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Indietro

Lipids and Membranes

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Termini in questo insieme (15)

  • transporters

    Move specific substances across the membrane

  • Membrane Protiens

    Transporters, enzymes, cell surfaces, cell surfcae identy markers, cell to cell adhesion proteins

  • The Plasma Membrane

    —form the main fabric of the membrane, but proteins determine most of the membrane’s functions

  • The protein composition of membranes

    varies among cells within an organism, and among intracellular membranes within a cell

  • Cell membranes are selectively permeable

    —Allow some materials to move freely

    —

    —Restrict other materials

    —

    —Some small molecules move across the cell membrane using passive transport

    —

    —Some small molecules use active transport, which requires both energy and a transport protein

  • —Solvent

    —The liquid in which molecules are dissolved

  • —Solute

    The molecules dissolved in the solvent

  • —Concentration

    —The amount of a given solute per volume of solvent

  • —Gradient

    —A difference in concentration across a membrane

  • —Semifluid

    —Motion within membranes that is 2 dimensional

  • Permeability

    Permeability of the plasma membrane allows differentiation between the internal and external environment when certain molecules cross a selectively permeable membrane more easily than others

  • High permablity

    Gases, very small uncharged molecules

  • moderate permeability

    Water

  • low permeability

    ions and charged molecules

  • Factors that affect permeability

    1. Number of double bonds

    2. length of the tail

    3. number of cholesterol molecules

    4. temperature

    5. permeability