ACTIVITY 8.2 Draw the different spontaneously formed lipid structures: a. Monolayers and bilayers b. Micelles c. Unilamellar vesicle d. Multilamellar vesicles
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- Biological Macromolecules Identifying molecules that could be in a cell membrane te for advanced students: none of these molecules are actually found in cell membranes. Your goal is to use the principles of biochemistry to dec ey could be, if for example they were synthesized and studied as drug candidates. 0 OH H₂N molecule Could be in a membrane? Membrane would be to the..? X CH3 O yes -left right- O no O yes - left right- по Ο O Oyes -left right→ О по Oyes -left right- Ono GCell Membrane and Cell Transport WebQuest Part I: Cell Membranes Go to the following website: www.biology4kids.com/ files/cell_membrane.html 1. How is the cell membrane similar to a plastic bag with tiny holes? 2. What two components make up the cell membrane? a. What are their functions? 3. What is the fluid mosaic model? 4. Sketch a section of the cell membrane, showing both phospholipids and proteins. Label your drawing. 5. Label the diagram of the phospholipid molecule below with the following terms: hydrophilic head, hydrophobic tail This diagram shows a Head simplified version of a phospholipid molecule. TailsRead This! When phospholipids are added to an aqueous environment (consisting mostly of water) the phospholipid molecules will spontaneously assemble into a phospholipid bilayer where the layers are held together by weak attractive forces between molecules. These structures are often seen in nature as cell and organelle membranes. 12. Consider animal cells, which are only bound by a cell membrane and plant cells which are bound by both a cell membrane and a cell wall. Are cell membranes flexible (fluid)? Provide specific examples to support your answer. 13. Explain why a phospholipid bilayer is flexible. terms of the strength of the forces that hold it together. 14. Refer to Model 1. a. What happens to the shape of the hydrophobic tail in a phospholipid when a double bond is present in the carbon chain? b. Explain why the flexibility (fluidity) of a membrane increases when more of the phospholipids in the layers contain double bonds. 15. The diagram below shows the chemical structure…
- Explain the impact of unsaturated fatty acid tails, cholesterol, and temperature on membrane fluidity. Model 1 – Phospholipids 5. Refer to Model 1. a.What happens to the shape of the hydrophobic tail in a phospholipid when a double bond is present in the carbon chain? b.Explain why the flexibility (fluidity) of a membrane increases when more of the phospholipids in the layers contain double bonds. c. Why might Arctic fish have a higher concentration of unsaturated fatty acids in their phospholipids?account_circle Science Anatomy and PhysiologyQ&A LibraryWhich of the following statements regarding the selective permeability of the lipid bilayer is FALSE? A. the permeability of the lipid bilayer to different substances varies. B. The lipid bilayer component of the plasma membrane is highly permeable to nonvolatile molecules such as oxygen. C. The more hydrophobic or lipid soluble a substance is, the greater the lipid bilayers permeability to that substance. D. The lipid bilayer component of the plasma membrane is moderately permeable to ions and large, uncharged polar molecules Which of the following statements regarding the selective permeability of the lipid bilayer is FALSE? A. the permeability of the lipid bilayer to different substances varies. B. The lipid bilayer component of the plasma membrane is highly permeable to nonvolatile molecules such as oxygen. C. The more hydrophobic or lipid soluble a substance is, the greater the lipid bilayers…fully describe the structure of a phospholipid bilayer as seen in a membranous structure, such as tonoplast. How are the phospholipid molecules oriented? What characteristics of phospholipids allow for the bilayer to form?
- A lipid bilayer was prepared from equal amounts of the following lipids: • 1-lauryl-2-palmitoylphosphatidylcholine • 1-myristoyl-2-linoleoylphosphatidylcholine Adding cholesterol to the lipid bilayer prepared above will most likely O decrease bilayer fluidity O increase bilayer fluidity have no effect on bilayer fluidity O destroy the bilayerMultiple Choice Question: Which of the following statements describes a general feature of the lipid bilayer in all biological membranes? O A. The bilayor is stabilized by covalent bonds between neighboring phospholipid molecules. O B. Triacyiglycerols are tho main structural components of each of the two monolayers in the bilayer. OC The polar head groups face inward toward the inside of the bilayet. O D. Individual lipid molecules are free to diffuse laterally in the surface of the bilayer OE Sodium ions and other small charged compounds readily diffuse across the bilayer OF. Individual lipid molecules in one façe (monolayer) of the bilayer readily dilfuse (1lip-fop) to the other monalayer1. Explain why phosphoglycerides are found in lipid bilayer 2. Enumerate and describe the mechanisms of transport across a membrane
- st Fall 2020 (page 1 of x A elearn.squ.edu.om/mod/quiz/attempt.php?attempt=1335328&cmid%3D697149 g System (Academic) al Biology 1 || tall20 Phospholipids are an essential component of the phospholipid bilayer necessary to the cell. Which of the following correctly represents a phospholipid subunit with the corresponding polarity? Select one: O a. Glycerol: nonpolar O b. Fatty acid head: nonpolar O c. Fatty acid tail: polar O d. Phosphate tail: polar O e. Fatty acid tail: nonpolarWhat's New Identify the different components of the cell membrane using the deacription given below. Use the appropriate number to locate each molecule. 1. Carbohydrate chain - 2 or more monosaccharide unit, either attached or branched found on the outside surface of the cell membrane. 2. Cholesterol found between the hydrophobic tails of the membrane phospholipid. 3. Glycolipid - carbohydrates attached to a lipid molecule. 4. Glycoprotein - carbohydrates attached to a protein molecule. 5. Integral Protein – protein embedded in the phospholipid bilayer that extend in both layers of the membrane. 6. Lipid Tail – the hydrophobic tail of the phospholipid facing the core of the membrane. 7. Peripheral Protein - protein found in the inner or outer surface of the membrane but not embedded on hydrophobic core. 8. Phosphate Head - globular hydrophilic head of the membrane.(a). Phospholipids are amphipathic molecules which have hydrophilic and hydrophobic regions. Explain how this feature benefits the cell. (Give ONE reason) (2) (b). Give ONE difference between a saturated phospholipid and an unsaturated phospholipid. (2)
