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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

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

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

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

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Membrane Structure and Function
The mesosomes may be the sites of

DNA replication and specialized enzymatic reactions
None of these
RNA replications and specialized cyclic reactions
RNA replications and specialized enzymatic reactions

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

cholesterol
carbohydrates
integral proteins
hydrophobic molecules

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

amino acid synthesis
protein synthesis
phospholipid synthesis
carbohydrate synthesis

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

carbohydrates
none of these
amino acids
proteins

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