A bilyer arrangement of phospholipids in the cell membrane increases the strength of .......... forces among phospholipids.  1- Hydrophobic  2- Covalent  3- Van der Walls  4- Hydrogen bonding

The fatty acids below can be esterified to a glycerol molecule to form glycerophospholipids that, in turn, could aggregate to form a lipid bilayer. Arrange the fatty acids starting from which fatty acid will produce the least rigid bilayer going to the fatty acid that will produce the most rigid bilayer. • 14:0 • 12:0 • 22:0 • 18:0 O 12:0 < 18:0 < 14:0 < 22:0 O 14:0 < 12:0 < 22:0 < 18:0 O 22:0 < 18:0 < 14:0 < 12:0 O 12:0 < 14:0 < 18:0 < 22:0

If you added many phospholipids to some water, they would spontaneously orient themselves into something resembling a membrane! Describe why this occurs.

We have seen that biological membranes have both lipid and protein components. How do these two parts combine to produce a biological membrane?

Define the term phospholipids?

For biological membranes, which of the following statement is NOT true? A. The phospholipid bilayer is a fluid matrix. B. Protein can be anchored to the membrane by covalently linked lipid chains. C. Proteins can move laterally across the membrane. D. For organisms living in cold temperature, their cell membranes contain more triacylglycerols. E. Transverse motion of lipid molecules can occur occasionally.   Enzyme lowers when... A. The energy difference between the substrate and the transition state B. The energy difference between the product and the transition state C. Both A and B D. Neither A nor B

1.

Which of the following choice/s will best complete the statement below: For bilayers that have a high proportion of fatty acid derivatives, adding cholesterol will most likely the fluidity of the bilayer. unsaturated; increase saturated; increase saturated; decrease O unsaturated; decrease

Which of the following statements is (are) consistent with what is known about membranes? (a) A membrane consists of a layer of proteins sandwiched between two layers of lipids. (b) The compositions of the inner and outer lipid layers are the same in any individual membrane. (c) Membranes contain glycolipids and glycoproteins. (d) Lipid bilayers are an important component of membranes. (e) Covalent bonding takes place between lipids and proteins in most membranes.

b) Cellular membranes are generally found in environments that contain lots of water. Draw a diagram of what the phospholipid bilayer of a plasma membrane would look like if it were placed in a hydrophobic environment. (**Note that you only have to draw the phospholipid bilayer, you don't have to draw the other major components again as you did in part a) poned In salt wer (ho byorout obods f.Cplan why sctive tnsport is requind in tive tre nolaib beisio c) What part or parts of a cellular membrane play(s) a role in determining the fluidity of the membrane? pslomlo below