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1. Cytology
Histology
| Question | Answer |
|---|---|
| What are the three main components of the plasma membrane? | Lipid, protein, and carbohydrates |
| Which is most predominant of these components? | Lipids are most numerous but proteins comprise the largest portion by weight. |
| Why is the plasma membrane often referred to as a trilaminar sheet or lipid bilayer? | Using electron microscopy it appears as 3 layers, two outer black layers (the heads of the phospholipid molecules) and a clear (non-lipid) layer (tails of the lipid molecules) inbetween. |
| Name the 4 major phospholipids found in the plasma membrane. Name an additional phospholipid only found in the inner leaflet of the membrane? | Phosphatidylcholine, phosphatidylserine, phosphatidylethanolamine, sphingomyelin and phosphatidylinositol. Phosphatidylinositol is only found in the inner leaflet. |
| What is a glycolipid and where are they found? | Phospholipids with a carbohydrate moiety attached to their head region. They are localized in only the external leaflet of the cell membrane |
| Which cell membranes contain no cholesterol as a form of lipid component? | Bacteria have no cholesterol in their cell membrane |
| What are the two main functions of the plasma membrane? | separates two aqueous environments (hydrophobic fatty acid chains)responsible for the membrane being impermeable to water-soluble molecules also phospholipids and proteins can diffuse laterally within the membrane to perform critical membrane functions |
Created by:
brasfait
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