
answer
It is a spontaneous process
question
In cells, membrane proteins are responsible for the passage of substances that can't cross the membrane on their own. Channel and carrier proteins are involved in facilitated diffusion. Pumps are involved in active transport. In terms of their properties or functions, which statement most accurately describes how these three types of membrane proteins compare
answer
Among the three types, only pumps can concentrate substances on one side of the membrane
question
For the study shown in the figure, what is the most appropriate control to show that the observed pits and mounds are not simply irregularities in the lipid bilayer caused by the freeze-fracture process
answer
Instead of a cell, use an artificial membrane composed only of pure phospholipids
question
When biological membranes are frozen and then fractured, they tend to break along the middle of the bilayer. The best explanation for this is that
answer
the hydrophobic interactions that hold the membrane together are weakest at this point
question
One of the roles of plasma membrane proteins is to
answer
allow passage of select molecules that could not otherwise cross the lipid bilayer