•Enzymesused to synthesize phospholipids on cytosolic surface of ER bilayer
•Enzymesused to synthesize phospholipids on cytosolic surface of ER bilayer
Homework Answers
flippases
phospholipid-handling enzyme that removes specific phospholipids from side of bilayer facing exterior space and flips them into the monolayer that faces the cytosol
- initiates and maintains asymmetric arrangement of phospholipids characteristic of membranes of animal cells- preserved as membranes bud from one organelle and fuse with another or with the plasma membrane, meaning all cell membranes have distinct 'inside' and 'outside' faces
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•Enzymesused to synthesize phospholipids on cytosolic surface of
ER bilayer
A membrane bilayer A has more unsaturated fatty acids in its phospholipids than membrane bilayer B....
A membrane bilayer A has more unsaturated fatty acids in its phospholipids than membrane bilayer B. Which of the following is correct? a) membrane bilayer A is more likely to gel at lower temperatures than membrane bilayer B b) membrane bilayer B is more likely to gel at lower temperatures than membrane bilayer A c) different membrane bilayer all gel at the same temperatures d) membrane bilayers do not gel
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...
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...
1. Lets compare two lipid bilayer systems: one composed of phospholipids having saturated acyl chains 20...
1. Lets compare two lipid bilayer systems: one composed of phospholipids having saturated acyl chains 20 carbons in length, and the other having acyl chains of the same length but with cis double bonds at C-5, C-8, C-11 and C-14. a. Lets assume that all of the head-groups are phosphatidylethanolamine. Draw a representative lipid from each bilayer system. b. Which lipid bilayer system will have the highest Tm? Explain.
If the lipid bilayer in Section B represents the ER membrane, which part of the protein...
If the lipid bilayer in Section B represents the ER membrane, which part of the protein is found INSIDE the ER (in the ER lumen)? A. COOH 26 oligosaccharides transmembrane a helix cause lipid bilayer B. LSH- C. -NH2 SH Figure 10-22. Molecular Biology of the Cell, 4th Edition O The entire protein must be inside the lumen of the ER. O All sections are equally likely to be in the ER lumen. Section B is inside the ER lumen....
CELL BIOLOGY Chapter 10 The function of a lipid bilayer How is the lipid bilayer formed...
CELL BIOLOGY Chapter 10 The function of a lipid bilayer How is the lipid bilayer formed Know the different types of phospholipids and any unique features and locations (if there are any) Know the overall structure of a phospholipid How does a lipid membrane stay fluid? How to lipid move in a membrane? Just as important, know the movement lipids are unable to do in the absence of flipase. Alberts.-.Molecular.Biology.Of.The.Cell.5th.Ed IS THE TEXT
1. What is NOT TRUE regarding a phospholipid bilayer? A. The two leaflets of the bilayer...
1. What is NOT TRUE regarding a phospholipid bilayer? A. The two leaflets of the bilayer are identical. B. It takes energy to flip one phospholipid from one side to the other C. In animal cells cholesterol is inserted into the bilayer D. The bilayer can contain more than one type of phospholipid. 2. New membrane is made and assembled in the ___ and delivered to the plasma membrane in vesicles derived from the _. A. Cytosol; ER B. Cytosol;...
Please answer as many as you can. Will rate!! Across 4. Type of protein that spans...
Please answer as many as you can. Will
rate!!
Across
4. Type of protein that spans the entire
membrane
5. One of the amino acid residues used to form
O-linked glycoproteins.
7. Newly synthesized phospholipids are
inserted into the _____ side of the smooth ER membrane.
8. Type of bond used to link membrane proteins
to a membrane lipid
10. One of the sugars that can be added to
phosphatidylinositol to make glycosylphosphatidylinosiol
12. Enzyme that joins fatty acids and...
which of the following are not enzymes involved in moving phospholipids from one leaflet to another...
which of the following are not enzymes involved in moving
phospholipids from one leaflet to another
12. Membrane dynamics Page: 396 Difficulty: 2-。Ans: C Which of the following are not enzymes involved in moving phospholipids from one leaflet to another A) Flippases that move phosphatidylethanolamine and phosphatidylserine B) Floppases that move phospholipids from the cytosolic leaflet to the extracellular leatiet C) Flip-floppases that allow phospholipids to move back and forth between the inner and outer leaflets D) Scramblases that allow...
Which protein modification does NOT take place in the ER lumen? A. Polyubiquitylation &nbs
Which protein modification does NOT take place in the ER lumen? A. Polyubiquitylation B. N-linked glycosylation C. Cysteine bridge formation D. chaperone-mediated folding E. GPI anchoring 2. Which of these Eukaryotic proteins is least likely to exhibit an ER import sequence during translation? A. Glutathione B. CFTR C. Protein disulfide isomerase D. Acetylcholine receptor E. Na+-K+-ATPase 3. Which function is NOT attributed correctly to either smooth ER (SER) or rough ER (RER)?...
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...
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...
1. Lets compare two lipid bilayer systems: one composed of phospholipids having saturated acyl chains 20 carbons in length, and the other having acyl chains of the same length but with cis double bonds at C-5, C-8, C-11 and C-14. a. Lets assume that all of the head-groups are phosphatidylethanolamine. Draw a representative lipid from each bilayer system. b. Which lipid bilayer system will have the highest Tm? Explain.
If the lipid bilayer in Section B represents the ER membrane, which part of the protein is found INSIDE the ER (in the ER lumen)? A. COOH 26 oligosaccharides transmembrane a helix cause lipid bilayer B. LSH- C. -NH2 SH Figure 10-22. Molecular Biology of the Cell, 4th Edition O The entire protein must be inside the lumen of the ER. O All sections are equally likely to be in the ER lumen. Section B is inside the ER lumen....
Please answer as many as you can. Will
rate!!
Across
4. Type of protein that spans the entire
membrane
5. One of the amino acid residues used to form
O-linked glycoproteins.
7. Newly synthesized phospholipids are
inserted into the _____ side of the smooth ER membrane.
8. Type of bond used to link membrane proteins
to a membrane lipid
10. One of the sugars that can be added to
phosphatidylinositol to make glycosylphosphatidylinosiol
12. Enzyme that joins fatty acids and...
which of the following are not enzymes involved in moving
phospholipids from one leaflet to another
12. Membrane dynamics Page: 396 Difficulty: 2-。Ans: C Which of the following are not enzymes involved in moving phospholipids from one leaflet to another A) Flippases that move phosphatidylethanolamine and phosphatidylserine B) Floppases that move phospholipids from the cytosolic leaflet to the extracellular leatiet C) Flip-floppases that allow phospholipids to move back and forth between the inner and outer leaflets D) Scramblases that allow...
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