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chapter 15
Membrane Transport and Cell Signaling
| Question | Answer |
|---|---|
| What is a PASSIVE process where molecules move from high concentration to low concentration? | Diffusion |
| What serves as markers to help distinguish one cell from another on animal membranes? | Sugars associated with glycoprotiens and glycolipids |
| What kinds of molecules pass through a cell membrane most easily? why? | small hyrdophobic because the inside of the phosolipid bilayer is hydrophobic |
| How do unsaturated fatty acids help keep any membrane more fluid at lower temperature? | the double bonds form kinks in the fatty acid tails that prevent adjacent lipids from packing tightly together (ex:unsaturated fatty acids in forms such as olive oil do not harden when cooled) |
| The primary structural components of the cell membrane are? | phospholipids and proteins (needed for transport) |
| Submerging a red blood cell in a hyper tonic solution will result in ? | shriveling of the cell |
| At human body temperature (37C) cholesterol in membranes function to : | make the membrane less fluid by restricting the movement of phospholipids |
| Water can move quickly through the plasma membrane of some cells because | it moves through aquaporin channel protiens |
| The cytoplasmic side of a cell membrane is negative in charge relative to the extracellular side. What is the voltage across the membrane called? | membrane potential |
| Which of the following is required for the sodium-potasium pump to transport potassium-ions into an animal cell? | energy from ATP |
Created by:
lpangbu
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