Answer_keys_Ch11-12 - Answers to practice questions Chapter...

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Answers to practice questions Chapter 11. 1. e 2. c 3. a 4. proteins, amphipathic, lipid bilayer, fatty acid tails, hydrophilic head groups, phospholipids, sugars 5. d (but in the ER membrane, redistribution of phospholipids to the bilayer is carried out by a non-specific flippase, scramblase. The asymmetry of the bilayer is maintained by specific redistribution by flippases, in general.) 6. c 7. a 8. 3 and 6 9. transmembrane, hydrophobic, amphipathic, covalently, peripheral 10. e 11. a (You do not have to remember one-letter abbreviations for the 20 amino acids) 12. a 13. b, d, e 14. e 15. 1): d, 2): f 16. c 17. Tethered to the cell cortex, tethered to extracellular matrix molecules, tethered to molecules in another cell, diffusion barrier (Figure 11-33) 18. c 19. a 20. d 21. b 22. b 23. A: true, B: false (phosphatidylcholine is the most abundant phospholipid.) C: true, D: false (formation of lipid bilayer is favorable in water.) 24. A: SDS is a strong ionic detergent. SDS extracts proteins out from the membrane and completely unfolds them. It is impossible to do functional study of the denatured proteins. B: Triton X-100 is a mild detergent having a polar but uncharged portion. Triton X-100 forms a shell around the hydrophobic region of the protein without denaturing. This allows functional characterization of the protein because the protein is in a new, synthetic membrane bilayer. 25.
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This note was uploaded on 11/21/2011 for the course PCB 3134 taught by Professor Multiple during the Fall '08 term at University of Florida.

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Answer_keys_Ch11-12 - Answers to practice questions Chapter...

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