Lecture 7 Questions

Lecture 7 Questions - 1 How are phospholipids constructed...

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1. How are phospholipids constructed and how do they differ in properties from triglycerides? What is a micelle? How are phospholipids put together to form a plasma membrane of a cell? How does the membrane restrict the movement of materials into and out of a cell? A phospholipid consists of two fatty acids attached to a glycerol. The third hydroxyl group of the glycerol is joined to a phosphate group. A triglyceride is composed of three fatty acids linked to one glycerol molecule. A micelle is a group of phospholipids. Phospholipids are put together in bilayers in a cell’s plasma membrane. The hydrophilic heads of the molecules are on the outside of the bilayer, in contact with the aqueous solutions inside and outside the cell. The membrane serves as a barrier to water and other polar and charged molecules. 2. What is the general structure of cholesterol? Why is cholesterol considered to be a lipid? Cholesterol is a steroid, and therefore consists of a carbon skeleton made up of 4 fused rings.
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Lecture 7 Questions - 1 How are phospholipids constructed...

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