Cell bio chpt 11

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    What is the function of cell membranes?

    Act as selective barriers to control molecule movement.

    How do hydrophilic and hydrophobic molecules differ?

    Hydrophilic dissolve in water; hydrophobic do not.

    What are lipid rafts?

    Specialized membrane domains that organize signaling molecules.

    What role do phospholipids play in membranes?

    Form the bilayer structure due to their amphipathic nature.

    What happens to membrane fluidity with shorter hydrocarbon tails?

    Fluidity increases due to decreased tail interactions.

    What is the significance of cholesterol in membranes?

    Stiffens the membrane and maintains its fluidity.

    What distinguishes transmembrane proteins?

    They span the membrane and have both hydrophobic and hydrophilic regions.

    What is the function of glycoproteins in the plasma membrane?

    Form a carbohydrate layer for protection and cell recognition.

    How do tight junctions affect membrane protein distribution?

    Create barriers that restrict protein movement to specific areas.

    What is the role of flippases in membrane dynamics?

    Catalyze the transfer of phospholipids between bilayer layers.

    What is the consequence of membrane asymmetry?

    Different lipid compositions on each side influence function.

    What is the primary function of the cell cortex?

    Provides structural support to the plasma membrane.

    What happens if membrane proteins are tethered?

    Their movement is restricted to specific membrane domains.

    What is the implication of amphipathic molecules in membranes?

    They facilitate the formation of lipid bilayers.

    What occurs during new membrane synthesis?

    Membranes are formed in the ER and transported via vesicles.