What chemical property of phospholipids is key to the formation ofthe cell membrane?a. The positively charged nitrogen atomb. The covalent bond between the phosphate and the glycerolc. The kink in the fatty acid taild. The hydrophilic head and hydrophobic tails

What chemical property of phospholipids is key to the formation ofthe cell membrane?a. The positively charged nitrogen atomb. The covalent bond between the phosphate and the glycerolc. The kink in the fatty acid taild. The hydrophilic head and hydrophobic tails

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter3: Cell Structure And Function

Section: Chapter Questions

Problem 11RQ: The tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a....

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Question

What chemical property of phospholipids is key to the formation of
the cell membrane?
a. The positively charged nitrogen atom
b. The covalent bond between the phosphate and the glycerol
c. The kink in the fatty acid tail
d. The hydrophilic head and hydrophobic tails

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The tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a. phosphate groups; hydrophobic b. fatty acid groups; hydrophilic c. phosphate groups; hydrophilic d. fatty acid groups; hydrophobic
Which characteristic of a phospholipid contributes to thefluidity of the membrane?a. its headb. cholesterolc. a saturated fatty acid taild. double bonds in the fatty acid tail
Which of these is not a function of the lipid bilayer? A. Changes the temperature B. Provides a flexible matrix C. Imposes a barrier to permeability
_______are phospholipids with serine at coe that form rafts that float about within the membrane
A) Briefly describe the basic structure of phospholipids and explain how they can provide an effective barrier against the unregulated movement of molecules into or out of cells. B) Not all phospholipids are identical to one another. Describe two components (parts) of that can be altered to create variation between different phospholipids.
You make a phospholipid bilayer with short saturated hydro carbon tails. You measure the permeability of this membrane to oxygen and note it is very permeable. You then double the length of the hydro carbon tails, and remeasue membrane permeability. Would you predict that longer hydrocarbon tails increase of decrease permeability? Defend prediction
When a living cell, which has an outer membrane made of phospholipids, is placed in an aqueous (water) solution containing K+ and Na+ ions, one observes that these ions appear inside the cell. One would hypothesize that a) the phospho groups moved the ions through the Fatty Acids. b) the cell would swim away. c) H2O dissolved the membrane d) lipids had moved in and out of the cell through the water e) there must be a special mechanism moving the ions because of the properties of Fatty Acids.
Which of the following is not an extracellular matrix roleof carbohydrates?a. protect an insect’s internal organs from externaltraumab. prevent plant cells from lysing after the plant iswateredc. maintain the shape of a fungal spored. provide energy for muscle movement
Which of the following molecules is not capable of forming lipid bilayers? a. glycolipids b. wax esters c. phospholipids d. cerebrosides
A phospholipid ________.a. has both polar and nonpolar regionsb. is made up of a triglyceride bonded to aphosphate groupc. is a building block of ATPd. can donate both cations and anions in solution
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Which One is NOT TRUE about membranes? a. Membranes rich in fatty acids containing one or more double bonds are more fluid than membranes with no double bonds in fatty acids. b. If cholesterol is present in membranes, the fluidity of membranes will be reduced at moderate and warm temperatures. c. If cholesterol is present in membranes, the fluidity will remain intact at low temperatures. d. If the fatty acids with double bond are present in membranes, the membrane will be viscous.