Which of the following statement is TRUE? Group of answer choices Sugars are added to glycolipids at the cytosolic side of cell membrane. An \alpha -helix containing 20 amino acids must be a transmembrane structure. Incorporation of cholesterol increases the fluidity of membrane. Phospholipids are synthesized on ER.
Added by Aitor S.
Step 1
** Show more…
Show all steps
Your feedback will help us improve your experience
Nicholas Mogoi and 62 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Text: Select all statements that are true regarding membrane lipids and proteins (may be more than one). 1) In the Golgi apparatus, the sugar moiety of a glycoprotein faces the noncytosolic side (lumen). 2) Sugar chains attached to membrane proteins and lipids always face the cytosolic side. 3) In the plasma membrane, the two leaflets have the same composition. 4) In the Golgi apparatus, the sugar moiety of a glycoprotein faces the cytosolic side. 5) Sugar chains attached to membrane proteins and lipids always face the cell surface.
Nicholas M.
Part I: Cellular membranes (structure and composition) Choose 10 1. Which of the following changes would you expect to increase the phase transition temperature (temperature at which it becomes more solid than fluid) of a synthetic bilayer composed of mostly of phosphatidylserine? A. Incorporation of phospholipids with longer fatty acid chains. B. Introduction of double bonds in the fatty acids. C. Addition of cholesterol. D. Incorporation of many sphingolipids. E. None of the above. 2. Which of the following lipids should be a scramblase substrate in the plasma membrane? A. Ganglioside GM1 B. Cholesterol C. Glycosylphosphatidylinositol D. Phosphatidylethanolamine E. Galactocerebroside 3. The plasma membrane serves many functions, many of which depend on the presence of specialized membrane proteins. Which of the following roles of the plasma membrane could still occur if the bilayer were lacking these proteins? (Which is an inherent function or property of the bilayer? A. intercellular communication B. selective permeability C. cellular movement D. import/export of molecules 4'. Which of the following membrane lipids does not contain a fatty acid tail? A. phosphatidylcholine B. a glycolipid C. phosphatidylserine D. cholesterol 6. Which of the following statements is true? A. Phospholipids will spontaneously form liposomes in nonpolar solvents. B. In eukaryotes, all membrane-enclosed organelles are surrounded by one lipid bilayer. C. Membrane lipids diffuse within the plane of the membrane. D. Membrane lipids frequently flip-flop between one monolayer and the other. 7. A bacterium is suddenly expelled from a warm human intestine into the cold world outside. Which of the following adjustments might the bacterium make to maintain the same level of membrane fluidity? A. Produce lipids with hydrocarbon tails that are longer and have fewer double bonds. B. Produce lipids with hydrocarbon tails that are shorter and have more double bonds. C. Decrease the amount of cholesterol in the membrane. D. Decrease the amount of glycolipids in the membrane. 8. Where does most new membrane synthesis take place in a eukaryotic cell? A. in the Golgi apparatus B. in the endoplasmic reticulum C. in the plasma membrane D. in the mitochondria E. on ribosomes
Adi S.
Which of the following is NOT true about the glycosylation of proteins? - Transmembrane proteins are often glycosylated. - Secreted proteins are often glycoproteins. - O-linked glycosylation occurs in the Golgi lumen. - Cytoplasmic proteins are often glycosylated. - N-linked glycosylation occurs in the ER lumen. A GPCR (G-protein coupled receptor) is situated in the plasma membrane with its amino-terminal on the extracellular side of the membrane and its carboxy-terminal on the cytosolic side of the membrane. The GPCR spans the membrane seven times. Which of the following is correct regarding the sequences of this protein that led to this orientation in the membrane? - It had a signal peptide located in the middle (removed). - It had an N-terminal signal peptide (retained). - It had the following sequences directing its membrane topology: N-terminal signal peptide (removed) - Stop - Start - Stop - Start - Stop - Start - Stop. Which of the following statements is true regarding the positioning of transmembrane proteins in the plasma membrane? - The luminal end is outside the cell (extracellular). - The cytosolic end is outside the cell (extracellular). - The cytosolic domain may flip to the luminal side of the membrane and end up outside the cell (extracellular).
Madhur L.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD