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Membrane Structure and Function

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

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

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Membrane Structure and Function
The smooth endoplasmic reticulum (SER) is the site of

amino acid synthesis
carbohydrate synthesis
protein synthesis
phospholipid synthesis

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Membrane Structure and Function
In membranes, lipids are

glycerophospholipids
all of these
sphingolipids
sterols

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Membrane Structure and Function
Bacteriorhodopsin

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

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

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

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Membrane Structure and Function
Which type of molecule spans the membrane, from its inner to outer surface according to the Fluid mosaic model of cell membranes?

Carbohydrate
Phospholipid
Protein
Cholesterol

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