3 - membrane proteins Flashcards
Describe the fluid mosaic model of cell membranes.
What allows strong hydrophobic interactions that hold integral membrane proteins within the phospholipid bilayer?
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Some integral proteins are transmembrane proteins
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Peripheral membrane proteins have hydrophilic R groups on their surface and are bound to the surface of membranes, mainly by ionic and hydrogen bond interactions.
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Many peripheral membrane proteins interact with the surfaces of integral membrane proteins.
Describe the phospholipid bilayer as a barrier to ions and most uncharged polar molecules
Give examples of molecules which pass through the bilayer by simple diffusion
Describe the process of facilitated diffusion.
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to perform specialised functions, different cell types have different channel and transporter proteins.
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channels are multi-subunit proteins with the subunits arranged to form water-filled pores that extend across the membrane and most channel proteins in animal and plant cells are highly selective.
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Some channel proteins are gated and change conformation to allow or prevent diffusion.
Describe how ligand-gated channels function
Describe how voltage-gated channels function
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Transporter proteins bind to the specific substance to be transported and undergo a conformational change to transfer the solute across the membrane.
Describe the process of active transport
