You've just discovered a prokaryotic organism that lives in extremely hot environments. Which of the following would you predict to be true about the phospholipids in its membranes? Select the best answer. Their hydrocarbon tails will be highly unsaturated. They will have a solid membrane. They will interact extensively with cholesterol. They will have extremely short hydrocarbon tails. Their hydrocarbon tails will be saturated.
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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?Which 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.A phospholipid has a head and two tails. The tails are found----- *
- Include a couple of paragraphs about Alkaline Phosphatase. Make sure you describe the following: a. Protein structure b. Cell location c. Reactions involved d. Functions in E. coli and humansWhich of the following is used in the reaction called saponification? A. Strong Base B. Hydrogen C. Strong acid D. Nickel Fatty acids contain in __ - hydrogen bonds, making them __. The Phosphate "head" in a phospholipid is __. The entire phospholipid molecule, therefore, is __. A. Carbon; hydrophobic; hydrophilic; amphiphilic B. Hydrogen; hydrophilic; hydrophilic; amphiphilic C. Carbon; hydrophilic; hydrophilic; hydrophobic D. Hydrogen; hydrophobic; hydrophobic; hydrophobicWhich of the following components are embedded across the phospholipid bilayer? Group of answer choices peripheral proteins carbohydrates integral proteins cholesterol
- A student uses iodine to visualize cells under the light microscope. Iodine stains starch deep blue and glycogen granules dark brown. Observation of the cells reveals the presence of cell walls, dark brown granules, mitochondria, and a prominent nucleus. If the chemical composition of the cell wall is determined, which of the following molecules would MOST likely be the major constituent? A. cellulose B. chitin C. lignin D. peptidoglycanWhich of the following is a true statement? Sphingolipids contain 2 hydrophobic, acyl chains Phospholipids contain 3 hydrophobic acyl chains Sphingolipids are completely no-polar, hydrophobic molecules The different types of phospholipids do not have different physical properties when in the membraneWhich of the following is true about phospholipid bilayers? The interior of the layer is highly hydrophilic. The hydrophobic tail faces the cell interior. The polar/hydrophilic tails face the cell interior and exterior. The polar/hydrophilic heads face the cell interior and exterior. The hydrophobic head faces the cell exterior.
- 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 bilayerA 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.Which of the following statements are acceptable and why? [Whereas all the carbohydrate in the plasma membrane faces outward on the external surface of the cell, all the carbohydrate on internal membranes faces toward the cytosol.] [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.]