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Questions and Answers
What is the primary function of proteins that act as carriers?
What is the primary function of proteins that act as carriers?
- To transport substances down electrochemical gradients by facilitated diffusion (correct)
- To initiate physiologic changes inside the cell upon binding ligands
- To catalyze reactions at the membrane surfaces
- To permit the passage of ions into or out of the cell
Which of the following is NOT a function of proteins mentioned in the text?
Which of the following is NOT a function of proteins mentioned in the text?
- Catalyzing reactions at the membrane surfaces
- Regulating gene expression (correct)
- Functioning as ion channels
- Acting as receptors that bind ligands
Where are the hydrophobic portions of membrane proteins typically located?
Where are the hydrophobic portions of membrane proteins typically located?
- In the cytosol
- In the extracellular matrix
- On the surfaces of the membrane
- In the interior of the membrane (correct)
Which of the following is an example of a protein held by a glycosylphosphatidylinositol (GPI) anchor?
Which of the following is an example of a protein held by a glycosylphosphatidylinositol (GPI) anchor?
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What is the function of ion channel proteins?
What is the function of ion channel proteins?
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What is the primary structural arrangement of the cell membrane?
What is the primary structural arrangement of the cell membrane?
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Which of the following is NOT a major lipid component of the cell membrane?
Which of the following is NOT a major lipid component of the cell membrane?
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What property of lipids allows them to form the membrane structure?
What property of lipids allows them to form the membrane structure?
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Which of the following is NOT a function of proteins in the cell membrane?
Which of the following is NOT a function of proteins in the cell membrane?
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What distinguishes integral proteins from peripheral proteins in the cell membrane?
What distinguishes integral proteins from peripheral proteins in the cell membrane?
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