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Cu trc mng t boI.Key terms plasma membrane mng sinh cht phospholipid bilayer lp kp photpholipit

fluid mosaic model m hnh khm lnghydrophilic head ui a nchydrophobic tail ui k nchydrophilic region of protein !"ng a nc c#a proeinhydrophobic region of protein !"ng k nc c#a proteincytoplasmic layer lp ph$a t% bo cht c#a mnge&tracellular layer lp ngoi c#a mngunsaturated fatty acid a&it bo khng nosaturated fatty acid a&it bo no

unsaturated hydrocarbon tail ui hydrocarbon khng nosaturated hydrocarbon tail ui hydrocarbon no peripheral protein protein ngo'i !iintegral protein (rotein l)ng ghpfibers of e&tracellular matri& *+,-. c/c s0i c#a cht n1n ngo'i bocytoskeleton b2 khung t% boe&tracellular matri& *+,-. cht n1n ngo'i bofree3e4fractured k5 thu6t kh7c l'nh

II.Cc t in nn dng khi d ch ti !i"u89'c !i:t8;oole d ch8http>??tratu@soha@!n?dict?enA!n?

III.#ui$B. Come regions of the plasma membraneD calledlipid rafts D ha!e a higher concentrationof cholesterol molecules@ Es a resultD these lipid rafts

E. are more fluid than the surrounding membrane@F. are more rigid than the surrounding membrane@,. are able to flip from inside to outside@G. detach from the plasma membrane and clog arteries@+. ha!e higher rates of lateral diffusion of lipids and proteins into and out of the lipirafts@

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EnsHer> F

I. Cinger and JicolsonKs fluid mosaic model of the membrane proposed thatE. membranes are a phospholipid bilayer@

F. membranes are a phospholipid bilayer betHeen tHo layers of hydrophilic proteins@,. membranes are a single layer of phospholipids and proteins@G. membranes consist of protein molecules embedded in a fluid bilayer of phospholipid+. membranes consist of a mosaic of polysaccharides and proteins@EnsHer> G

L. Mhich of the folloHing types of molecules are the maNor structural components ofcell membraneOE. phospholipids and cellulose

F. nucleic acids and proteins,. phospholipids and proteinsG. proteins and cellulose+. glycoproteins and cholesterolEnsHer> ,

P. E

Q. Eccording to the fluid mosaic model of cell membranesD Hhich of the folloHing true statement about membrane phospholipidsO

E.

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+. E

BY. Mhich of the folloHing is true of integral membrane proteinsO

E.

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BP. E protein that spans the phospholipid bilayer one or more times isE. a transmembrane protein@F. an integral protein@

,. a peripheral protein@G. an integrin@+. a glycoprotein@EnsHer> E

BQ. Mhich of these are not embedded in the hydrophobic portion of the lipid bilayerallOE. transmembrane proteinsF. integral proteins

,. peripheral proteinsG. integrins+. glycoproteinsEnsHer> ,

BS. ,

BT. Un a paramecium*tr"ng roi.D cell surface integral proteins are synthesi3edE. in the cytoplasm by free ribosomes@F. by ribosomes in the nucleus@,. by ribosomes bound to the rough endoplasmic reticulum@

G. by ribosomes in the ;olgi !esicles@+. by ribosomes bound to the inner surface of the plasma membrane@EnsHer> ,

BV.Xnder Hhat conditions Hould a plasma membrane be the most fluid at LTZ,OE. long unsaturated fatty acyl tails plus cholesterol

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F. short unsaturated fatty acyl tails and no cholesterol,. short saturated fatty acyl tails and no cholesterolG. short unsaturated fatty acyl tails plus cholesterol+. long saturated fatty acyl tails plus cholesterol

EnsHer> FBW.AAAAAAAAAA is a lipid that helps stabili3e membranes of animal cells by refluidity as temperature changes@E.,holesterolF.(rostaglandins,.;lycerolG.E E

IY.Mhich of the folloHing statements best describes the chemical composition of plasmmembraneOE@ plasma membrane are bilayers of proteins Hith associated lipids and carbohydratesF@ plasma membrane are composed of tHo layersD one layer of phospholipids andlayer of proteins@,@ plasma membrane are bilayers of phospholipids Hith associated proteins acarbohydrates@G@ plasma membrane are composed of eRual numbers of phospholipidsD proteinscarbohydrates@+@ plasma membrane are composed of lipids Hith proteins attached to the outer surfac

EnsHer> ,@IB@,arbohydrates of the plasma membraneE@are associated Hith a protein or lipid@F@are located on the outer surface of the membrane@,@can function as cell markers for recognition by other cells@G@Ell of the abo!e@+@a and c onlyEnsHer> G

I%.&b'ecti(es

B@Gescribe the function of the plasma membrane@I@Gescribe the fluid properties of the cell membrane and e&plain hoH membrane fluis influenced by membrane composition@L@+&plain hoH hydrophobic interactions determine membrane structure and functionP@Gescribe hoH proteins contribute to membrane function@

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