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Can anybody suggest mixtures of phospholipids and/or sterols to better mimic plant plasma membranes?
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- 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?4. In the center box below, draw any generic cell membrane with at least 6 phospholipids in a neutral temperature environment 5. Now imagine that a cell with that membrane is exposed to a much hotter environment, but the composition of its membrane remains the same. In the box on the right, label if the membrane will be more fluid or more rigid in the hot environment compared to the neutral environment. 6. Starting again with a cell with the membrane in the neutral environment in the center, imagine that cell is exposed to a much colder environment, but the composition of its membrane remains the same. In the box to the left, label if the membrane will be more fluid or more rigid in the cold environment compared to the neutral environment. 6. Cold environment 4. Neutral environment 5. Hot environment More Fluid or Rigid (circle one) More Fluid or Rigid (circle one)A biochemist grinds up a sample of plant roots, fungal mycorrhizae, and soil-dwelling arthropods. They then extract a mix of several polymeric molecules. Of the polymers found within the sample, which of the following molecules is least likely to be used as a component of a cell wall? Group of answer choices A. Chitin B. Glucan C. Starch D. Cellulose
- Consider molecule #1. How would these molecules arrange themselves when added to water? A. Would dissolve in water B. Would form a micelle C. Would form a bilayerPlants are often subjected to warm temperatures. How might they adjust their cell membranes to deal with these temperature changes? (Choose All That Apply) change the type of DNA that is found in the membrane increase the amount of unsaturated fatty acids in the phospholipids increase the amount of saturated fats in the membrane increase the amount of sterols found in the membrane Please highlight the correct answerPlants are often subjected to warm temperatures. How might they adjust their cell membranes to deal with these temperature changes? (Choose All That Apply) There's more than one correct answer. change the type of DNA that is found in the membrane increase the amount of unsaturated fatty acids in the phospholipids increase the amount of saturated fats in the membrane increase the amount of sterols found in the membrane Please highlight the correct answer
- Electrical gradients ( potential; charges) exists on cell membranes because in part when the cell is at rest... a.The inner surface surface of the cell membrane is more negatively charged than the outer surface. b. the inner surface of the cell membrane is more positively charged than the outer surface. c. The membrane as a whole is hydrophilic on the outside. d. the membrane as a whole is hydrophobic on the outside e.None of the abovea. You selectively label phospholipids with a fluorescent dye and perform the FRAP assay. You detect a single fluorescence molecule move 100 micrometre into the photobleached area in 2.5 seconds. What is the diffusivity constant for this phospholipid? b. Increasing the ratio of unsaturated to saturated phospholipids in a biological membrane increases membrane fluidity. Describe how the FRAP photobleaching and recovery curves would differ between membranes with 63% and 41% unsaturated phospholipids. c. Draw the FRAP photobleaching and recovery curves for your answer in b. d. What does the “immobile fraction” in a FRAP experiment suggest (see diagram)?Thinking about bacterial cell membranes, which of the following statements is True. Select one: a.None of the Above b.NAG and NAM subunits are used as the building block for some bilayer membranes. c.Phospholipids are composed of a polar head and hydrophobic tails. d.Most bacteria will use only unsaturated fatty acids to create their cell membranes. e.Saturated fatty acids put a bend or kink in the cell memrane, making it more fluid.
- 2. Use the following vocabulary to label and draw a cell membrane: cytoplasm (cell lumen) extra-cellular fluid hydrophobic hydrophilic polar head non-polar tails a) How many O-H groups are there? And are the O-H areas of sucrose polar or non-polar? b) What is the term that is used to discuss how tightly or loosely an atom's nucleus has a hold of its valence electrons? c) Do you think any water molecules move in the opposite direction of the arrow? Explane your answer in detail.The plasma membrane is said to be a fluid-mosaic model because it contains a. waxes suspended within a mosaic of phospholipids.b. a mosaic of proteins suspended within a phospholipid bilayer.c. a polysaccharide mosaic suspended within a protein bilayer.d. a mosaic of phospholipids suspended within a protein bilayer.What would be the difference between the way animal and plant cells react in each of the solutions?
