Biological membranes are often described using the fluid mosaic model. What are three defining characteristics of this model.
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Biological membranes are often described using the fluid mosaic model. What are three defining characteristics of this model.
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- Give the Similarities and Differences between the following terms. Make sure to give at least Two Differences: Terms Similarity Difference Endocytosis/Exocytosis Difference Terms Similarity Diffusion/Osmosis Difference Similarity Terms Pinocytosis/PhagocytosisDiscuss the physical properties of a membrane, the movement of its phospholipids and proteins– explain the fluid mosaic model.Below are listed molecules with different chemical characteristics. Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the list that most accurately predicts the relative rates of diffusion of these molecules (fastest to slowest) across a biological membrane. alanine, propanol, sodium, estrogen sodium, propanol, alanine, estrogen estrogen, propanol, sodium, alanine estrogen, propanol, alanine, sodium
- Proteins may be bound to the exoplasmic or cytosolic face of the plasma membrane by way of covalently attached lipids. What are the three types of lipid anchors responsible for tethering proteins to the plasma-membrane bilayer? Which type is used by cell-surface proteins that face the external medium? By glycosylated proteoglycans?"Although lipid molecules are free to diffuse in the plane of the bilayer, they cannot flip-flop across the bilayer unless enzyme catalysts called phospholipid translocators are present in the membrane", is true or false.Please label this red onion cell image with a drop of water under the microscope. Include all relevant labels including: nucleus, cell wall, cell membrane, cytosol, vacuole, etc. Kindly explain why there's a large white stop at the top and bottom left. What conclusions do you draw from these results? Discuss this by referring to what type of solution this would be considered (eg. hypertonic, hypotonic or isotonic).
- An artificial cell consisting of an aqueous solution enclosed in a selectively permeable membrane (but with no cell wall) is immersed in a beaker containing an aqueous solution. The outside environment concentration consists of 0.01 M glucose and the inside of the cell has a concentration of 5.0 M glucose. The plasma membrane is permeable to water and monosaccharides, but impermeable to the disaccharides. Complete the following for the image below: Will the artificial cell become lyse, shrivel, or stay the same? lyse shrivel stay the sameAn artificial cell consisting of an aqueous solution enclosed in a selectively permeable membrane (but with no cell wall) is immersed in a beaker containing an aqueous solution. The outside environment concentration consists of 0.01 M glucose and the inside of the cell has a concentration of 5.0 M glucose. The plasma membrane is permeable to water and monosaccharides, but impermeable to the disaccharides. Complete the following for the image below: Is the glucose going down or against its concentration gradient? Is the movement of the solute in the cell going out of the cell? Down...Yes Down...No Against...Yes Against...NoWhich of the following is true about integral proteins according to the fluid mosaic model? Integral proteins are embedded in the phospholipid bilayer. Integral proteins are free to leave the membrane. Integral proteins often undergo flip-flop movement. Integral proteins may attach to cholesterol.
- An artificial cell consisting of an aqueous solution enclosed in a selectively permeable membrane (but with no cell wall) is immersed in a beaker containing an aqueous solution. The outside environment concentration consists of 0.01 M glucose and the inside of the cell has a concentration of 5.0 M glucose. The plasma membrane is permeable to water and monosaccharides, but impermeable to the disaccharides. Complete the following for the image below: Is the solution inside the cell isotonic, hypotonic, or hypertonic? Is the glucose going down or against its concentration gradient? Draw solid arrow to indicate the movement of the solute into or out of the cell. Draw a dashed arrow to show the movement of water. Will the artificial cell become lyse, shrivel, or stay the same?Ammonia (NH3) is a weak base that under acidic conditions becomes protonated to the ammonium ion in the following reaction: NH3 + H+ → NH+4 NH3 freely permeates biological membranes, including those of lysosomes. The lysosome is a subcellular organelle with a pH of about 4.5–5.0; the pH of cytoplasm is about 7.0. What is the effect on the pH of the fluid content of lyso- somes when cells are exposed to ammonia? Note: Ammo- nium (NH4+) does not diffuse freely across membranes.Explain the fluid mosaic model of the cell membranes. Which component of cell membrane is responsible for its fluidity.
