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Cell Membrane Structure and Composition

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Questions and Answers

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?

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?

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?

Alkaline phosphatase Signup and view all the answers

What is the function of ion channel proteins?

To permit the passage of ions into or out of the cell when activated Signup and view all the answers

What is the primary structural arrangement of the cell membrane?

Lipid bilayer Signup and view all the answers

Which of the following is NOT a major lipid component of the cell membrane?

Triglycerides Signup and view all the answers

What property of lipids allows them to form the membrane structure?

Their amphipathic nature Signup and view all the answers

Which of the following is NOT a function of proteins in the cell membrane?

Photosynthesis Signup and view all the answers

What distinguishes integral proteins from peripheral proteins in the cell membrane?

Integral proteins pass through the membrane, while peripheral proteins are located on the surface Signup and view all the answers

Cell Membrane Structure and Composition

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Podcast

Questions and Answers

What is the primary function of proteins that act as carriers?

Which of the following is NOT a function of proteins mentioned in the text?

Where are the hydrophobic portions of membrane proteins typically located?

Which of the following is an example of a protein held by a glycosylphosphatidylinositol (GPI) anchor?

What is the function of ion channel proteins?

What is the primary structural arrangement of the cell membrane?

Which of the following is NOT a major lipid component of the cell membrane?

What property of lipids allows them to form the membrane structure?

Which of the following is NOT a function of proteins in the cell membrane?

What distinguishes integral proteins from peripheral proteins in the cell membrane?

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