Homework Answers
Transfusion diffusion is also known as flip-flop movement.
In this process, the lipid from one surface of the membrane moves
to another surface of the
membrane. Transfusion diffusion is a very slow and dynamic process
and requires
fairly less amount of energy.
Transfusion diffusion is also the most thermodynamically
unfavourable lipid activity.
Option D is the correct answer.
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Which of the following would be the most thermodynamically unfavorable membrane lipid activity in a membrane?...
What property of membranes makes the transverse diffusion of phospholipids across the membrane energetically unfavorable? a....
What property of membranes makes the transverse diffusion of phospholipids across the membrane energetically unfavorable? a. lateral diffusion Ob protein immobilization O c. hydrophobic interior of the membrane d. membrane fluidity
Which of the following statements are true? a. All membrane proteins are bound to the interior...
Which of the following statements are true? a. All membrane proteins are bound to the interior of the membrane. b. Both proteins and lipids undergo transverse diffusion from the inner to outer leaflets. c. Some proteins and lipids undergo lateral diffusion along the surface of the membrane. d. Carbohydrates are found covalently attached to molecules on the outside of the membrane. e. The term 'mosaic' describes a highly-ordered region of the membrane rich in cholesterol and sphingolipids.
Which of the following would produce the most fluid lipid bilayer? O phospholipids with tails of...
Which of the following would produce the most fluid lipid bilayer? O phospholipids with tails of 26 carbon atoms and two double bonds O phospholipids with fully saturated tails of 20 carbon atoms O large amounts of cholesterol O phospholipids with tails of 20 carbon atoms and two double bonds o phospholipids with fully saturated tails of 24 carbon atoms Which of the following can influence the rate at which a molecule will move across a lipid bilayer? (Check all...
Which of the following is NOT true of lipid rafts? The are less fluid than the...
Which of the following is NOT true of lipid rafts? The are less fluid than the surrounding membrane The can serve to localize components of reactions and pathways They contain a higher concentration of cholesterol than the surrounding membrane They contain a higher concentration of glycolipids than the surrounding membrane Lipid composition (i.e. the % of each type of lipid) of a membrane often differs (Select any/all that apply) OAt different locations in the cell (i.e. in different organelles) In...
1. Which of the following steps is thermodynamically unfavorable at all temperatures? (No looking up any...
1. Which of the following steps is thermodynamically unfavorable at all temperatures? (No looking up any tables.) . - cian -... 2.
Which of the following is NOT a property of membrane lipids Select one: a. The two...
Which of the following is NOT a property of membrane lipids Select one: a. The two leaflets of the plasma membrane have different lipid composition b. Most fatty acids attached to lipids have a length of 16 to 22 carbon atoms c. The plasma membrane is composed of a mixture of glycerolipids, sphingolipids and cholesterol. d. Phospholipids prefer to form micelles e. Cholesterol increases the order of fatty acid side chains
WINILIT OF the following statements is true about biological membranes? Integral membrane proteins are composed exclusively...
WINILIT OF the following statements is true about biological membranes? Integral membrane proteins are composed exclusively of alpha-helices Lipid bilayers are easily permeable to various ions Both proteins and lipids readily undergo transverse diffusion ("flip-flopping") from the inside to the outside leaflet of the membrane O Membrane lipids self-assemble via non-covalent interactions to form lipid bilayers O Polar head groups in membrane phospholipids are always negatively charged
Which of the below molecules would be expected to be membrane permeable and freely pass through a lipid bilayer? Select...
Which of the below molecules would be expected to be membrane
permeable and freely pass through a lipid bilayer?
Select all that apply
Which of the below molecules would be expected to be membrane permeable and freely pass through a lipid bilayer? Select all that apply. O=C=0 Nat NEN K+ * H-C-OH Ο Ι Ι HHHHHH
Question 24 Which of the following categories of membrane proteins is most likely to have restricted...
Question 24 Which of the following categories of membrane proteins is most likely to have restricted lateral mobility in a membrane? enzyme transporter O anchor O receptor all are restricted Question 5 New membrane synthesis occurs by spontaneous aggregation of free phospholipids into a new bilayer incorporation of phospholipids into one face of a preexisting membrane and their specific redistribution by enzymes like flippases incorporation of phospholipids into both faces of a preexisting membrane at the same time formation of...
Depletion of cholesterol in the cell membrane using a drug (mevastatin) has been associated with apoptosis in cancer cells. a. What effect would cholesterol depletion have on the integrity of lipid ra...
Depletion of cholesterol in the cell membrane using a drug (mevastatin) has been associated with apoptosis in cancer cells. a. What effect would cholesterol depletion have on the integrity of lipid rafts in the membrane? b. Researchers found that FAS death receptor was activated in cholesterol depleted cancer cells. Explain how activation of this receptor activates killer caspases. c. When a caspase is converted from its inactive to its active form there are changes in the primary and tertiary structure...
What property of membranes makes the transverse diffusion of phospholipids across the membrane energetically unfavorable? a. lateral diffusion Ob protein immobilization O c. hydrophobic interior of the membrane d. membrane fluidity
Which of the following would produce the most fluid lipid bilayer? O phospholipids with tails of 26 carbon atoms and two double bonds O phospholipids with fully saturated tails of 20 carbon atoms O large amounts of cholesterol O phospholipids with tails of 20 carbon atoms and two double bonds o phospholipids with fully saturated tails of 24 carbon atoms Which of the following can influence the rate at which a molecule will move across a lipid bilayer? (Check all...
Which of the following is NOT true of lipid rafts? The are less fluid than the surrounding membrane The can serve to localize components of reactions and pathways They contain a higher concentration of cholesterol than the surrounding membrane They contain a higher concentration of glycolipids than the surrounding membrane Lipid composition (i.e. the % of each type of lipid) of a membrane often differs (Select any/all that apply) OAt different locations in the cell (i.e. in different organelles) In...
1. Which of the following steps is thermodynamically unfavorable at all temperatures? (No looking up any tables.) . - cian -... 2.
WINILIT OF the following statements is true about biological membranes? Integral membrane proteins are composed exclusively of alpha-helices Lipid bilayers are easily permeable to various ions Both proteins and lipids readily undergo transverse diffusion ("flip-flopping") from the inside to the outside leaflet of the membrane O Membrane lipids self-assemble via non-covalent interactions to form lipid bilayers O Polar head groups in membrane phospholipids are always negatively charged
Which of the below molecules would be expected to be membrane
permeable and freely pass through a lipid bilayer?
Select all that apply
Which of the below molecules would be expected to be membrane permeable and freely pass through a lipid bilayer? Select all that apply. O=C=0 Nat NEN K+ * H-C-OH Ο Ι Ι HHHHHH
Question 24 Which of the following categories of membrane proteins is most likely to have restricted lateral mobility in a membrane? enzyme transporter O anchor O receptor all are restricted Question 5 New membrane synthesis occurs by spontaneous aggregation of free phospholipids into a new bilayer incorporation of phospholipids into one face of a preexisting membrane and their specific redistribution by enzymes like flippases incorporation of phospholipids into both faces of a preexisting membrane at the same time formation of...
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