Which of the following statements is true? Cholesterol tends to gel the liquid crystalline state of the phospholipid bilayer at higher temperatures. Cholesterol tends to liquefy the gel state of the phospholipid bilayer at lower temperatures. All molecules and ions may readily cross the biological membrane by simple

Which of the following statements is true? Cholesterol tends to gel the liquid crystalline state of the phospholipid bilayer at higher temperatures. Cholesterol tends to liquefy the gel state of the phospholipid bilayer at lower temperatures. All molecules and ions may readily cross the biological membrane by simple

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter4: Energy And Metabolism

Section: Chapter Questions

Problem 10SQ

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List the following compounds in order of increasing lipid bilayer permeability: RNA, Ca2+, glucose, ethanol, n2, water.
Which of the following statements are TRUE about the phospholipid bilayer? Select all that apply. Integral proteins have at least one part touching the inner 'tails' of the membrane. Peripheral proteins span the entire membrane. Cholesterol can be used to make the membrane more OR less fluid, depending on the temperature. Glycolipids and glycoproteins face the inside of the cell.
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?
Which of the following is true about phospholipid bilayers? The interior of the layer is highly hydrophilic. The hydrophobic tail faces the cell interior. The polar/hydrophilic tails face the cell interior and exterior. The polar/hydrophilic heads face the cell interior and exterior. The hydrophobic head faces the cell exterior.
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
Biological membranes are critical components of cells that allow compartmentalisation of cellular contents. The diagram shows a biological membrane comprised of a lipid bilayer with a single polypeptide integrated into the membrane and spanning the membrane seven times. What is the name of the specific type of lipid comprising the bilayer shown above? What properties about the heads and tails of these lipid structures force them to be arranged as they are in the lipid bilayer?
For 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.
Two theories of membrane structure are discussed below. Unit Membrane Model Phospholipid molecules are the most abundant type of lipids in cell membranes. Each consists of a nonpolar, hydrophobic tail, and a polar, hydrophilic head. The phospholipid chains orient themselves to form a bilayer with the tails pointed inward and the hydrophilic heads lined up on both sides of the bilayer. An extended monomolecular layer of protein coats both the outside of the membrane and the inside of the bilayer, but the protein does not penetrate the bilayer. When thin slices of membranes were examined with an electron microscope, three layers were seen: two electron-dense layers, with one wider layer between them. It was believed that the electron-dense layers represented proteins, and the lighter area represented lipids. Fluid Mosaic Model The structure of the fluid mosaic membrane is a bilayer of phospholipid molecules with proteins inserted into the bilayer. Hydrophilic regions of both the lipids…
According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids? They frequently flip-flop from one side of the membrane to the other. They have hydrophilic tails in the interior of the membrane. They can move laterally along the plane of the membrane. They are free to depart from the membrane and dissolve in the surrounding solution.
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 correctly describes the structure of the phospholipid bilayer in plasma membranes? The polar hydrophilic groups of each leaflet face outward, toward the aqueous environment on either side of the membrane. A The non-polar hydrophobic groups of each leaflet face inward, toward each other. The non-polar hydrophilic groups of each leaflet face outward, toward the aqueous environment on either side of the membrane. B The polar hydrophobic groups of each leaflet face inward, toward each other. The polar hydrophilic groups of each leaflet face inward, toward each each other. The non-polar hydrophobic groups of each leaflet face outward, toward the aqueous environment on either side of the membrane. The non-polar hydrophilic groups of each leaflet face inward, toward each each other. The polar hydrophobic groups of each leaflet face outward, toward the aqueous environment on either side of the membrane.
select the false statement regarding phospholipid bilayer membranes. phospholipid bilayer part of the biological membrane has to be highly fluid to support its biological function. One of the forces driving phospholipid aggregation are Vender Waals interaction. Aggregation of phospholipid molecules is favored by higher entropy of water molecules in the aggregated state. Fluidity of phospholipid membranes is lower with higher content of unsaturated fatty acids. Phospholipid membrane containing unnatural trans unsaturated fatty acid are more rigid.