Membrane-associated proteins can be distinguished by the types of interactions they have with the lipid bilayer and their structural motifs. Match each statement to the category of membrane-associated protein it describes.
Homework Answers
| Membrane spanning alpha helix | Membrane spanning beta strands | Lipid anchored membrane protein | Peripheral membrane protein |
|
Composed of about 20 hydrophobic residues |
Amino acid pattern: non polar R group, polar R group (repeats) | Often contain a residue with covalently attached glycosyl phosphatidylinositol | Can usually be released from membrane by concentrated salt solutions. |
This is the correct sequence of the type of protein and the statement associated with the proteins.
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Membrane-associated proteins can be distinguished by the types of interactions they have with the lipid bilayer...
Match the following: Integral (intrinsic) membrane proteins Transmembrane protein Porins C-- Lipid-linked proteins Peri...
Match the following: Integral (intrinsic) membrane proteins Transmembrane protein Porins C-- Lipid-linked proteins Peripheral (extrinsic) proteins 1. Channel-forming proteins found in the outer membranes of bacteria, with a beta-barrel motif. 2. Proteins that are associated with membranes, but can be dissociated by relatively mild procedures. 3. Proteins that completely span the membrane. 4. A general class of proteins that are tightly bound to membranes by hydrophobic interactions. 5. Membrane-associated proteins that have covalently-bonded lipids.
discuss the functions of various lipid molecules. explain how a lipid bilayer forms, the functions that...
discuss the functions of various lipid molecules. explain how a lipid bilayer forms, the functions that it serves, and the variability in its structure Identify the different types of membrane proteins (integral, peripheral linked and associated) and how they associate with the lipid bilayer. identify the secondary structural features of proteins that allow them to associate with the lipid bilayer TE k Explain why a plot of velocity versus substrate concentration is curved. define reaction orders and their relationship to...
_____membranes proteins are associated with the bilayer through interactions with other membrane component on the surface...
_____membranes proteins are associated with the bilayer through interactions with other membrane component on the surface of the membrane. Net movement of particles from a region where they are more concentrated to a region where they are law concentrated is called Diffusion of water through a selectively permeable membrane down its own concentration gradient It called A solution with an equivalent concentration of water and hence the tame osmotic pressure as the fluid inside the cell is said to be...
Although lipid-linked proteins and peripheral membrane proteins both exist outside of the plane of the membrane,...
Although lipid-linked proteins and peripheral membrane proteins both exist outside of the plane of the membrane, one can be removed somewhat easily whereas removing the other requires disrupting the membrane. Which type of protein requires the membrane to be disrupted to isolate it? Explain your choice. (Describe the connection each protein has to the cell membrane and explain why the membrane must be disrupted to isolate one of the proteins.)
Ions, polar molecules, and large molecules cannot readily cross a lipid bilayer and are dependent on transport proteins to cross a membrane.
Ions, polar molecules, and large molecules cannot readily cross a lipid bilayer and are dependent on transport proteins to cross a membrane. Classify each of the seven images as an example of a uniport, symport, or antiport transport system.
1. The fatty acid tails of membrane lipids point inward into the lipid bilayer away from...
1. The fatty acid tails of membrane lipids point inward into the lipid bilayer away from the aqueous environment. a.) True b.) False 2. Proteins with only the amino acids D, E, K, and R on their surface can be found exclusively in the interior of a lipid bilayer. a.) True b.) False
A cell membrane consists of a lipid bilayer, which is a double layer of phospholipids. Each...
A cell membrane consists of a lipid bilayer, which is a double layer of phospholipids. Each phospholipid has a hydrophilic phosphate head and a hydrophobic lipid tail. These phospholipids are not chemically bound to one another, but rather maintain their structure due to the fact that the lipid tails do not like water. They're hydrophobic^2. If they all buddy up, then they can all stay dry. (See figure.) One way to deal with this quantitatively is to realize that there...
SDS-PAGE is often used to determine the location and orientation of membrane associated proteins. Commonly, experimental...
SDS-PAGE is often used to determine the location and orientation of membrane associated proteins. Commonly, experimental preparations of membranes are treated in a variety of ways in order to extract the proteins, which are then subjected to SDS-PAGE. These treatments will affect membrane proteins in different ways, based on how they are arranged in the membrane. One of the most common pre-treatments is by the digestive enzyme trypsin, which degrades polypeptide chains. Trypsin is too large to cross a membrane,...
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...
4. Create some drawings/models of membrane transport proteins. Blob models are fine but they should be...
4. Create some drawings/models of membrane transport proteins. Blob models are fine but they should be annotated as instructed below. In your drawing include a model for a lipid bilayer clearly showing the polar and non-polar nature of the lipid components. The models of the proteins should include annotation/shading or other indication that indicates the types of amino acid functional groups you might expect to see in (a) the exterior of the protein in contact with the lipid bilayer, (b)...
Match the following: Integral (intrinsic) membrane proteins Transmembrane protein Porins C-- Lipid-linked proteins Peripheral (extrinsic) proteins 1. Channel-forming proteins found in the outer membranes of bacteria, with a beta-barrel motif. 2. Proteins that are associated with membranes, but can be dissociated by relatively mild procedures. 3. Proteins that completely span the membrane. 4. A general class of proteins that are tightly bound to membranes by hydrophobic interactions. 5. Membrane-associated proteins that have covalently-bonded lipids.
discuss the functions of various lipid molecules. explain how a lipid bilayer forms, the functions that it serves, and the variability in its structure Identify the different types of membrane proteins (integral, peripheral linked and associated) and how they associate with the lipid bilayer. identify the secondary structural features of proteins that allow them to associate with the lipid bilayer TE k Explain why a plot of velocity versus substrate concentration is curved. define reaction orders and their relationship to...
_____membranes proteins are associated with the bilayer through interactions with other membrane component on the surface of the membrane. Net movement of particles from a region where they are more concentrated to a region where they are law concentrated is called Diffusion of water through a selectively permeable membrane down its own concentration gradient It called A solution with an equivalent concentration of water and hence the tame osmotic pressure as the fluid inside the cell is said to be...
Ions, polar molecules, and large molecules cannot readily cross a lipid bilayer and are dependent on transport proteins to cross a membrane. Classify each of the seven images as an example of a uniport, symport, or antiport transport system.
A cell membrane consists of a lipid bilayer, which is a double layer of phospholipids. Each phospholipid has a hydrophilic phosphate head and a hydrophobic lipid tail. These phospholipids are not chemically bound to one another, but rather maintain their structure due to the fact that the lipid tails do not like water. They're hydrophobic^2. If they all buddy up, then they can all stay dry. (See figure.) One way to deal with this quantitatively is to realize that there...
SDS-PAGE is often used to determine the location and orientation of membrane associated proteins. Commonly, experimental preparations of membranes are treated in a variety of ways in order to extract the proteins, which are then subjected to SDS-PAGE. These treatments will affect membrane proteins in different ways, based on how they are arranged in the membrane. One of the most common pre-treatments is by the digestive enzyme trypsin, which degrades polypeptide chains. Trypsin is too large to cross a membrane,...
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...
4. Create some drawings/models of membrane transport proteins. Blob models are fine but they should be annotated as instructed below. In your drawing include a model for a lipid bilayer clearly showing the polar and non-polar nature of the lipid components. The models of the proteins should include annotation/shading or other indication that indicates the types of amino acid functional groups you might expect to see in (a) the exterior of the protein in contact with the lipid bilayer, (b)...
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