3. You have a protein that is easily extracted from a cell membrane preparation, without any associated lipids, by washing with a buffer containing a salt (e.g. 2M NaBr) without the need to treat the membrane with detergents. What type of protein do you have? E) Peripheral (extrinsic) F) A protein covalently anchored to membrane fatty acids G) Transmembrane H) None of the above Answer: Explanation: 4. A bacterium is suddenly expelled from a warm human intestine into the cold world outside (hey, it's been a cold December!). Which of the following adjustments might the bacterium make to maintain the same level of membrane fluidity? 1) Produce lipids with hydrocarbon tails that are longer and have fewer double bonds J) Produce lipids with hydrocarbon tails that are shorter and have more double bonds K) Decrease the amount of cholesterol in the membrane L) Decrease the amount of glycolipids in the membrane Answer: Explanation: 5. Which of the following membrane lipids does not contain fatty acid tails? Explain what the biochemical nature of such lipid is. M) Phosphatidylcholine N) A glycolipid O) o) Phosphatidylserine P) Cholesterol Answer: Explanation: 6. Cholesterol serves several essential functions in mammalian cells. Which of the following properties of the membrane is not influenced by cholesterol? Q) Thickness R) Rigidity s) Fluidity T) Permeability Answer: Explanation:

In an experiment, a 0.001 (mole fraction) solution of polysaccharide in water is made and is placed in the compartment A.  Compartment B is filled with pure water.  The two compartments are separated by a porous semi-permeable membrane that allows the exchange of water molecules between the two compartments, but not that of the larger polysaccharide molecules.  part 1: Show that the chemical potential of water in compartment A is lower than that in compartment B by 2.48 J/mol.

Typically, our cells have a high concentration of sodium ions outside and a low concentration of sodium ions inside. Sodium ions continue to move out of the cell by the process of: a) secondary active transport b) pinocytosis c) facilitated diffusion d)simple diffusion e) primary active transport f) osmosis

4) Two membrane preparations have been made from the plasma membrane of erythrocytes (i.e red blood cells) and are being maintained in an isotonic buffer solution: (1) right-side-out membrane vesicles, in which the exoplasmic leaflet of the vesicle faces the buffer (equivalent in orientation to that of the exoplasmic leaflet of the intact plasma membrane); and (2) inside-out membrane vesicles in which the exoplasmic leaflet faces the interior of the vesicles and the cytoplasmic leaflet faces the buffer. 80 a. Right-side-out vesicles (ROVS) Very Low Fluorescence Inside-out vesicles (IOVS) Very High Fluorescence A newly discovered phosphoglyceride, called phosphotidylalanine is currently being studied. Annexin V is a protein that binds to phosphatidylalanine, which is one of the phospholipids present in the cell membrane preparations described above. Fluorescently labeled Annexin V is mixed with each vesicle preparation. The vesicles are washed to remove unbound Annexin V and then…

Please explain with detail

9. Recall that many cells have polarity (as in directionality, in this case). Consider the apical location of a particular protein (A) expressed in epithelial cells, illustrated in the figure above. Which type of defect described below is the most likely to cause the redistribution of that protein around the entire cell? A) A nonfunctional enzyme glycosylase. B) The deletion of a junctional protein. C) The truncation of a protein found in the extracellular matrix. D) A nonfunctional flippase. Answer: Explanation: apical plasma membrane lateral plasma membrane basal plasma membrane basal lamina protein A tight junction

The inner nuclear membrane contains a) None of these choices are accurate b) proteins including chaperonins and translocon c) integral membrane proteins including emerin, the lamin B receptor (LBR), and the SUN proteins d) peripheral membrane proteins including KASH and SUN

Which of the following statements is correct about diffusion? a) It is an active process in which molecules move from a region of lower concentration to one of higher concentration. It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration. c) it requires integral proteins d) It is a rapid process

An artificial cell consisting of an aqueous solution enclosed in a selectively permeable membrane (but with no cell wall) is immersed in a beaker containing an aqueous solution. The outside environment concentration consists of 0.01 M glucose and the inside of the cell has a concentration of 5.0 M glucose. The plasma membrane is permeable to water and monosaccharides, but impermeable to the disaccharides. Complete the following for the image below: Is the glucose going down or against its concentration gradient? Is the movement of the solute in the cell going out of the cell?       Down...Yes     Down...No     Against...Yes     Against...No

Please help me with this question. More than one answer may be correct.  Elastin _______. Options: A)  has a repeating structure of 3 amino acids such as Gly-Pro-X B)  crosslinks with numerous other elastin peptides to make an elastic fiber C)  is physically attached to the smooth endoplasmic reticulum D)  is physically attached to ribosomes E)  is rich in hydrophobic residues