Other cell membrane molecules include a compound called __________ , which functions to provide fluidity to rigid membranes and rigidity to fluid membranes; and surface carbohydrates, which function in the membrane not to provide energy, but instead to provide __________ .  Aminophospholipids move to the inner leaflet of the membrane, by an enzyme known as the __________  . A main function of the cell membrane is to be very selective as to what is able to cross through, a condition known as a ________ barrier.

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A:

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