Topic 2 test questions answers

Topic 2 test questions answers - Study questions Topic 2...

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Study questions – Topic 2 Cell membranes Multiple choice questions (1 mark per answer) 1. A bacterium is suddenly expelled from a warm human intestine into cold water. Which of the following adjustments might the bacterium make to maintain the same level of membrane fluidity? (a) Increase the length of the hydrocarbon tails in its membrane phospholipids. (b) Increase the proportion of unsaturated hydrocarbon tails in its membrane phospholipids. (c) Increase the amount of cholesterol in the membrane. (d) Increase the proportion of hydrocarbon tails with no double bonds in its membrane phospholipids. (e) Both (b) and (c) would be appropriate responses for the bacterium to make to maintain the same level of membrane fluidity following the change in environment. 2. The plasma membrane of an animal cell is symmetric with respect to… (a) The distribution of different phospholipids in each leaflet of the lipid bilayer. (b) The orientation of membrane proteins in the lipid bilayer. (c) The distribution of cholesterol in each half of the lipid bilayer. (d) The distribution of GPI-linked proteins in each leaflet of the lipid bilayer. (e) All of the above 3. You are characterizing an isolated membrane protein. The protein is exposed on both sides of the membrane. Over much of the centre part of its surface, there are hydrophobic amino acids while the ends are hydrophilic. It crosses the membrane a number of times. There is an opening in the centre of this protein that is lined by hydrophilic amino acids. Which of the following statements best describes this protein and its function? (a) It is a peripheral membrane protein that serves to stabilize the structure of the membrane. (b)
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Topic 2 test questions answers - Study questions Topic 2...

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