Plasma membrane phospholipid asymmetry: O is maintained when vesicles are endocytosed such that the outer leaflets of both structures have an identical composition. O requires the activity of scramblase. O is maintained by flippase. O relies on the spontaneous self-organization of lipid components. O is lost when vesicles are formed.
Q: Cholesterol-lipid microdomains are often referred to as membrane rafts.
A: True.
Q: The presence and orientation (direction) of integral glycoproteins indicates that the plasma…
A: The plasma membrane is also known as the Cell Membrane. It is a vital component of a cell that…
Q: Which of the following would you expect to be freely permeable through a pure lipid bilayer?…
A: lipid bilayer is a thin polar membrane that is made of two layers of lipid molecules. Lipid…
Q: If the distance between the two sides of the phospholipid bilayer were to decrease by 4-fold, what…
A: Answer: BACTERIAL CELL WALL IS MADE UP OF PHOSPHOLIPID BILAYER. There is an electrochemical…
Q: Secretory vesicles (destined for exocytosis) that fuse with the plasma membrane only in an…
A: Exocytosis is a process through which cells transports molecules (mostly polar) in bulk out of the…
Q: What features of a membrane are major contributors to its selectivepermeability?a. phospholipid…
A: The plasma membrane is the outer covering in the cells with no cell wall or any other outer covering…
Q: Although we tend to think of the cell membrane as a smooth covering for a cell, the membrane can…
A: Our cell membrane is made up of various elements. One such element is a fatty acid. Fatty acyl…
Q: Which of the following properties affect membrane fluidity? Phospholipid composition The number of…
A: Fats and fatty acids Fats are molecule or compound that contains fatty acids. Fatty acids on the…
Q: A plasma membrane consisting mostly of saturated phospholipids would be membrane consisting of…
A: Plasma membrane is the outer covering of cell which is responsible for movement of molecules inside…
Q: Although we tend to think of the cell membrane as a smooth covering for a cell, the membrane can…
A: The cell membrane is a bilayer of phospholipid. It contains lipids, proteins and also carbohydrates…
Q: Which two processes must be balanced (one process exactly equal to the other) in order to maintain a…
A: The cell membrane is the biological membrane that separates the interior of the cell from the…
Q: The spherical vesicles contain hydrolytic enzyme that can break down many kinds of biomolecules…
A: 1. Lysosomes : These are sphere shaped vesicles & contains hydrolytic enzyme that can break down…
Q: Of the following cell membrane lipids, which one prefers to reside in the INNER leaflet (or inner…
A: Phospholipids are lipid molecules constituting the cell membrane and are made up of two fatty acids…
Q: According to the fluid mosaic model, integral membrane proteins Select one: O A. none of the choices…
A: Cell membrane or plasma membrane is a dynamic, fluid structure which acts as a shield and channel…
Q: Arg in membrane proteins would most likely be found near the aqueous, extracellular environment in…
A: Aminoacids are of two types. Hydrophobic aminoacids have side chains that do not interact with…
Q: Which of the following correctly describes the structure of the phospholipid bilayer in plasma…
A: The plasma membrane is mostly made of phospholipids, which are fatty acids and alcohol. The…
Q: An advantage of membrane proteins is that they may be released from the membrane in a regulated…
A: Membrane proteins are a family of proteins that are found in biological membranes, whose primary…
Q: A phospholipid bilayer with equal amounts of saturated and unsaturated fatty acids displays a…
A: Introduction Lipids:- A lipid is any of various organic compounds that are insoluble in water. They…
Q: Which, among the following compounds, is a component of the plasma membrane? A Free fatty acids; B…
A: The plasma membrane is defined as the semipermeable membrane that surrounds the cell and, therefore,…
Q: Membrane proteins move laterally in a phospholipid bilayer but generally not up and down. Why would…
A: Membranes structure in eukaryotes is mostly consistent across cells and different organelles. It is…
Q: Please describe the hydrophobic effect and its contribution to membrane protein folding
A: The hydrophobic effect being the major driving force for the membrane protein folding
Q: A protein consists of one or more polypeptide chains. Each polypeptide chain is a polymer consisting…
A: Since there are multiple questions on this particular question, I will answer the first one for you.…
Q: exist almost exclusively on the exterior side, but not on the cytoplasmic side of th the glycolipids…
A: Lipids are not polymers. The simplest form of lipid is fatty acids which are a long chain of…
Q: Other cell membrane molecules include a compound called __________ , which functions to provide…
A: Every organism is either made up of a single cell or multiple cells. However, the basic unit of all…
Q: Membrane synthesis in the cell involves the movement of specific of phospholipids to the cytosolic…
A: The plasma membrane, or the cell membrane, separates the interior of the cell from the outside…
Q: Describe the structure of a biological membrane as proposed by the fluid mosaic model, Indicate the…
A: Biological membrane is important for a cell as it is selectively permeable and allows only few…
Q: About this figure of a transmembarne protein; one of the following is false? Thickness of nembrane o…
A: The proteins are made up of polypeptide chains of amino acids that can form several structural…
Q: A) What type of membrane protein is this? Integral, peripheral, monotopic, polytopic? How do you…
A: The cell membrane is a phospholipid bilayer structure that is dynamic and quasi-fluid. Into these…
Q: Explain the differences in the ease of lateral movement and bilayer translocation movement of…
A: Answer- There are basically two different types of movements that happen in the phospholipid…
Q: Which of the following statements are acceptable and why? [Whereas all the carbohydrate in the…
A: The cytomembrane, also known as the cell membrane, is found in all cells and serves to separate the…
Q: Exocytosis Exocytosis (below) is an active transport process in which a secretory vesicle fuses with…
A: 2.a The main purpose of exocytosis to expel the contents of the cell into extracellular fluid. the…
Q: A membrane consists of 50% protein by weight and 50% phosphoglycerides by weight. The average…
A: The cell membrane is a natural membrane that isolates the inside of all cells from the external…
Q: Which of the following molecules can normally cross a phospholipid bilayer by simple diffusion? O…
A: The transport process is defined as the movement of particles from one side of the cell membrane to…
Q: Eukaryotic membrane fluidity can be increased by which of the following mechanisms? increasing the…
A: The fluidity of the membrane refers to the viscosity of lipids bilayer. The fluidity of lipid…
Q: Proteins destined for which of the following destinations are transported through vesicles/the…
A: The endomembrane system consists of many membranes which are present in the cytoplasm in eukaryotic…
Q: he structure of a phosphoglyceride is shown below. Please do the following: Indicate which regions…
A: The biological plasma membrane has the main constituent of a phospholipid, which is known to form…
Q: Biological membranes are critical components of cells that allow compartmentalisation of cellular…
A: The diagram shows a schematic outline of a G protein coupled receptor or Seven Pass Receptor (since…
Q: Describe what gap junction are, emphasizing on how they are different two other cellular points of…
A: Cells are the basic structural and functional units of life. Cells form tissues. Tissues organize…
Q: Ion channels are formed by a particular kind of membrane protein that allows the passage of a…
A: The cell membrane is a structure which protects the cell and acts as a barrier and transports the…
Q: In the figure below, an integral membrane protein is shown. These proteins sit inside of cell…
A: Proteins are the linear polymers of amino acids that are attached together via peptide bonds. The…
Q: Eukaryotic membrane fluidity can be decreased by which of the following mechanisms? decreasing the…
A: The eukaryotic membrane is called the plasma membrane or cytoplasmic membrane. It separate the…
Q: None of the above Which of the following is amphipathic? O Phospholipids. O Integral proteins. O…
A: Introduction : Membrane lipids are amphipathic in nature. It has polar head and non polar tail.…
Q: Although we tend to think of the cell membrane as a smooth covering for a cell, the membrane can…
A: Fatty acyl chain is an even-numbered carbon chain. It contains hydrogen atoms along the length of…
Q: What non lipid macromolecules are inserted into the plasma membrane.
A: PLASMA MEMBRANE- Also known as Cytoplasmic membrane. Present below the cell wall and 7.5nm in…
Q: What is the role of cholesterol in the phospholipid bilayer shown? increases permeability of the…
A: Introduction: All cells are surrounded by a cell membrane, which is a flexible structure and…
Q: Early models of membrane structure viewed the plasma membrane as a sandwich of phospholipid bilayer…
A: The sandwich model of the cell membrane or Davson-Danielli's model of a phospholipid bilayer…
Q: Proteins bound within the inner membrane face of a vesicle will be _ after the vesicle merges with…
A: Vesicles and Vacuoles are the membrane bound sacs which performs the function of storage. Vesicles…
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
- Describe what gap junction are, emphasizing on how they are different two other cellular points of contact, their protein components and cellular function. Describe the three main sources of membrane fluidity. Describe in detail what proteoglycans are, including their hygroscopicity and biological roles.Which of the following is not a lipid link that anchors membrane-associated proteins to the bilayer? Thioether-linked prenyl anchors. Ester-linked triacylglycerol anchors. Glycosyl phosphatidylinositol anchors. Thioester-linked fatty acyl anchors. Amide-linked myristoyl anchors.Eukaryotic membrane fluidity can be increased by which of the following mechanisms? cell bio increasing the number of carbons in the fatty acids of membrane lipids increasing the number of fatty acids attached to glycerol in membrane lipids increasing the number of straight-chain fatty acids of membrane lipids increasing the degree of unsaturation in the fatty acids of membrane lipids increasing the number of membraned organelles in the eukaryotic cell
- DO NOT COPY THE ANSWER FROM THE SAME QUESTION. Sassa, a biology professor, wanted to demonstrate to her students the applicability of a dialyzing membrane (DM) as a model for the cell membrane by enclosing an aqueous solution in a DM bag and immersing in a beaker containing a different solution. Substances available which are permeable to the DM include 0.02 M NaCl, 0.03 M glucose, and 0.01 M glucose. The only substance available which is completely impermeable to the DM is the 0.01 M lactose. Using the substances given and materials such as a beaker, stirring rod, and string, draw ONLY ONE set-up that can be demonstrated by Ms. Sassa that will satisfy ALL of the following conditions:a. No solute will exhibit a net diffusion out of the cell.b. Glucose will exhibit a net diffusion into the cell.c. NaCl will exhibit a zero net d. No net movement of lactose from the inside to outside of the cell. Make sure to label properly the substance inside the beaker and inside the DM bag.Eukaryotic membrane fluidity can be decreased by which of the following mechanisms? decreasing the number of fatty acids attached to glycerol in membrane lipids increasing the number of carbons in the fatty acids of membrane lipids increasing the degree of unsaturation in the fatty acids of membrane lipids decreasing the number of membraned organelles in the eukaryotic cell increasing the number of branched-chain fatty acids of membrane lipidsMembrane synthesis in the cell involves the movement of specific of phospholipids to the cytosolic face or non-cytosolic face (also known as extracellular face) of the membrane to achieve their mature distribution. Which enzyme non-selectively moves phospholipids between the two faces of the lipid bilayer? convertases flippases phospholipases scramblases floppases
- Liposomes have long been investigated as drug delivery mechanisms in humans and animals, but only recently have they started to be used clinically in targeted cancer therapies and now, vaccines. Liposomes are simply vesicles with a phospholipid bilayer that contain an inner aqueous compartment. Hydrophilic compounds could be carried in the buffer inside the liposome or hydrophobic drugs within the membrane itself. For instance, the Moderna and Pfizer mRNA vaccines actually use liposome technology to deliver the SARS-CoV-2 spike mRNA to human cells. The liposomes fuse with the plasma membrane allowing the contents of the liposome to enter the cytosol of cells. Of course, once the mRNA is in the cytosol is can be translated to protein on a ribosome. Explain why nucleic acid won’t get through the plasma membrane on its own. Discuss the energetic restrictions to movement through the membraneEukaryotic 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 lipidsLipid raft formation: O relies on the spontaneous self-organization of lipid components. O leads to association of transmembrane proteins with relatively short TM domains. O excludes cholesterol and glycolipids. O induces patches of membrane to flip-flop and exchange components between leaflets. O includes lipids with short or unsaturated fatty acid tails.
- "Although lipid molecules are free to diffuse in the plane of the bilayer, they cannot flip-flop across the bilayer unless enzyme catalysts called phospholipid translocators are present in the membrane", is true or false.Match the following terms with the appropriate type of movement across a cell m diffusion active transport facilitated diffusion osmosis endocytosis A membrane-bound vesicle fuses with the cell membrane and releases its contents inside of the cell membrane lons move through a semi-permeable membrane down their concentration gradien t (high to low) without the use of energy from the cell. Water diffuses freely across a semi-permeable membrane without the use of energy from the cell. A molecule moves against its concentration gradient (low to high) with energy provided by ATP molecules in the cell A membrane-bound vesicle fuses with the cell membrane and releases its contents inside of the cell membrane A molecule moves down its concentration gradient (high to low) assisted by a carrier protein in the cell membrane without the use ofCells transporting substances across their membranes is essential. Choose TWO of the following types of cellular transport. ๏osmosis ๏active transport ๏facilitated diffusion ๏endocytosis / exocytosis (a)For each type of transport you choose, describe the transport process. Explain how the organization of cell membrane plays a role the movement of specific molecules across membrane. (b)Using the same transport types, identify a specific cell that utilizes that type of transit (i.e. one cell for each transport type, or two different cell examples), and detail a substance that is transferred. (c)A typical human lymphocyte has a radius of about 10 μm, while a typical bacterium (e.g., S. pneumoniae) has a radius of about 1 μm. Assuming that both cell types are perfectly spherical, compare and contrastthe transport mechanisms for each of these cells.