Which of the following would you expect to be freely permeable through a pure lipid bilayer? molecular nitrogen fructose ATP sodium ions helium glucose glycine carbon dioxide
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Which of the following would you expect to be freely permeable through a pure lipid bilayer?
molecular nitrogen
fructose
ATP
sodium ions
helium
glucose
glycine
carbon dioxide
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- Which of the following molecules can normally cross a phospholipid bilayer by simple diffusion? O Oxygen O Potassium ion (K+) O Methionine O GlucoseFor the lipids within the bilayer that comprise the plasma membrane: O The hydrophilic ends face outside (extracellular/exoplasmic face) and inside (cytoplasmic face) of the cells, with hydrophobic ends buried in the center of the lipid bilayer. The hydrophobic ends face outside (extracellular/exoplasmic face) and inside (cytoplasmic face) of the cells, with hydrophilic ends buried in the center of the lipid bilayer. The hydrophilic ends face the outside (extracellular/exoplasmic face) of the cells and the hydrophobic ends face inside (cytoplasmic face) of the cells. O Hydrophobic and hydrophilic ends face outside (extracellular/exoplasmic face) and inside (cytoplasmic face) of the cells randomly. The hydrophobic ends face the outside (extracellular/exoplasmic face) of the cells, the hydrophilic ends face inside (cytoplasmic face) of the cells.It seems paradoxical that a lipid bilayer can be fluid yet asymmetrical. Explain.
- For each of the following sentences, fill in the blanks with the best word or phrase selected from the dropdown list. Not all words or phrases will be used; each word or phrase should be used only once. The backbone amino group of every amino acid in an a-helix form a hydrogen bond with backbone carbonyl group of the amino acid four positions away. Therefore, the protein backbone is [Select] of the helix, with the amino acid side chains [Select] of the helix. For a single-pass transmembrane protein, the amino acids in the transmembrane segment have [Select] ✓side chains.List the following compounds in order of increasing lipid bilayer permeability: RNA, Ca2+, glucose, ethanol, n2, water.A lipid bilayer was prepared from equal amounts of the following lipids: • 1-lauryl-2-palmitoylphosphatidylcholine • 1-myristoyl-2-linoleoylphosphatidylcholine Adding cholesterol to the lipid bilayer prepared above will most likely O decrease bilayer fluidity O increase bilayer fluidity have no effect on bilayer fluidity O destroy the bilayer
- When viewed by electron microscopy, the lipid bilayer is often described as looking like a railroad track. Explain how the structure of the bilayer creates this image.The composition of a cell membrane is not uniform for all types of cells.Some cell membranes are more rigid than others. Rigidity is determinedby a variety of factors, one of which is the structure of the carbon chains in the phospholipids that comprise the membrane. One example of aphospholipid was drawn, and another, having C–C double bonds in its carbon chains, is drawn here. Which phospholipid would be present in the more rigid cell membrane and why?Lipid bilayers are said to behave like two-dimensional fluids. What does this mean? What drives the movement of lipid molecules and proteins within the bilayer? How can such movement be measured? What factors affect the degree of membrane fluidity
- What chemical property characterizes the interior of the phospholipid bilayer? O hydrophilic O hydrophobic saturated O polarWhich of the following components of the cell membrane is found exclusively in the inner layer of the lipid bilayer? Ocholesterol O glycolipids O charged phospholipids O channels O receptorsIf you were tasked to make a very rigid lipid bilayer, which of the choices below would be the best choice? Trioleoylglycerol 1-myristoyl-2-lauroyl-phosphatidylserine Arachidic acid Distearoylphosphatidylcholine O N-oleoyl sphingomyelin