Which of the following statements about lipids in membranes is FALSE? O Membrane curvature may be controlled by the size of head groups in lipids O Lipids can move laterally within a membrane leaflet O Liposomes are synthesized membrane structures used to study membranes in the laboratory Flexion is when the hydrophobic tails of lipids swing and cross each other O Lipids flip-flop from the inner leaflet to the outer leaflet spontaneously

Which of the following statements about lipids in membranes is FALSE? O Membrane curvature may be controlled by the size of head groups in lipids O Lipids can move laterally within a membrane leaflet O Liposomes are synthesized membrane structures used to study membranes in the laboratory Flexion is when the hydrophobic tails of lipids swing and cross each other O Lipids flip-flop from the inner leaflet to the outer leaflet spontaneously

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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A lipid bilayer was prepared from equal amounts of the following lipids: • 1-lauryl-2-palmitoylphosphatidylcholine • 1-myristoyl-2-linoleoylphosphatidylcholine Adding cholesterol to the lipid bilayer prepared above will most likely O decrease bilayer fluidity O increase bilayer fluidity have no effect on bilayer fluidity O destroy the bilayer
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 components of the cell membrane is found exclusively in the inner layer of the lipid bilayer? Ocholesterol O glycolipids O charged phospholipids O channels O receptors
What makes phospholipids good at forming cellular membranes? ○ Regions of aliphatic and hydrophilic atoms causing an internalization of phosphorous making a bilayer O The polar and non-polar regions create an amphipathic bilayer of phospholipids Covalent and ionic bonds between glycerols create a tight seal around the cell O The three saturated fatty tails in phospholipids create a semi solid like structure that maintains a cell's shape O The four ring structure of cholesterol serves as a scaffold for making hormones
Peripheral membrane proteins O may noncovalently interact with phospholipid heads O contain many hydrophobic amino acid residues if found on the cytosolic leaflet but contain hydrophilic residues if found on the extracellular leaflet O contain only alpha helical membrane spanning domains O have covalently attached lipid or fatty acid anchors All of the other are true
At temperatures that are much lower than a lipid bilayer's melting point, adding cholesterol will most likely the fluidity of the bilayer. O increase O maintain O decrease
Which of these can never cross the lipid bilayer without the help of a transporter or a channel? O CO2 O 02 O water O Na+ O all of the above can diffuse through the lipid bilayer without transporter proteins or channels
Which of the following components of the cell membrane is found exclusively in the outer layer of the lipid bilayer? O cholesterol O glycolipids O charged phospholipids O anchor proteins O enzymic proteins
Cholesterol is an integral part of plasma membranes. Based on its structure, where is it found in the membrane? O within the tail bilayer O on the extracellular surface O embedded with the phospholipid heads O attached to the intracellular surface
which is true of a phospholipid? O the fatty acid tails are hydrophilic and repel water O the fatty acid tails are hydrophobic and repel water O the entire phospholipid is hydrophilic and repels water O the glycerol heads are hydrophilic, and repcl water
Macromolecule What kinds of molecules may pass through the cell membrane without the help of transport proteins? O Large and hydrophobic O Small and hydrophobic O Large and hydrophilic O None of the above
What is the primary function of carbohydrates attached to the exterior of cell membranes? O recognition of cells channels through membrane keep the membrane fluid