Which of the following would you expect to find predominating in the plasma memb

Question

Which of the following would you expect to find predominating in the plasma membrane of a unicellular cukaryotic organism thriving in glacier iee? A) 20 carbon long saturated fatty acids. 10) 18 carbon long saturated fatty acids C) 20 carbon long fatty acids with 1 double bond. D) 18 carbon long fatty acids with I double bond ) 16 carbon long fatty acids with 3 double bonds 30) Cholesterol A) is found in abundance in prokaryotie cell membranes D) buffers membrane fluidity by increasing fluidity at low temperature and decreasing fluidity at high temperature. C) increases permeability for Ca2+, D) increases permeability for small polar molecules. E) All of the above are correct 31) Using a laser beam to inactivate fluorescence dye molecules connected to proteins or lipids on a cell membrane is called A) liposome formation B) electrophoresis. C) photobleaching. D) freeze-fracturing E) affinity labeling. 32) Which of the following types of protein would be most easily removed from a membrane by changing pH or ionic strength? A) GPI-anchored protein B) fatty acid-anchored protein C) integral protein D) peripheral protein E) glycosylated integral protein 33) The number and location of transmembrane segments in an integral membrane protein can be inferred from the amino acid sequence of the protein by a computer-generated A) Western blot. B) DNA sequence. C) freeze-fracture replica D) hydropathy plot E) prediction of glycosylation sites. 34) Cell-cell communication in plants takes place via specialized structures called A) plasmodesmata. B) chloroplast outer membrane pores C) gap junctions. D) lipid rafts. E) connexons Copyright © 2012 Pearson Education, Inc.

Explanation / Answer

29. 16 carbon long fatty acids with 3 double bonds

30. b The membrane will have increased fluidity at low temperatures and lower fluidity at high temperatures

31. Photobleaching

32. peripheral protein

33. Hydropathy plot. (a computer program identify clusters of hydrophobic amino acids)

Note: western blotting = used in electrophoresis to detected polypeptides

34. plasmodesmata

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