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 How does the Unit Membrane Model differ from the Fluid Mosaic Model? O A. The location of proteins differs in the two models. OB. The Unit Membrane Model has a monomolecular layer of protein on each surface, while the Fluid Mosaic Model has a bimolecular layer of protein on each surface. O C. The Unit Membrane Model has one layer of phospholipids, while the Fluid Mosaic Model has two layers. O D. The Unit Membrane Model contains dissolved protein, while the Fluid Mosaic Model is coated with a monomolecular layer of protein on each surface.
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 How does the Unit Membrane Model differ from the Fluid Mosaic Model? O A. The location of proteins differs in the two models. OB. The Unit Membrane Model has a monomolecular layer of protein on each surface, while the Fluid Mosaic Model has a bimolecular layer of protein on each surface. O C. The Unit Membrane Model has one layer of phospholipids, while the Fluid Mosaic Model has two layers. O D. The Unit Membrane Model contains dissolved protein, while the Fluid Mosaic Model is coated with a monomolecular layer of protein on each surface.
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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