17167245
Description
Flashcards by Sam Gunnell, updated more than 1 year ago
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Created by Sam Gunnell
over 5 years ago
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| Question | Answer |
| What are the four compnents of a membrane? | Phospholipid Protien Cholesterol Glycocalyx |
| What makes up a phospholipid? | Glycerol, phosphate group and a fatty acid |
| What bond is formed between the fatty acids and glycerol of the phospholipid? | Ester bond |
| What is the function of a phospholipid? | Gives the membrane fluidity, barrier to large soluble water molecules and ions |
| What substances can pass through the phospholipid bilayer? | Lipid soluble molecules (hydrophobic) |
| How is excesive close packing prevented in the phospholipid bilayer? | Unsaturated fatty acids have kinks in the tails |
| What part of the phospholipid is hydrophillic/hydrophobic? | Hydrophillic head Hydrophobic tail |
| What are the two different types of protiens that can be in a membrane? | Intrinsic (goes all the way through the bilayer) Extrinsic (on one side) |
| What do the proteins do? | Provide support, transportation (carrier/channel proteins), helps cells adhere and hormone receptor site |
| What does cholesterol do? | Fits between fatty acids to make the barrier complete and reduces lateral movement of phospholipids giving membrane fluidity and stability |
| What is a glycocalyx? | A glycoprotein and glycolipid covering that surrounds the membrane |
| What are glycoproteins? | Carbohydrate chains attached to a protein |
| What are glycolipids? | Carbohydrate chains attached to phospholipids |
| What are the two parts of a glycocalyx? | Glycolipids and glycoproteins |
| What is the function of glycocalyx? | Receptor sites for hormones, helps cells adhere to form tissue and they form H bonds with water to stabalise proteins |
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