BIOL 1000 Study Guide - Midterm Guide: Membrane Transport Protein, Microtubule, Pinocytosis
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Document Summary
Fluid mosaic membrane: membranes consist of fluid lipid molecules in which proteins are embedded and float freely rather than being rigid and molecules locked in a space. The mosaic part refers to the fact that membranes contain a wide variety of different types of proteins and lipids, each with specific function. Proteins move more slowly in the fluid environment of the membrane because they they are larger than lipid molecules. Glycolipids and glycoproteins are formed as a result of the linkage of lipid and protein component of membrane to carbohydrates. Lipid molecules of all biological membranes exist in a double layer, called a bilayer. The molecules feely move around, side by side, and back and forth in the bilayer half. Myelin: functions to insulate nerve fibres, it is composed mostly of lipids and a little bit proteins. Depending upon the type of the membrane, the amount of proteins and lipids within the membrane differ.
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1.) Which of the following statement best describes how bacteriain a hot spring control the fluidity of their plasma membrane?
They decrease the percentage of lipids with unsaturatedhydrocarbon chains in their plasma membrane |
Because they don't synthesize cholesterol, they cannot controlmembrane fluidity and therefore have a very fluid plasmamembrane. |
They use cholesterol to prevent membranes from becoming toofluid. |
They form lipid rafts to prevent too much fluidity |
They increase the percentage of lipids with unsaturatedhydrocarbon chains in their plasma membrane. |
2.) Which activity can only be done by a transmembraneprotein?
To be phosphorylated |
To signal from one side of the membrane to the other |
To be glycosylated |
To associate with other proteins |
To bind transiently to a lipid bilayer |