Scramblase - ANSWERSEvens out number of lipids in bilayer (Smooth ER).
Lipid rafts - ANSWERSAreas of concentrated lipids on the plasma membrane that are involved in cell
signaling.
passive transport - ANSWERSMolecules that are membrane permeable can move across the plasma
membrane through simple diffusion. Occurs spontaneously down an electrochemical gradient. Both
carrier and channels can mediate transport.
channel proteins - ANSWERS• Form a narrow hydrophilic pore
• Allows diffusion of specific ions along their electrochemical gradients.
Carrier proteins - ANSWERS• Transport specific molecules across the membrane.
• Undergo conformational changes when they bind the molecule to be transported
• Can carry a molecule along or [against] its electrochemical gradient.
Simple diffusion - ANSWERSsmall, uncharged solutes can directly cross the lipid bilayer.
Active transport - ANSWERStransport against electrochemical gradients, requires energy.
Na+ driven glucose pump - ANSWERSuses co-transport of Na+ to facilitate transport of glucose.
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