Multiple Choice
Integral membrane proteins are proteins that:
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10. Lipids
Integral Membrane Proteins
Multiple Choice
Which of the following statements about integral proteins is NOT correct?
A
They are firmly associated with the membrane.
B
They contain hydrophobic regions that interact with hydrophobic lipid tails.
C
They can be easily extracted/separated from lipid membranes by just a relatively small change in the pH.
D
They commonly contain α-helices or multi-stranded β-barrels.
Verified step by step guidance1
Understand the nature of integral proteins: Integral proteins are embedded within the lipid bilayer of cell membranes and are characterized by their strong association with the membrane.
Recognize the structural features of integral proteins: These proteins typically have hydrophobic regions that interact with the hydrophobic tails of the lipid molecules in the membrane, allowing them to be stably integrated into the membrane structure.
Identify the structural motifs in integral proteins: Integral proteins often contain α-helices or β-barrels, which span the membrane and contribute to their stability and function.
Consider the methods of extraction: Integral proteins are not easily extracted from membranes. They require the use of detergents or other agents that disrupt the lipid bilayer, rather than simple changes in pH, to be removed.
Evaluate the statements: Based on the understanding of integral proteins, the statement that they can be easily extracted by a small change in pH is incorrect, as it contradicts the known methods required to extract these proteins from membranes.
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