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Membrane Structure and Function

Membrane Structure and Function
Pinocytosis occurs in

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

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

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

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Membrane Structure and Function
In active transport, the membrane structure that functions is

integral proteins
hydrophobic molecules
cholesterol
carbohydrates

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Membrane Structure and Function
Biological membranes are like water beds because

the membrane is thin compared to the enclosed volume
All of these
they are always moving
they (normally) do not leak their contents

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Membrane Structure and Function
Bacteriorhodopsin

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

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

proteins
amino acids
carbohydrates
none of these

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