If a lipid raft is typically 70 nm in diameter and each lipid molecule has a diameter of 0.5 nm, about how many lipid molecules would there be in a lipid raft com- posed entirely of lipid? At a ratio of 50 lipid molecules per protein molecule (50% protein by mass), how many proteins would be in a typical raft? (Neglect the loss of lipid from the raft that would be required to accommodate the protein.)

Q: The activity of a pore-forming membrane protein, PorinA1, was tested in different lipid bilayers at…

A: Biological membranes are lipid bilayers, which provide structure to the cells. Biological membranes…

Q: From this structure, what is the predominant secondary structure of the protein? Based on what you…

A: Lindsay-Lang proposed the first protein structural hierarchy with four levels: Central, secondary,…

Q: Hyperthermophilic proteins are often stabilized by increasing the pressure. This means that when…

A: When a protein is formed it is a linear chain of various amino acids  linked together by various…

Q: inity of hemoglobin for oxygen varies according to the pH of the plasma. In fact, the warmer and…

A: The continuous link between hemoprotein oxygen saturation and oxygen tension is known as hemoglobin…

Q: a) List the constituents of phospholipids. b) Phospholipid molecules were suspended in a mixture…

A:

Q: The compositions of the inner and outer surfaces of the lipid bilayer are different. Why do these…

A: The lipid bilayer or phospholipid bilayer is a thin polar membrane made up of two layers of lipid…

Q: Protein X binds to molecule A. When [A] = 24.5 µmol L-1 at equilibrium, half of X is bound to A and…

A: Protein X binds to molecule A. When [A] = 24.5 µmol L-1 at equilibrium, half of X is bound to A and…

Q: A. We could look up the chemical composition of Actin to get exactly how many atoms it contains.…

A: Protein is a complex macromolecule of biological origin which functions in 3 dimensional space due…

Q: Sugars substitute water in many cells that may withstand extreme dehydration. These sugars interact…

A: It is given that sugars substitute water in many cells that may withstand extreme dehydration. These…

Q: Which of the following (could be more than one) would not be a rational explanation for why the…

A: A protein's three-dimensional structure, also known as its "3D structure" or "tertiary structure,"…

Q: 48. Aquaporins are located within the lipid bilayer of a cell's piasma membrane, which act as a…

A: NOTE: DISCLAIMER: Since you have asked multiple questions, we have solved the first question for…

Q: Uncharged molecules can passively pass through membranes more readily than charged molecules.…

A: An acid dissociation constant  (Ka) is a quantitative measure of the strength of an acid in the…

Q: A novel technique for determining the which lipids make up a pure homogenous lipid membrane has been…

A: The biological membrane is made up of lipids and proteins. Lipids play a wide variety of role in our…

Q: Describe the properties of three different types of lipid molecules. What are their respective…

A: Lipids, carbohydrates, proteins and nucleic acids are the major categories of the biomolecules.

Q: 3.4. A protein solution is prepared by dissolving 800 µg of protein in 200 µL of water. A 150 µL…

A: The four types of biological macromolecules are nucleic acids, proteins, lipids and carbohydrates.…

Q: You analyze a protein of 100 kDa using SDS-PAGE in the absence and presence of �-mercaptoethanol…

A: Multisubunit proteins are composed of more than 1 polypeptide chain.SDS (sodium dodecyl sulfate)…

Q: What are lipid rafts? Describe the molecular components

A: As per the honor code, we only answer one question at a time. Therefore we are answering the first…

Q: Lipoprotein particles (Figure 3.18) are spherical clusters of protein and lipid molecules that…

A: When it comes to transport molecules, lipoproteins are classified as composed of a mix of lipids and…

Q: Proteins are found to have two different types of secondary structures viz. a-helix and B-pleated…

A: The correct answer is (i) Hydrogen bonds. The alpha-helix structure of a protein is a type of…

Q: Describe the biological functions of lipids. What factorscan affect the transition temperature (Tm)…

A: Lipid is a biomolecule which is soluble only in nonpolar solvents. They are hydrocarbons which…

Q: Cholesterol ( above below ) has a fused four – ring core and is part of body membranes. The      -OH…

A: Membrane fluidity corresponds to the viscosity of a cell membrane's lipid bilayer. Lipid packaging…

Q: If the head group of a lipid has a surface area of , 65 A^2 ,estimate the number of lipid molecules…

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Q: Describe permeability of a phospholipid bilayer for the following molecules. Use terms:…

A: The plasma membrane of an animal cell is made up of a lipid bilayer with proteins impregnated on…

Q: Describe the structural and functional properties of lipid rafts

A: The plasma membrane of cells contain combinations of glycosphingolipids, cholesterol, and protein…

Q: direction of water flow across the membrane

A:

Q: A protein engineer was tasked to design a polypeptide chain that has an a-helical stretch that needs…

A: Alpha helix is a very common Secondary structure motif of protein in which NH group of peptide…

Q: Researchers investigating the protein composition in mice have identified a new protein and found…

A: Protein structure  The structure of proteins are made by condensation of amino acids through the…

Q: Physical methods are often used to determine protein conformation. Describe how x-ray…

A: Proteins- amino acids are the monomers for the production of proteins and contain nitrogen with…

Q: Mätch the following: At what level of protein structure do B-sheets of amino acids and a-helices,…

A: Proteins contain Carbon, Hydrogen, Oxygen and Nitrogen as the major components while Sulfur and…

Q: If a particular polypeptide that is very compact in 0.01 M NaCl expands considerably in 0.5 M NaCl,…

A: A polypeptide is defined as a linear chain of amino acids which are linked by peptide bonds. The…

Q: Glycophorin is an integral membrane protein found on the surface of red blood cells that is…

A: Glycophorin is a single pass total alpha-helical integral membrane protein. This protein plays an…

Q: Lipid bilayers are said to behave like two-dimensional fluids. What does this mean?

A: The lipid bilayer (or phospholipid bilayer) is a thin polar membrane made of two layers of lipid…

Q: Which of the following is true about the relative position of hydrophilic and hydrophobic amino…

A: Choice A is correct because the distribution of amino acids in globular proteins in the aqueous…

Q: How does the phospholipid bilayer of a liposome differ from the phospholipid bilayer of the plasma…

A: A phospholipid bilayer makes up the majority of cell membranes. This bilayer is made up of a…

Q: (i) Identify the type of sphingolipids A and B in Figure 2. CHS CH A CHS HO, в Figure 2 (ii) What…

A: Sphingolipids are a special type of lipids that have a sphingoid base and group of amino alcohols…

Q: In many cells that can survive severe dehydration, certain sugars replace water. These sugars…

A: In the cells during the severe dehydration, sugars that take the role of water are known as…

Q: Cholesterol has a fused four – ring core and is part of body membranes. The      -OH group on C-3 is…

A: Cholesterol is an inherent part of the cell membrane composition. The cell membrane is composed of…

Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.