What is the effect of cholesterol when they are embedded in membranes? 1. Cholesterol alters the fluidity of membranes 2. Cholesterol makes membranes less porous 3. Cholesterol makes membranes more hydrophobic 4. Cholesterol makes membranes more spherical
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What is the effect of cholesterol when they are embedded in membranes?
1. Cholesterol alters the fluidity of membranes
2. Cholesterol makes membranes less porous
3. Cholesterol makes membranes more hydrophobic
4. Cholesterol makes membranes more spherical
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- How does cholestrol affect membrane fluidity? 1- it tends to increase the fluidity 2- it doesn't have any specific effect on fluidity 3- membranes doesn't have cholesterol 4- it tends to decrease the fluidityWhich of the following describes the function of cholesterols in plasma membranes to help regulate cell transport? Cholesterols are mainly responsible for cell signaling and cell recognition. Cholesterols act as fluidity buffer that make the membranes more fluid at higher B) temperatures and less fluid at lower temperatures. Cholesterols act as fluidity buffer that make the membranes less fluid at higher temperatures and more fluid at lower temperatures. Cholesterols in the phospholipid bilayer increase the membrane's permeability to ions and small molecules.How many of the following apply to fibrous proteins? I. Provide structural integrity and strength for many types of tissues. II. Transport and store oxygen and nutrients. III. Act as catalysts. IV. Are the main components of muscle, hair, and cartilage. V. Fight invasion of the body by foreign objects.
- A) how does a phospholipid differ from a fat? Why is this important for the cells lipid by layer? B) what is the difference between active and passive transport?What is the role of cholesterol in the cell membrane? It converts cis bonds of fatty acids to trans. It allows for the formation of micelle structures. It attracts to the polar phospholipid heads. It reduces membrane fluidity.Cholesterol is a needed substance for the human body; we use it as a base for certain hormones and as a support structure in our plasma membranes. If it is needed in the body,how can it also be harmful?
- What is the order of the molecules on the following list according to their ability to diffuse through a lipid bilayer, beginning with the one that crosses the bilayer most readily. 1. Ca²+ 2. CO₂ 3. Ethanol 4. Glucose 5. RNA 6. H₂O A. Ethanol, Glucose, CO₂, H₂O, RNA, Ca²+ B. CO₂, Ethanol, Glucose, H₂O, Ca²+, RNA C. RNA, Glucose, Ethanol, H₂O, CO₂, Ca²+ D. Ca²+, CO₂, H₂O, Ethanol, Glucose, RNA *Recall that RNA stands for ribonucleic acids, and acids are negatively charged molecules in solutionCholesterol is an integral part of plasma membranes. Based on its structure and characteristics, where is it found in the membrane? O on the extracellular surface Owithin the tail portion of the bilayer O attached to the intracellular surface O embedded with the phospholipid heads Previous Page Page 3 of 7Which answer correctly matches each lipid to the correct final purified fraction type? O phospholipid-filtrate, cholesterol supernatant Ophospholipid-residue, cholesterol filtrate Ophospholipid-precipitate, cholesterol- supernatant Ophospholipid-residue, cholesterol-precipitate
- Which of these general statements is TRUE about the lipid called phosphatidylethanolamine (or PE)? PE is zwitterionic at normal cell pH. PE is an aminophospholipid. 3 of these 4 responses are correct PE is a type of cholesterol. PE resides mainly in the inner leaflet of the membrane bilayer.Which of these general statements is TRUE about the lipid called phosphatidylethanolamine (or PE)? PE is NOT an aminophospholipid. 3 of these 4 responses are correct PE resides mainly in the outer leaflet of the membrane bilayer. PE is zwitterionic at normal cell pH. PE is a type of cholesterol.The Structural Component of the cell membrane Complete the sentence. 1. The fluidity of the cell membrane helps 2. Saturated fatty acids and unsaturated fatty acids 3. Cholesterol makes it possible for the cell membrane to