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Questions and Answers
Proteins that function as carriers transport substances up electrochemical gradients by facilitated diffusion.
False
Ion channels, when activated, prohibit the passage of ions into or out of the cell.
False
Receptors that bind ligands or messenger molecules initiate physiologic changes outside the cell.
False
Proteins as enzymes catalyze reactions within the membrane, not at the surfaces of the membrane.
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One common way for peripheral proteins to attach to the membrane is through glycosylated forms of phosphatidylserine.
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The cell membrane is 7.5 micrometers thick.
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Phospholipids in the cell membrane have hydrophilic phosphate heads and hydrophobic fatty acid tails.
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Peripheral proteins pass through the cell membrane.
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Glycosphingolipids and sphingomyelin are types of proteins found in the cell membrane.
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Integral proteins in the cell membrane can function as pumps to transport ions across the membrane.
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