A critical feature of the plasma membrane is that it is selectively permeable. This allows the plasma membrane to regulate transport across cellular boundaries--a function essential to any cell's existence. How does phospholipid structure prevent certain molecules from crossing the plasma membrane freely?Drag the labels to fill in the table.can crosseasilyhave difficultycrossing thehydrophobicparttransportproteinrequired tocrossefficientlyReset Helpno transportproteinrequiredhydrophilichydrophobicType of moleculeNonpolar moleculesHydrophobic orAble to crossTransport proteinhydrophilic?lipid bilayer?required?(a)b©(examples: hydrocarbons, O2, CO₂)Group 1Group 3Group 2de(f)Polar molecules(examples: water, sugars)Group 1Group 3Group 29Ionsh(examples: Na+, K+, Ca 2+, CI")Group 1Group 3Group 2

Selective Permeability of the Plasma MembraneThe plasma membrane's selective permeability is a…

Answered: A critical feature of the plasma…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Facilitated diffusion differs from active transport in that facilitated diffusion transports against a concentration gradient while active transport does not facilitated diffusion requires expenditure of energy while active transport does not active transport requires expenditure of energy while facilitated diffusion does not facilitated diffusion involves carrier proteins while active transport does not facilitated diffusion works against a concentration gradient while active transport works only with the concentration gradient
Which of the following would render the plasma membrane more fluid? Group of answer choices Increased number of phospholipids with short fatty acid tails Decreased temperature Decreased number of cis-bonds Increased number of saturated phospholipid fatty acid tails
Membranes are effective barriers preventing the crossing of both polar and nonpolar molecules from one side to the other. Explain why it is difficult for any species to pass from one side of a membrane to the other, more specifically explain how membranes are able to keep polar molecules out of the cell, keep nonpolar molecules out of the cell and what region of the membrae the polar and nonpolar/ hydrophilic molecules will not like being assoicated with.
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
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.
Why do most molecules require the assistance of proteins to cross the cellular membrane? What factors limit diffusion of molecules across the cellular membrane?
The figure below illustrates a portion of a cell membrane. X denotes a membrane-spanning protein channel. Illustration of a partial cell membrane Which of the following is most likely true about the structure of X X A The upper and lower ends of X are hydrophilic and its middle is hydrophobic. C D The upper and lower ends of X, as well as its middle, are all hydrophobic. The upper and lower ends of X are hydrophobic and its middle is hydrophilic. The upper and lower ends of X, as well as its middle, are all hydrophilic.
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.
Which of the following type of protein would be most easily removed from a membrane by changing pH or ionic strength? peripheral protein integral protein all proteins are easily removed by changing pH or ionic strength lipid-anchored protein
Which of the following molecules can normally cross a phospholipid bilayer by simple diffusion? O Oxygen O Potassium ion (K+) O Methionine O Glucose
Drawn below is a schematic of a transmembrane protein. Extracellular Cell membrane Cytosolic side (a) From the list below, select the amino acid(s) that might by more common in the extracellular domain of this membrane protein and whose side- chain can form hydrogen bonds with the surrounding water molecules. Explain why you selected this option(s). Lysine Serine Phenylalanine Methionine (b) From the list below, select the amino acid(s) that would likely be found in the transmembrane/ membrane spanning domain of this protein and whose side- chain interacts with the lipid bilayer. Lysine Serine Phenylalanine Methionine
Eukaryotic 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 lipids

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