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Membrane Structure and Function

Membrane Structure and Function
In membranes, lipids are

glycerophospholipids
sphingolipids
sterols
all of these

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Membrane Structure and Function
The plasma membrane is a selectively permeable barrier due to presence of specific transport

amino acids
carbohydrates
none of these
proteins

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Membrane Structure and Function
Pinocytosis occurs in

mitochondria of all cells
none of these
all prokaryotic cells
all eukaryotic cells

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Membrane Structure and Function
Bacteriorhodopsin

is an integral membrane protein
contains primarily alpha-helical residues
All of these
absorbs light and pumps protons

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Membrane Structure and Function
Cholesterol is essential for normal membrane functions because it

spans the thickness of the bilayer
keeps membranes fluid.
cannot be made by higher organisms
plugs up the cardiac arteries of older men

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Membrane Structure and Function
The movement of molecules across a membrane by passive transport does not require

internal energy
vibrational energy
none of these
an input of metabolic energy

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