Which statement is correct about the phospholipids in membranes? The polar heads face inward The non-polar tails face outward The non-polar tails are hydrophilic A bilayer forms with the heads facing outward and the tails facing inward

Which statement is correct about the phospholipids in membranes? The polar heads face inward The non-polar tails face outward The non-polar tails are hydrophilic A bilayer forms with the heads facing outward and the tails facing inward

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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Concept explainers

Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.

Question

Which statement is correct about the phospholipids in membranes?
The polar heads face inward
The non-polar tails face outward
The non-polar tails are hydrophilic
A bilayer forms with the heads facing outward and the tails facing
inward

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Cell membranes consist mainly of ________ and ________. a. lipids; carbohydrates b. phospholipids; proteins c. lipids; carbohydrates d. phospholipids; ECM
Cell membranes consist mainly of a _________. a. carbohydrate bilayer and proteins b. protein bilayer and phospholipids c. phospholipid bilayer and proteins
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
In a lipid bilayer, the of all the lipid molecules are sandwiched between all of the __________. a. hydrophilic tails; hydrophobic heads b. hydrophilic heads; hydrophilic tails c. hydrophobic tails; hydrophilic heads d. hydrophobic heads; hydrophilic tails
Which of the following molecules is not capable of forming lipid bilayers? a. glycolipids b. wax esters c. phospholipids d. cerebrosides
. Cholesterol is an integral part of plasma membranes.Based on its structure, where is it found in themembrane?a. on the extracellular surfaceb. embedded with the phospholipid headsc. within the tail bilayerd. attached to the intracellular surface
Which of the following is true about phospholipid bilayers?
Which of the following is true about phospholipid bilayers? The interior of the layer is highly hydrophilic. The hydrophobic tail faces the cell interior. The polar/hydrophilic tails face the cell interior and exterior. The polar/hydrophilic heads face the cell interior and exterior. The hydrophobic head faces the cell exterior.
It seems paradoxical that a lipid bilayer can be fluid yet asymmetrical. Explain.
Which portion of a phospholipid is found in the middle (the interior) of a membrane?
Which of the following is a true statement? Sphingolipids contain 2 hydrophobic, acyl chains Phospholipids contain 3 hydrophobic acyl chains Sphingolipids are completely no-polar, hydrophobic molecules The different types of phospholipids do not have different physical properties when in the membrane
When phospholipids are carefully mixed with water they are observed to exhibit which of the following properties? a) Spontaneous organization into stable structures within the water environment, b) Orientation of the Phosphate parts of the molecule away from fatty acid (non-polar) environment of a bilayer, c) Hydrophilic orientation of the ionic section of the phospholipid molecules to the polar portions of the water molecules, d) All are true, e) None are true.