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Practice - Membrane Structure 2 quiz

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  • What does a hydropathy plot predict about a protein sequence?
    A hydropathy plot predicts whether a protein sequence contains membrane-spanning segments by identifying hydrophobic regions.
  • How many amino acids are typically needed to span a membrane in a hydropathy plot?
    About 20 amino acids are needed to span a membrane, with a hydrophobic region indicating a membrane-spanning segment.
  • What does the positive region of a hydropathy plot represent?
    The positive region represents hydrophobic segments of the protein.
  • What does the negative region of a hydropathy plot indicate?
    The negative region indicates hydrophilic segments of the protein.
  • How does increasing temperature affect membrane fluidity?
    Increasing temperature increases the fluidity of the lipid bilayer.
  • What effect do unsaturated fatty acids have on membrane fluidity?
    Unsaturated fatty acids increase membrane fluidity because they have lower melting points.
  • How does the length of alkyl chains influence membrane fluidity?
    Longer alkyl chains decrease membrane fluidity due to higher melting points.
  • What happens to membrane fluidity when saturated fatty acids are substituted for unsaturated ones?
    Substituting saturated fatty acids for unsaturated ones decreases membrane fluidity.
  • How are peripheral membrane proteins typically associated with the membrane?
    Peripheral membrane proteins are non-covalently bound, mainly via hydrophobic interactions.
  • Do peripheral membrane proteins penetrate deeply into the lipid bilayer?
    No, peripheral membrane proteins are loosely bound and do not penetrate deeply into the lipid bilayer.
  • Can peripheral membrane proteins have functional units on both sides of the membrane?
    No, they are located on only one side of the membrane.
  • Are peripheral membrane proteins usually denatured when released from membranes?
    No, they are not usually denatured because they are not deeply associated with the membrane.
  • What is the minimum window size of amino acids to look for in a hydropathy plot for membrane spanning?
    A window of about 20 amino acids in the hydrophobic region is used to identify membrane-spanning segments.
  • What is the effect of decreasing the number of unsaturated fatty acids on membrane fluidity?
    Decreasing unsaturated fatty acids lowers membrane fluidity.
  • How can peripheral membrane proteins be released from membranes?
    Peripheral membrane proteins can be released by treatment with detergents.