What is the cause of the impermeability of plasma membranes to water-soluble molecules?  Group of answer choices   the nonpolar nature of water presence of phospholipid bilayer with a nonpolar/hydrophobic interior region presence of transmembrane proteins the presence of cellulose

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 is false? Integral membrane proteins cannot, in general, be extracted from a cell without disruption of the membranes. The portion of an integral membrane protein that traverses the membrane has, in general, hydrophobic amino acid residues on the surface and hydrophilic amino acid residues in the interior. Peripheral membrane proteins can often be extracted from a membrane surface using a buffer with a high [salt]. Proteins can be tethered to a membrane via a lipid prosthetic group. Unless attached to the cytoskeleton, membrane lipids diffuse about the membrane surface.

The cytoplasm of a certain cell is composed of a solution that is 98% water, 2% solutes. Consider the solution shown in the beaker in this picture: FOOE OOS Foor solution. [Select] Cytoplasm is 98% water, 2% solutes. The solution in the beaker would be considered when compared to [Select] The plasma membrane is impermeable to solutes. Beaker solution is 98% water, 2% solutes the cell. We would expect that the cell would [Select] if it was placed in the would account for whatever changes might occur to the volume of the cytoplasm of the cell when it is placed in the solution.

3)What is the second type of lipid that plays a major role in the plasma membrane? This lipid does not have polar and nonpolar regions (its not amphiphilic) but plays a critical role in membrane permeability. A)phospholipids b) steroid hormones c) Cholesterol 4)Which one of the following influences the rate at which diffusion can occur? Size of the concentration gradient Mass of the molecule Distance All of the above affect diffusion None of the above affect the diffusion rate

Identify whether each method of membrane transport is passive or active by dragging the label to the correct box

Order following for rate of diffusion through a synthetic lipid bilayer. Explain your order.   Cl-, N2, alanine, tRNA, ribose, H2O

Which of the following would not be able to pass through the plasma membrane without the help of transmembrane proteins.     K+     O2     anything with a charge or is polar     Two answer choices are correct.

What are the functional significance of the fluidity of a cell membrane?

Which of the following molecules may diffuse freely through a phospholipid bilayer? (select two answers) asparagine, an amino acid with a large, hydrophilic side chain alanine, an amino acid with a small, hydrophobic side-chain testosterone, a steroid hormone fructose, a monosaccharide molecular oxygen (O2)