13: Membranes and Membrane Proteins

Students analyze phospholipid bilayer structure, predict how composition affects membrane fluidity, classify integral and peripheral membrane proteins, and explain transport mechanisms.

LibreTexts reference: Unit 3, Chapter 4: Membranes and Membrane Proteins

True/False Statements About the Fluid Mosaic Model

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Which one of the following statements is FALSE about the fluid mosaic model of membrane lipid bilayers?

• A. The plasma membrane provides mechanical support to the cell
• B. The plasma membrane is composed of a variety of lipids and proteins.
• C. The plasma membrane separates the interior of the cell from the external environment
• D. The plasma membrane is a flexible barrier

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True/False Statements About Membrane Diffusion

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Which one of the following atoms/molecules would readily pass through the lipid membrane?

• A. potassium ions, K⁺
• B. galactose sugars
• C. testosterone steriods
• D. arginine amino acids
• E. thymine nucleotides

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True/False Statements About Membrane Protein Functions

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Which one of the following statements is FALSE regarding functions of membrane proteins?

• A. Some membrane proteins anchor the cytoskeleton to the plasma membrane
• B. They create intercellular junctions between adjacent cells
• C. They receive cell signals and transduce them across the membrane
• D. They recognize and bind to other cells or substances
• E. They prevent the passage of hydrophobic substances across the membrane

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