In an integral membrane protein, which of the amino acids below is most likely to be found in the interfacial region of the bilayer? Group of answer choices Lys Ala Phe Leu
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- The tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a. phosphate groups; hydrophobic b. fatty acid groups; hydrophilic c. phosphate groups; hydrophilic d. fatty acid groups; hydrophobicMembrane proteins move laterally in a phospholipid bilayer but generally not up and down. Why would this be so?Integral membrane proteins are anchored in lipid bilayers. Which of the following groups of amino acid residues would likely be found in the portion that crosses the lipid bilayer? Nonpolar Polar Acidic Charged
- b) Cellular membranes are generally found in environments that contain lots of water. Draw a diagram of what the phospholipid bilayer of a plasma membrane would look like if it were placed in a hydrophobic environment. (**Note that you only have to draw the phospholipid bilayer, you don't have to draw the other major components again as you did in part a) poned In salt wer (ho byorout obods f.Cplan why sctive tnsport is requind in tive tre nolaib beisio c) What part or parts of a cellular membrane play(s) a role in determining the fluidity of the membrane? pslomlo belowThe plasma membrane of E. coli is about 75% protein and 25% phospholipid by weight. How many molecules of membrane lipid are present for each molecule of membrane protein? Assume an average protein Mr of 50,000and an average phospholipid Mr of 750. What more would you need to know to estimate the fraction of the membrane surface that is covered by lipids?Besides lipid molecules, cell membranes also contain many different types of proteins, each with specific functions. In the following table, select the common type of membrane protein in the right-hand column that each statement in the left-hand column describes. The choices on the Type of Membrane Protein are the same for theFunction of the Membrane Protein
- What typical structure[s] is/are found in integral membrane proteins – how do they span themembrane?Drawn below is a schematic of a transmembrane protein. Extracellular Cell membrane Cytosolic side (a) From the list below, select the amino acid(s) that might by more common in the extracellular domain of this membrane protein and whose side- chain can form hydrogen bonds with the surrounding water molecules. Explain why you selected this option(s). Lysine Serine Phenylalanine Methionine (b) From the list below, select the amino acid(s) that would likely be found in the transmembrane/ membrane spanning domain of this protein and whose side- chain interacts with the lipid bilayer. Lysine Serine Phenylalanine MethionineThe cell membrane is made up of many different kinds of proteins. These proteins can be clannified as either peripheral, transmembrane, or lipid-anchored proteins. Regardiess of their classification, these proteins all play an important role in the function and integrity of a cell. Which of the following properly describes the function of membrane proteins? Select all that apply. View Avalabie Hint(s) to combine with lipids to form strong shels that prevent the movement of substances across the membrane O to allow for cel-cell communication O to provide structural stability for the cell O to provide a seiective barrier O to provide fluidity to the membrane O to combine with a carbohydrate, providing an immune response andbor cell recognition O to serve as a channel for the transport of molecules between extracelular and intracellular fluid
- The fluid mosaic model of membrane structure has been very useful in explaining membrane behavior. However, the description of membrane as proteins floating in a phospholipid sea is oversimplified. Describe some components of membrane that are restricted in their lateral motion.Many transmembrane proteins are oligomeric, with several identical subunits. The oligonmers are usually found to have some form of C, symmetry, rather than D, or any higher order. Suggest a reason for this observation.Explain how the amphipathic (containing both hydrophobic and hydrophilic sides) protein (shown; left)would be anchored in the phospholipid bilayer (shown; right); which portion do you predict would besticking out towards the water? Which portion would be hiding inside the membrane?