Cholesterol plays the role of membrane "buffer" in modulating membrane fluidity.
Explain how this steroid lipid carries out that role in the membrane. (Be sure to indicate how the structure of cholesterol is important for its buffer function)
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Cholesterol plays the role of membrane "buffer" in modulating membrane fluidity. Explain how this steroid lipid...
Explain how cholesterol within the plasma membranes of animals affects membrane fluidity at different temperatures.
Begin by describing the basic structure of cholesterol. Then indicate how this crucial lipid is positioned within a lipid bilayer. Explain the effect upon the Tm of the membrane if the cholesterol concentration was increased.
19. The degree of membrane fluidity depends on . the percentage of lipids that contain choline b. the percentage of glycolipids c. the percentage of faty acids d the percentage of unsaturated farty acids Membeane proteins can be located a. entirely within the membrane b on the surface of the membeane c. in either position d. the position cannot be determined 20. 21. Which property has not been observed for membrane proseins? a energy storage b. transport of substances into...
Depletion of cholesterol in the cell membrane using a drug (mevastatin) has been associated with apoptosis in cancer cells. a. What effect would cholesterol depletion have on the integrity of lipid rafts in the membrane? b. Researchers found that FAS death receptor was activated in cholesterol depleted cancer cells. Explain how activation of this receptor activates killer caspases. c. When a caspase is converted from its inactive to its active form there are changes in the primary and tertiary structure...
toyer loses its fluidity when it freezes aquaporins can no longer function after freezing. O the integrity of the lipid bilayer is broken when the membrane freezes. QUESTION 9 What are the membrane structures that function in active transport? peripheral proteins O carbohydrates cholesterol integral proteins cytoskeleton filaments QUESTION 10 Which of the following is true of integral membrane proteins? They are loosely bound to the surface of the blayer They are not mobile within the bayer They lack tertiary...
Explain how the Geometric structure of a Biological molecule plays a role in its function.
Please explain. Many times cholesterol is viewed as a molecule that has harmful effects on the health of one's cardiovascular system. Contrary to what many may believe, cholesterol is a very important molecule that serves a vital function within the cell membrane. Cholesterol most important role is in: The maintenance of the structure of the bilayer by increasing membrane permeability. The maintenance of the structure of the bilayer by decreasing membrane permeability. Providing the sole anchor point for membrane proteins...
21. Which property has not been observed for membrane proteins? a. energy storage b. transport of substances into and out of the cell catalysis (enzymatic activity) acting as a receptor c. d. 22. In the fluid mosaic model of membrane structure the proteins are specifically bonded to the lipids b. a. the proteins "float" in the lipid bilayer the proteins are sandwiched between the lipid molecules c. d. the lipids are sandwiched between the protein molecules 23. All steroids contain...
Define a buffer and explain how a buffer works. [Note: be sure to address the role of conjugate salts.] Analyze and explain the buffer system in buffered aspirin (carboxylic acid).
MEMBRANE STRUCTURE AND TRANSPORT ACROSS CELL MEMBRANES 1. An organelle that is characterized by extensive, folded membranes and is often associated with ribosomes 2. Label the following diagram Qutsde of cel LE nside of cell 3. List 4 functions of the plasma membrane c. d. 4. Complete the table below with the role cach component of the plasma membrane plays Plasma membrane components Role in the membrane Phospholipid Bilayer Cholesterol Glycopeoteins Glycolipids Protein Receptor Site Protein channel Protein Carrier 5....