Which of the following statements is true about biomembrane? Membrane proteins and lipids are distributed symmetrically in the two leaflets of the bilayer. Lipid-linked proteins are anchored to the bilayer by the lipid moiety that covalently attached to the protein. Lipid molecules can diffuse laterally in each leaflet of the bilayer but they can never flip from one leaflet to another. The fluid mosaic model describes the dynamic arrangement and interaction of proteins but not lipids in membrane. Bilayers are formed by triacylglycerol, glycerophospholipids, and sphingolipids.

Which of the following statements is true about biomembrane? Membrane proteins and lipids are distributed symmetrically in the two leaflets of the bilayer. Lipid-linked proteins are anchored to the bilayer by the lipid moiety that covalently attached to the protein. Lipid molecules can diffuse laterally in each leaflet of the bilayer but they can never flip from one leaflet to another. The fluid mosaic model describes the dynamic arrangement and interaction of proteins but not lipids in membrane. Bilayers are formed by triacylglycerol, glycerophospholipids, and sphingolipids.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter5: Membranes And Transport

Section: Chapter Questions

Problem 1TYK: In the fluid mosaic model: plasma membrane proteins orient their hydrophilic sides toward the...

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Which of the following provides the most accurate description so far of a cell membrane? The cell membrane is composed of a pure lipid bilayer that is covered entirely by proteins. The cell membrane is composed purely of a lipid bilayer that formed from lipid molecules that have aggregated. The cell membrane is composed of a lipid bilayer with membrane proteins moving freely in the lipid bilayer. O The cell membrane is composed of globular proteins that are covered by the lipid bilayer.
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…
Which of the following best describes a biological membrane? two layers of phospholipids with proteins embedded between the two layers two layers of phospholipids (with opposite orientations of the phospholipids in each layer) with each layer covered on the outside with proteins two layers of phospholipids with proteins either spanning the layers or on the surface of the layers a fluid structure in which phospholipids and proteins move freely between sides of the membrane a mixture of covalently linked phospholipids and proteins that determines which solutes can cross the membrane and which cannot
Draw a lipid bilayer, and focus on three lipids that are on the same side of the membrane. Color in the areas where you expect the hydrophobic interactions, and in another color, shade in the areas that are hydrophilic. Draw another lipid bilayer, and for this one, include two membrane proteins. One of them should be an integral membrane protein and the other one a peripheral membrane protein. Label the lipid bilayer, the side the faces the cytoplasm and the side that faces outside the cell. Also label the two proteins, and shade in the areas where you predict that you would find hydrophobic amino acids and hydrophilic amino acids.
The fluid mosaic model of the membrane describes the membrane as: containing a significant quantity of water in the interior composed of fluid phospholipids on the outside and protein on the inside composed of proteins on the outside and phospholipids on the inside made of proteins embedded into a fluid phospholipid bilayer
Which of the following statements about a typical plasma membrane is correct? The hydrophilic interior of the membrane is composed primarily of the fatty acid tails of the phospholipids. Carbohydrates on the membrane surface are important in determing the overall bilayer structure. Phospholipids are the primary component that determines which solute can cross the plasma membrane. The two sides of the plasma membrane have different lipid and protein composition. The plasma membrane is covalently linked network of phospholipids and proteins that controls the movement of solutes into and out of a cell.
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.
Which of the following statement best describes the chemical composition of cytoplasmic membrane? Cytoplasmic membrane is bilayer of phospholipids embedded with proteins Cytoplasmic membrane is composed of two layers- one layer of phospholipids and one layer of proteins. Cytoplasmic membrane is bilayer of proteins embedded with phospholipids
Below are listed molecules with different chemical characteristics. Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the list that most accurately predicts the relative rates of diffusion of these molecules (fastest to slowest) across a biological membrane. alanine, propanol, sodium, estrogen sodium, propanol, alanine, estrogen estrogen, propanol, sodium, alanine estrogen, propanol, alanine, sodium
Draw and label a cell lipid bilayer and diagram how the following transport processes take place: passive diffusion of oxygen into the cell, facilitated diffusion of potassium into the cell, active transport of sucrose into the cell. Using different symbols (circles for oxygen, squares for sucrose, and triangles for potassium ions), show the relative concentrations (gradients) of these substances on the inside and outside of the cell. For example, to show that oxygen enters the cell by going “down” its gradient, you would draw more circles on the outside of the cell than inside the cell. Be sure to show and label membrane proteins when appropriate, and show the electric membrane potential using “+”s (pluses) on one side and “-”s (minuses) on the other side of the membrane. Also show the proton pump which uses ATP as a source of energy.
Eukaryotic membrane fluidity can be increased by which of the following mechanisms? increasing the number of fatty acids attached to glycerol in membrane lipids decreasing the number of branched chain fatty acids of membrane lipids decreasing the number of carbons in the fatty acids of membrane lipids decreasing the number of membraned organelles in the eukaryotic cell increasing the degree of saturation in the fatty acids of membrane lipids
Which of the following statements about the membrane bilayer is FALSE? ccarbohydrate moieties are found on the outer leaflet O glycerophospholipids can move from one layer to the other the composition of glycerophospholipids varies between inner and outer leaflets the outer layer is more negatively charged one side of the bilayer often has more of specific glycerophospholipid than the other layer

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		Membrane proteins and lipids are distributed symmetrically in the two leaflets of the bilayer.
		Lipid-linked proteins are anchored to the bilayer by the lipid moiety that covalently attached to the protein.
		Lipid molecules can diffuse laterally in each leaflet of the bilayer but they can never flip from one leaflet to another.
		The fluid mosaic model describes the dynamic arrangement and interaction of proteins but not lipids in membrane.
		Bilayers are formed by triacylglycerol, glycerophospholipids, and sphingolipids.