Microbiology With Diseases By Taxonomy (6th Edition)
6th Edition
ISBN: 9780134832302
Author: Robert W. Bauman Ph.D.
Publisher: PEARSON
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Phospholipids will spontaneously form bubbles of bi-layer when put into water. Why do they do this? Why is this shape particularly energetically favorable?
A phospholipid in cell membrane is an amphiphilic molecule, meaning it has both a hydrophilic region and a hydrophobic region. Suppose the phospholipid loses this property, what consequences will it bring to the cell.
Phospholipids are amphipathic. Explain with an example?
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- When a water droplet is placed in an oil solution, the phospholipids will form a micelle as shown. Explain why the phospholipids become organized in this way. Oil Waterarrow_forwardWhat is an example of a phospholipid bilayer?arrow_forwardHow are detergent molecules similar to phospholipid molecules in plasma membranes? Explain the mechanism that makes it possible for detergent molecules to get oil out of clothes. Include the terms hydrophobic and hydrophilic in your explanation.arrow_forward
- Which is a characteristic of the phospholipids in cell membranes? Select one: O Phospholipids in a membrane interact with other membrane molecules, in part, through covalent forces O Phospholipids in a membrane interact with other membrane molecules through non-covalent forces O Increasing the proportion of protein in a membrane increases the amount of membrane symmetry O Increasing the proportion of saturated fatty acids in a membrane increases membrane fluidity O A phospholipid molecule glows in the dark after exposure to visible lightarrow_forwardWhich of the following describes how regions of phospholipids are arranged in the cell membrane? Hydrophobic fatty acid regions are positioned toward polar environments. Hydrophilic phosphate regions are positioned toward nonpolar environments. Hydrophilic phosphate regions face each other within the interior of the cell membrane. Hydrophobic fatty acid regions face each other within the interior of the cell membrane.arrow_forwardHow would a cell membrane having phospholipids that contain a high percentage of oleic acid differ from a cell membrane having phospholipids that contain a high percentage of stearic acid?arrow_forward
- What causes phospholipids to spontaneously orient themselves into a membrane-like structure?arrow_forwardWhat is the order of the molecules on the following list according to their ability to diffuse through a lipid bilayer, beginning with the one that crosses the bilayer most readily. 1. Ca²+ 2. CO₂ 3. Ethanol 4. Glucose 5. RNA 6. H₂O A. Ethanol, Glucose, CO₂, H₂O, RNA, Ca²+ B. CO₂, Ethanol, Glucose, H₂O, Ca²+, RNA C. RNA, Glucose, Ethanol, H₂O, CO₂, Ca²+ D. Ca²+, CO₂, H₂O, Ethanol, Glucose, RNA *Recall that RNA stands for ribonucleic acids, and acids are negatively charged molecules in solutionarrow_forwardHow many phospholipid molecules are there in a 1-μm region of a phospholipid bilayer membrane? Assume that a phospholipid molecule occupies 70 Å of the surface area.arrow_forward
- Diagram 1 below illustrates a model of a phospholipid. Diagram 2 is a schematic of a single layer of water molecules in a rectangular dish. A. Describe or draw how phospholipid molecules will orient themselves if in contact with the water molecules in positions labeled A and B? B. Describe or draw how phospholipid molecules will orient themselves if in contact with the water molecules in positions labeled C? C. Explain the rationale behind your description or drawing.arrow_forwardWhich of the following serve as signaling molecules located along the membrane? Glycolipids Sphingolipids Phospholipids Sterol lipidsarrow_forwardWhat features in the chemical composition of phospholipids make them ideal components of the cytoplasmic membrane?arrow_forward
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