Choose the Incorrect statement. In the phospholipid bilayer part of the cell membrane. None of the statement are false Cholesterol is one of the major constituents Zwitterionic phospholipid are approximately equally distributed between inner and outer monolayers Negatively charged phospholipids are located in the inner monolayer facing cytoplasm Glycosylated lipids are located in the outer monolayer facing other cells

Choose the Incorrect statement. In the phospholipid bilayer part of the cell membrane. None of the statement are false Cholesterol is one of the major constituents Zwitterionic phospholipid are approximately equally distributed between inner and outer monolayers Negatively charged phospholipids are located in the inner monolayer facing cytoplasm Glycosylated lipids are located in the outer monolayer facing other cells

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter3: Cell Structure

Section: Chapter Questions

Problem 8SQ: In a lipid bilayer, the of all the lipid molecules are sandwiched between all of the __________. a....

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Image analysis. The outer boundary of the cell is the plasma membrane.In the image below, molecules that cannot cross the membrane are glucose and ions.Why can't they cross the membrane? [MA] (c) (d) (a) Small uncharged molecules (b) Lipid-soluble Water-soluble substances lons substances Glucose Hydrocarbon Nat K+ H20 CO2 H+ cF Cat+ NH3 O They are hydrophobic O They are hydrophilic O large O Na, K, Ca and H ions will bind with phosphate Chloride ions will be repelled by phosphate they are small in size to
Cholesterol maintains the fluidity and stability of membranes at different temperatures. Cholesterol, therefore, ensures that the lipid bilayer Is always packed firmly Always has sugar molecules Is always moving Is destroyed
Two theories of membrane structure are discussed below. Unit Membrane Model Phospholipid molecules are the most abundant type of lipids in cell membranes. Each consists of a nonpolar, hydrophobic tail, and a polar, hydrophilic head. The phospholipid chains orient themselves to form a bilayer with the tails pointed inward and the hydrophilic heads lined up on both sides of the bilayer. An extended monomolecular layer of protein coats both the outside of the membrane and the inside of the bilayer, but the protein does not penetrate the bilayer. When thin slices of membranes were examined with an electron microscope, three layers were seen: two electron-dense layers, with one wider layer between them. It was believed that the electron-dense layers represented proteins, and the lighter area represented lipids. Fluid Mosaic Model The structure of the fluid mosaic membrane is a bilayer of phospholipid molecules with proteins inserted into the bilayer. Hydrophilic regions of both the lipids…
. Cholesterol is an integral part of plasma membranes. Based on its structure, where is it found in the membrane? On the extracellular surface embedded with the phospholipid heads within the tail bilayer attached to the intracellular surface
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
The plasma membrane has a hydrophobic interior due to the two present in each phospholipid found in the phospholipid bilayer of the cell membrane. The plasma membrane allows some molecules to cross but not all. Therefore, the plasma membrane is said to be Molecules that are nonpolar and hydrophobic will cross the membrane with ease by Does this process require energy? When molecules move across the plasma membrane by passive transport, they will move down or with the_ from an area of concentration to an area of. concentration. Polar, hydrophilic molecules and charged ions will move across the plasma membrane by the process of_ This does not require energy, but it does require a A special case of diffusion is known as which is the movement of water across the plasma membrane. If a cell is placed into a solution that is hypertonic compared to the inside of the cell, the cell would If a cell is placed into a hypotonic solution compared to the inside of the cell, the cell water. would…
TONICITY DRAG THE WORDS INTO THE BLANK SPACES BELOW TO ACCURATELY COMPLETE THE PARAGRAPH Hypotonic Osmosis water Swell Cell wall animal cell plant cell Facilitated Stay the same Hypertonic Diffusion Isotonic Shrink A Let's put both cells into Solution B. Because Solution B is hypertonic to the cytoplasms of the cells, we would expect water to the cells through the process of This would result in the cytoplasm of both cells shrinking. Now we'll put both the plant and the animal cell into Solution C, which, because it contains no solutes at all, is to the cytoplasm of both cells. will enter both cells through osmosis. The animal cell is likely to unfortunately. The plant cell, however, is protected from this because of the presence of its which is lacking in the animal cell.
Select the single best answer. The composition of a cell membrane is not uniform for all types of cells. Some cell membranes are more rigid than others. Rigidity is determined by a variety of factors, one of which is the structure of the carbon chains in the phospholipids that comprise the membrane. Two examples of phospholipids are shown below, with one having C-C double bonds in its carbon chains. Which phospholipid would be present in the more rigid cell membrane? CH2 Compound A: H-C- (CH3)9NCH,CH2-0-P-0-CH2 CH2-O Compound B: Н-с—о. (CHa)ÑCH,CH2-O-P-0-CH2 Compound A Compound B
phospholipid bilayer O protein 10 O cholesterol n protein cholesterol Using the diagram above, which component of this membrane contains a hydrophobic region and acts as the primary barrier to most foreign substances" carbohydrate chain carbohydrate chain Ophospholipid bilayer
Choose the TRUE statement. A phospholipid micelle (not a liposome) can be characterized as Forming a water in oil dispersion Having polar heads group-oriented inward AN aggregate forming below critical micellar concentration Having polar groups oriented outward. A spherical species featuring a double layer of phospholipid surrounding an aqueous compartment.
[Membrane Proteins] Based on the figure provided, What classification best describes G-proteins? Integral Membrane Proteins Peripheral Membrane Proteins Lipid-Anchored Proteins Soluble Cytosolic Proteins
In the cell membrane bilayer: most of the lipids have an inverted cone shape (headgroup region wider than the tail region on a lipid). 3 of these 4 responses are correct the hydrophobic lipid region is situated between the hydrophilic lipid regions. negatively-charged lipids are located mainly in the outer leaflet of the bilayer. O cholesterol always works to make membranes more fluid, regardless of the circumstances.