Kaiser - Exam 2 Multiple Choice Questions answers

Kaiser - Exam 2 Multiple Choice Questions answers - Kaiser...

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Kaiser Imam Current as of October 21, 2007 Biology 215 Exam 2 Review Practice Multiple Choice Questions 1. The ____ portion of the cell membrane functions as a barrier while the ____ portion determines specific functions, including pumps, receptors, adhesion, etc. A) carbohydrate, nucleic acid B) lipid, protein C) lipid, carbohydrate D) nucleic acid, lipid 2. Placing phospholipids into an aqueous solution immediately results in their forming a lipid bilayer. What is the driving force causing this ordered arrangement? A) The phospholipids are very ordered in water, and gain freedom of movement by forming a bilayer. B) Water, when associated with lipids, is forced into an ordered arrangement with fewer hydrogen bonds. Forcing lipids into a bilayer gains freedom of movement for the water. C) Phospholipids have a strong affinity for other phospholipids, leading to self assembly. D) None of the above 3. A sample of cells is placed in a salt solution. The cells shrink and the membrane is distorted. Relative to the cell, the solution is probably A) isotonic B) hypotonic C) osmotic D) hypertonic 4. Which component of a cell membrane is likely to function as a receptor in cell to cell signaling? A) Lipids B) Proteins C) Carbohydrates D) Cholesterol 5. Crossing a membrane by simple diffusion can be distinguished from facilitated diffusion because A) Simple diffusion does not require energy; facilitated diffusion requires a source of ATP. B) Simple diffusion can only move material in the direction of a concentration gradient; facilitated diffusion moves materials with and against a concentration gradient. C) Simple diffusion is not saturable; facilitated diffusion rates are limited by the number of functional membrane proteins and can be saturated. D) Simple diffusion is found only in prokaryotes while facilitated diffusion is found only in eukaryotes. 6. The major driving force for the formation of a lipid bilayer is _____; once formed the membrane is further stabilized by ________. A) electrostatic attractions between phospholipid head groups; hydrophobic forces and hydrogen bonds B) hydrophobic forces on the phospholipid fatty acid carbon chains; hydrogen bonds, electrostatic attractions, and van der Waals contacts 1
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C) repulsion between negative charges of phospholipid fatty acids; hydrogen bonds and van der Waals contacts D) van der Waals contacts between phospholipid charged groups; hydrophobic forces, hydrogen bonding and electrostatic attractions E) electrostatic attractions, hydrogen bonds, and van der Waals contacts; covalent bonds 7. The ability of a cell membrane to allow hydrophilic molecules to pass into a cell is determined by A) peripheral membrane proteins B) integral membrane proteins C) peripheral membrane carbohydrates D) integral membrane carbohydrates E) peripheral membrane lipids 8. Which of the following statements best describes the "fluid mosaic model" of the cell membrane? A) Two layers of protein with lipid layers between the protein layers
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Kaiser - Exam 2 Multiple Choice Questions answers - Kaiser...

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