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Active Lecture Questions for BIOLOGY, Eighth Edition Neil Campbell & Jane Reece Chapter 7 Membrane Structure and Function Questions prepared by Jung Choi, Georgia Institute of Technology Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Membrane Lipids and Fluidity An animal cell membrane will be more fluid at room temperature if it contains a) more cholesterol. b) longer chain fatty acids. c) more cis-unsaturated and polyunsaturated fatty acids. d) more trans-unsaturated fatty acids. e) any of the above Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Lipid Rafts, Cholesterol, and Membrane Fluidity Regions of the plasma membrane called “lipid rafts” have high concentrations of cholesterol. Consequently, the proteins in lipid rafts a) diffuse more freely in the membrane. b) tend to stay clustered together. c) are able to flip across the lipid bilayer from inside to outside and vice versa. d) cannot function as receptors. e) cannot undergo endocytosis. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Transmembrane Domains Which of the following amino acids would most likely be present in the transmembrane domain of an integral membrane protein? a) a charged amino acid like lysine b) a polar amino acid like serine c) a special amino acid like glycine or proline d) a hydrophobic amino acid like valine e) any of the above, with no preference Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Membrane Synthesis and Sidedness An oligosaccharide covalently linked to a lipid in the lumen of the rough ER may end up on the a) cytoplasmic face of the plasma membrane. b) extracellular face of the plasma membrane. c) cytoplasmic face of a secretory vesicle. d) any of the above Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Membrane Permeability Which of the following molecules will diffuse most quickly across a lipid bilayer membrane? a) H2O b) O2 c) H2PO4– d) glucose e) Na+ Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Osmosis If a marine algal cell is suddenly transferred from seawater to freshwater, the algal cell will initially a) lose water and decrease in volume. b) stay the same: neither absorb nor lose water. c) absorb water and increase in volume. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Transport Kinetics: Passive Diffusion Which of the curves below illustrates uptake of nitrous oxide into the cell, if nitrous oxide diffuses passively across the membrane? a) A b) B c) C Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Transport Kinetics: Passive Diffusion Which of the curves below illustrates uptake of lactose into the cell via a passive transporter? a) A b) B c) C Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Transport Kinetics: Passive Diffusion Which of the curves below illustrates uptake of phosphate into the cell by an active transport system? a) A b) B c) C Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings.