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Membrane Structure and Function

Membrane Structure and Function
The model that is now known to be correct for the structure of biological membrane is

Page's model
Lac Operon model
Lock and Key model
Fluid mosaic model

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Membrane Structure and Function
Pinocytosis occurs in

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

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

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

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

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

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Membrane Structure and Function
Membrane lipids are

ampiphillic
none of these
hydrophobic
hydrophilic

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Membrane Structure and Function
Biological membranes are like water beds because

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

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