Phospholipids Answers
phospholipids?
Q. how many fatty acids does a phospholipid have attached to it? water gets thru the phospholipid bilayer only because... a. its a small molecule b. its nonpolar c. its a large molecule d. its hydrophobic
Asked by Danielle L - Fri Oct 26 23:18:37 2007 - Biology - 4 Answers - Comments
A. 2 fatty acid chains probably a... water is polar, it obviously isnt hydrophobic and its not very large compared to other molecules
Answered by ansq - Fri Oct 26 23:25:56 2007
Q. how many fatty acids does a phospholipid have attached to it? water gets thru the phospholipid bilayer only because... a. its a small molecule b. its nonpolar c. its a large molecule d. its hydrophobic
Asked by Danielle L - Fri Oct 26 23:18:37 2007 - Biology - 4 Answers - Comments
A. 2 fatty acid chains probably a... water is polar, it obviously isnt hydrophobic and its not very large compared to other molecules
Answered by ansq - Fri Oct 26 23:25:56 2007
How come phospholipids rarely filp from one layer to the other in most membranes?
Q. Phospholipids can diffuse laterally in a membrane bilayer, but they rarely flip from one layer to the other in most membranes. why? and, if you can answer this too: cholesterol readily flips from one layer to another. why?
Asked by Bookworm - Wed Jan 23 22:07:58 2008 - Botany - 1 Answers - Comments
A. Think about the phopholipid bilayer. There is a huge polar gradient from the interior to the exterior. While it's possible for longitudinal flipping to occur, it's extremely energetically unfavorable. The energy incurred to overcome the polarity is quite high, instead phospholipids move around and flip laterally. It's a matter of kinetics and good ol' delta-G
Answered by RedBad M - Wed Jan 23 23:55:50 2008
Q. Phospholipids can diffuse laterally in a membrane bilayer, but they rarely flip from one layer to the other in most membranes. why? and, if you can answer this too: cholesterol readily flips from one layer to another. why?
Asked by Bookworm - Wed Jan 23 22:07:58 2008 - Botany - 1 Answers - Comments
A. Think about the phopholipid bilayer. There is a huge polar gradient from the interior to the exterior. While it's possible for longitudinal flipping to occur, it's extremely energetically unfavorable. The energy incurred to overcome the polarity is quite high, instead phospholipids move around and flip laterally. It's a matter of kinetics and good ol' delta-G
Answered by RedBad M - Wed Jan 23 23:55:50 2008
How does p H affect the phospholipids in plant cell membranes?
Q. Please help. I have an hour to finish this coursework.
Asked by Jazz F - Fri Jan 15 08:59:02 2010 - Biology - 1 Answers - Comments
A. All proteins work at a certain p H, when the p H deviates from the optimum the intrinsic proteins in the phospholipid bi-layer denature and fall out. Allowing the cytoplasm to move into the surrounding environment.
Answered by C - Fri Jan 15 10:38:40 2010
Q. Please help. I have an hour to finish this coursework.
Asked by Jazz F - Fri Jan 15 08:59:02 2010 - Biology - 1 Answers - Comments
A. All proteins work at a certain p H, when the p H deviates from the optimum the intrinsic proteins in the phospholipid bi-layer denature and fall out. Allowing the cytoplasm to move into the surrounding environment.
Answered by C - Fri Jan 15 10:38:40 2010
Semipermeable cell membranes are made of phospholipids that form a bilayer.?
Q. Semipermeable cell membranes are made of phospholipids that form a bilayer. What major benefit does this arrangement of the membrane provide to the cell? Both surfaces of the membrane can interact with water and other molecules. Both surfaces of the membrane are nonpermeable. The cell has a greater level of structural support. The cell is able to easily change size and shape.
Asked by - Sat Oct 29 00:18:46 2011 - Biology - 3 Answers - Comments
A. Both surfaces of the membrane can interact with water and other molecules. That is why there is proteins in the membrane to allow passage and the polar ends and nonpolar middle allows it to selectively allow only certain molecules through, such as water and small non polar molecules The other guy is wrong, the cell membrane isn't fluid... thats the cytoplasm.
Answered by Kylie - Sat Oct 29 00:37:35 2011
Q. Semipermeable cell membranes are made of phospholipids that form a bilayer. What major benefit does this arrangement of the membrane provide to the cell? Both surfaces of the membrane can interact with water and other molecules. Both surfaces of the membrane are nonpermeable. The cell has a greater level of structural support. The cell is able to easily change size and shape.
Asked by - Sat Oct 29 00:18:46 2011 - Biology - 3 Answers - Comments
A. Both surfaces of the membrane can interact with water and other molecules. That is why there is proteins in the membrane to allow passage and the polar ends and nonpolar middle allows it to selectively allow only certain molecules through, such as water and small non polar molecules The other guy is wrong, the cell membrane isn't fluid... thats the cytoplasm.
Answered by Kylie - Sat Oct 29 00:37:35 2011
How Can Acetone dissolve Phospholipids?
Q. Since it is a polar solvent, how can it dissolve the hydrophobic Phospholipids? Does it become non-polar when mixed with water? I definetly know its not because their is a Polar region on the Phospholipids.
Asked by Dina - Sat Oct 17 14:20:57 2009 - Botany - 1 Answers - Comments
A. the lipid part is hydrophobic, but the phospho- part is polar
Answered by - Sat Oct 17 14:24:21 2009
Q. Since it is a polar solvent, how can it dissolve the hydrophobic Phospholipids? Does it become non-polar when mixed with water? I definetly know its not because their is a Polar region on the Phospholipids.
Asked by Dina - Sat Oct 17 14:20:57 2009 - Botany - 1 Answers - Comments
A. the lipid part is hydrophobic, but the phospho- part is polar
Answered by - Sat Oct 17 14:24:21 2009
Describe how Phospholipids assemble spontaneously to form the basic membrane?
Q. Describe how Phospholipids assemble spontaneously to form the basic membrane?
Asked by xTr3ndS3ttax - Thu Apr 2 19:44:39 2009 - Biology - 2 Answers - Comments
A. it has to do with the presence of water i think... one end is hydrophobic, the other hydophilic. so the hydrophillic end points out, and the phobic end points in, causing a phospholipid bilayer (b/c 2 rows group together)
Answered by LynxBahizi - Thu Apr 2 19:57:30 2009
Q. Describe how Phospholipids assemble spontaneously to form the basic membrane?
Asked by xTr3ndS3ttax - Thu Apr 2 19:44:39 2009 - Biology - 2 Answers - Comments
A. it has to do with the presence of water i think... one end is hydrophobic, the other hydophilic. so the hydrophillic end points out, and the phobic end points in, causing a phospholipid bilayer (b/c 2 rows group together)
Answered by LynxBahizi - Thu Apr 2 19:57:30 2009
Why do you think it takes so many steps for Phospholipids to be absorbed and passed in our body?
Q. Usually the more the steps you have, the greater the likelihood that something might go wrong. Do you have any thoughts as to why this process seems to be such a long process?
Asked by sweetcandie143637 - Wed Apr 29 21:51:57 2009 - Biology - 1 Answers - Comments
A. i'm not all that good in biology, but may i make a suggestion. the process of evolution requires that, generally, each step in the process was useful at some point in our evolutionary past. once a process works, there generally is not impetus to change it -- to optimize it, as it were. now there will be exceptions to that, if a process is sufficiently resource intensive. if there is a DNA change that makes the process "less expensive" (is use less energy) for the body, then, is food is in short supply, there will be a selection in the direction of the process that is more efficient. for that to happen, then the process in question will need to be a significant part of the organism's energy usage. lacking all that, "stuff… [cont.]
Answered by linlyons - Wed Apr 29 22:21:42 2009
Q. Usually the more the steps you have, the greater the likelihood that something might go wrong. Do you have any thoughts as to why this process seems to be such a long process?
Asked by sweetcandie143637 - Wed Apr 29 21:51:57 2009 - Biology - 1 Answers - Comments
A. i'm not all that good in biology, but may i make a suggestion. the process of evolution requires that, generally, each step in the process was useful at some point in our evolutionary past. once a process works, there generally is not impetus to change it -- to optimize it, as it were. now there will be exceptions to that, if a process is sufficiently resource intensive. if there is a DNA change that makes the process "less expensive" (is use less energy) for the body, then, is food is in short supply, there will be a selection in the direction of the process that is more efficient. for that to happen, then the process in question will need to be a significant part of the organism's energy usage. lacking all that, "stuff… [cont.]
Answered by linlyons - Wed Apr 29 22:21:42 2009
Why is a single layer of phospholipids better than a bi-layer one?
Q. The cells of a plant seeds store oils in the form of droplets enclosed by membranes. Unlike the membranes of the endomembraneous system, the oil droplet membrane consists of a single layer of phospholipids rather than a bi-layer. Explain Why this arrangement is more stable than a bi-layer arrangement. I need to write a paper on this and can't seem to find any information on them. Please, if you find a source or know of one, please send me the link. Thank You!
Asked by - Fri Nov 5 14:34:57 2010 - Biology - 1 Answers - Comments
A. Hi. You can go to wikipedia and see the difference between Micelles and Liposomes: Because micelles are single layered phospholipid membranes they can enclose hydrophobic molecules such as oils. Liposomes are phospholipid bi-layers and the inside of them is an aqueous environment so it can contain hydrophilic molecules. A liposome could only contain oils between the two phospholipid layers, and not in the center of the liposome. That's why micelles are better for oils, they can contain oils in their center.
Answered by JO - Fri Nov 5 15:03:13 2010
Q. The cells of a plant seeds store oils in the form of droplets enclosed by membranes. Unlike the membranes of the endomembraneous system, the oil droplet membrane consists of a single layer of phospholipids rather than a bi-layer. Explain Why this arrangement is more stable than a bi-layer arrangement. I need to write a paper on this and can't seem to find any information on them. Please, if you find a source or know of one, please send me the link. Thank You!
Asked by - Fri Nov 5 14:34:57 2010 - Biology - 1 Answers - Comments
A. Hi. You can go to wikipedia and see the difference between Micelles and Liposomes: Because micelles are single layered phospholipid membranes they can enclose hydrophobic molecules such as oils. Liposomes are phospholipid bi-layers and the inside of them is an aqueous environment so it can contain hydrophilic molecules. A liposome could only contain oils between the two phospholipid layers, and not in the center of the liposome. That's why micelles are better for oils, they can contain oils in their center.
Answered by JO - Fri Nov 5 15:03:13 2010
How the properties of phospholipids help to maintain the structure of the cell memrane???
Q.
Asked by - Wed Dec 9 14:41:02 2009 - Biology - 1 Answers - Comments
A. Because the cell membrane has a BI-layer of phospholipids, meaning that there is 2 layers of phospholipids head and tails. The 'head' of the phospholipid, glycerol, is hydrophilic, meaning that it is attracted to water molecules, whilst the 'tail' of the phospholipid, which are fatty acids hydrocarbons, is hydrophobic, it means that is 'repulses', is not attracted to, water. Therefore these properties make the phopholipds layer very stable into what we call a 'fluid mosaic' model. If you google fluid mosaic model cell membrane you will see the structure of the cell membrane. xxx
Answered by Kyll - Wed Dec 9 14:57:44 2009
Q.
Asked by - Wed Dec 9 14:41:02 2009 - Biology - 1 Answers - Comments
A. Because the cell membrane has a BI-layer of phospholipids, meaning that there is 2 layers of phospholipids head and tails. The 'head' of the phospholipid, glycerol, is hydrophilic, meaning that it is attracted to water molecules, whilst the 'tail' of the phospholipid, which are fatty acids hydrocarbons, is hydrophobic, it means that is 'repulses', is not attracted to, water. Therefore these properties make the phopholipds layer very stable into what we call a 'fluid mosaic' model. If you google fluid mosaic model cell membrane you will see the structure of the cell membrane. xxx
Answered by Kyll - Wed Dec 9 14:57:44 2009
What do the phospholipids do to form the cell membrane?
Q. Science project, wondering about phosphorus, phosphates, and phospholipids. Tell me everything you know about the elements and its products. :)
Asked by - Sun Mar 7 19:30:11 2010 - Biology - 2 Answers - Comments
A. Natural bilayers are usually made mostly of phospholipids, which have a hydrophilic head and two hydrophobic tails. When phospholipids are exposed to water, they arrange themselves into a two-layered sheet (a bilayer) with all of their tails pointing toward the center of the sheet. The center of this bilayer contains almost no water and also excludes molecules like sugars or salts that dissolve in water but not in oil. This assembly process is similar to the coalescing of oil droplets in water and is driven by the same force, called the hydrophobic effect. Because lipid bilayers are quite fragile and are so thin that they are invisible in a traditional microscope, bilayers are very challenging to study. Experiments on bilayers often… [cont.]
Answered by eli - Sun Mar 7 19:46:43 2010
Q. Science project, wondering about phosphorus, phosphates, and phospholipids. Tell me everything you know about the elements and its products. :)
Asked by - Sun Mar 7 19:30:11 2010 - Biology - 2 Answers - Comments
A. Natural bilayers are usually made mostly of phospholipids, which have a hydrophilic head and two hydrophobic tails. When phospholipids are exposed to water, they arrange themselves into a two-layered sheet (a bilayer) with all of their tails pointing toward the center of the sheet. The center of this bilayer contains almost no water and also excludes molecules like sugars or salts that dissolve in water but not in oil. This assembly process is similar to the coalescing of oil droplets in water and is driven by the same force, called the hydrophobic effect. Because lipid bilayers are quite fragile and are so thin that they are invisible in a traditional microscope, bilayers are very challenging to study. Experiments on bilayers often… [cont.]
Answered by eli - Sun Mar 7 19:46:43 2010
How would Phospholipids be distributed in a flask of water?
Q. I know that the hydrophilic head would point out and the hydrophobic tail would point in to form chains, rings etc. But here is the question- TO completely fill a sealerd 500 ml glass container that contains 490 ml distilled water you inject 10 ml of phospholipids. You shake this mixture vigourously and hten let it settle for an hour. Draw a diagram to show how the phospholipids would be distributed in the container.
Asked by JE - Fri Sep 4 08:21:56 2009 - Biology - 1 Answers - Comments
A. In order to make sure that the hydrophobic tails are away from water and hydrophilic heads are in it they form a phospholipid bilayer. Which is literally a circle inside a circle each made of phospholipid heads. The tails would be in between the two circles, and are able to move from side to side. This is what happens in cell membranes. This is how they would be distributed in the container. For a visual example search phospholipid bilayer on google, will make much more sense.
Answered by Dannystaples - Fri Sep 4 10:36:36 2009
Q. I know that the hydrophilic head would point out and the hydrophobic tail would point in to form chains, rings etc. But here is the question- TO completely fill a sealerd 500 ml glass container that contains 490 ml distilled water you inject 10 ml of phospholipids. You shake this mixture vigourously and hten let it settle for an hour. Draw a diagram to show how the phospholipids would be distributed in the container.
Asked by JE - Fri Sep 4 08:21:56 2009 - Biology - 1 Answers - Comments
A. In order to make sure that the hydrophobic tails are away from water and hydrophilic heads are in it they form a phospholipid bilayer. Which is literally a circle inside a circle each made of phospholipid heads. The tails would be in between the two circles, and are able to move from side to side. This is what happens in cell membranes. This is how they would be distributed in the container. For a visual example search phospholipid bilayer on google, will make much more sense.
Answered by Dannystaples - Fri Sep 4 10:36:36 2009
What are the structural differences between phospholipids and triglycerides?
Q. This is a Cell and Molecular biology class. I need as much detail as possible please. Thank you.
Asked by .::Ali G::. - Wed Jan 25 20:38:25 2006 - Biology - 2 Answers - Comments
A. Trigylcerides are composed of two types of molecules: glycerol and 3 fatty acids. Phospholipids are similar to triglycerides in that they contain glycerol and fatty acids, too. But, the big difference is that phospholipids are made up of 1 glycerol molecule and only 2 fatty acid molecules (not 3!) This is a big difference because in place of the third fatty acid, phospholipids have a polar group attached to the glycerol molecule. Remember, triglycerides were entirely hydrophobic because all three positions on the glycerol molecule were taken up by nonpolar fatty acids. But, phospholipids have a polar group in one place on the glycerol molecule, making phospholipids partly hydrophilic; the polar group helps to form the polar head. The two… [cont.]
Answered by opite - Wed Jan 25 20:57:20 2006
Q. This is a Cell and Molecular biology class. I need as much detail as possible please. Thank you.
Asked by .::Ali G::. - Wed Jan 25 20:38:25 2006 - Biology - 2 Answers - Comments
A. Trigylcerides are composed of two types of molecules: glycerol and 3 fatty acids. Phospholipids are similar to triglycerides in that they contain glycerol and fatty acids, too. But, the big difference is that phospholipids are made up of 1 glycerol molecule and only 2 fatty acid molecules (not 3!) This is a big difference because in place of the third fatty acid, phospholipids have a polar group attached to the glycerol molecule. Remember, triglycerides were entirely hydrophobic because all three positions on the glycerol molecule were taken up by nonpolar fatty acids. But, phospholipids have a polar group in one place on the glycerol molecule, making phospholipids partly hydrophilic; the polar group helps to form the polar head. The two… [cont.]
Answered by opite - Wed Jan 25 20:57:20 2006
this is a biology question for my homework and i need help, okay so what lets phospholipids move free?
Q. Phospholipids can move___and allow water an other___molecules to pass through into or out of the cell.
Asked by Kenia R - Sat Feb 6 16:30:10 2010 - Biology - 3 Answers - Comments
A. i think ive done this question--- The Cell membrane is also called the (Cytomembrane) and is made of a phospholipid (bilayer). The phospholipids have a hydrophilic [water attracting] (head) and two hydrophobic [water repellig] (tail). The head of a phospholipid is made of an alcohol and (phosphate) group, while the tails are chains of (fatty acids). This is your part Phospholipds can move out and allow water & other (water soluble) molecules to pass through into or out of the cell. This is known as simple (diffusion) because it does not require (ATP) and the water or molecules are moving (along) the concentration gradient. please vote best
Answered by (>^.^)> - Sat Feb 6 16:37:52 2010
Q. Phospholipids can move___and allow water an other___molecules to pass through into or out of the cell.
Asked by Kenia R - Sat Feb 6 16:30:10 2010 - Biology - 3 Answers - Comments
A. i think ive done this question--- The Cell membrane is also called the (Cytomembrane) and is made of a phospholipid (bilayer). The phospholipids have a hydrophilic [water attracting] (head) and two hydrophobic [water repellig] (tail). The head of a phospholipid is made of an alcohol and (phosphate) group, while the tails are chains of (fatty acids). This is your part Phospholipds can move out and allow water & other (water soluble) molecules to pass through into or out of the cell. This is known as simple (diffusion) because it does not require (ATP) and the water or molecules are moving (along) the concentration gradient. please vote best
Answered by (>^.^)> - Sat Feb 6 16:37:52 2010
Are phospholipids and cholesterol the only membrane forming lipids?
Q. Are there other types of steroids (besides cholesterol) that are found in membranes? I know that phospholipids and cholesterol are found in them for sure.
Asked by Kb - Sat Oct 3 15:29:45 2009 - Biology - 1 Answers - Comments
A. Yes. Other organisms besides animals have other steroid-like lipids in their cell membrane, ex. hopanoids in bacteria. There are also other kinds of chain lipids such as sphingolipids.
Answered by Weise Ente - Sat Oct 3 15:34:50 2009
Q. Are there other types of steroids (besides cholesterol) that are found in membranes? I know that phospholipids and cholesterol are found in them for sure.
Asked by Kb - Sat Oct 3 15:29:45 2009 - Biology - 1 Answers - Comments
A. Yes. Other organisms besides animals have other steroid-like lipids in their cell membrane, ex. hopanoids in bacteria. There are also other kinds of chain lipids such as sphingolipids.
Answered by Weise Ente - Sat Oct 3 15:34:50 2009
Would phospholipids need to form a bilayer?
Q. Would phospholipids need to form a bilayer if they were carefully poured onto the surface of water rather than being mixed up into the water? Why or why not?
Asked by mac - Mon Oct 5 02:19:50 2009 - Biology - 2 Answers - 1 Comments
A. Yes, phospholipids form bilayers spontaneously in the presence of water because Phospholipids have a hydrophilic(water loving) head and 2 hydrophobic(water hating) tails. Bilayers allow the tails to be away from the water while the heads are in contact with water.
Answered by x-Gay Boy-x - Mon Oct 5 02:26:53 2009
Q. Would phospholipids need to form a bilayer if they were carefully poured onto the surface of water rather than being mixed up into the water? Why or why not?
Asked by mac - Mon Oct 5 02:19:50 2009 - Biology - 2 Answers - 1 Comments
A. Yes, phospholipids form bilayers spontaneously in the presence of water because Phospholipids have a hydrophilic(water loving) head and 2 hydrophobic(water hating) tails. Bilayers allow the tails to be away from the water while the heads are in contact with water.
Answered by x-Gay Boy-x - Mon Oct 5 02:26:53 2009
What differences would you find in the phospholipids of cold cells versus warm cells?
Q. you have grown two colonies of identical bacteria, one at 15 degrees C and one at 25 degrees C. Would the hydrocarbon tails be longer and the fats be more saturated in the cold cells?
Asked by Mom2twnzpls1 - Tue Feb 22 16:51:14 2011 - Biology - 1 Answers - Comments
A. No, its the other way around. In the warm cells, the lipids would be longer and more saturated. The cold cell will have shorter and more unsaturated lipids. This happens because the cell has to make its membrane more fluid at the lower temperature.
Answered by hcbiochem - Tue Feb 22 16:56:32 2011
Q. you have grown two colonies of identical bacteria, one at 15 degrees C and one at 25 degrees C. Would the hydrocarbon tails be longer and the fats be more saturated in the cold cells?
Asked by Mom2twnzpls1 - Tue Feb 22 16:51:14 2011 - Biology - 1 Answers - Comments
A. No, its the other way around. In the warm cells, the lipids would be longer and more saturated. The cold cell will have shorter and more unsaturated lipids. This happens because the cell has to make its membrane more fluid at the lower temperature.
Answered by hcbiochem - Tue Feb 22 16:56:32 2011
Why do Phospholipids form a double layer in the Plasma Membrane?
Q. Im confused ? why do phospholipids form a double layer in the plasma membrane?
Asked by Chels - Wed Dec 5 20:56:36 2007 - Other - Science - 1 Answers - Comments
A. well non-polar and non-polar mix together (oil and oil), and polar and polar mix together (like water). now a phospho lipid, if we look at the name, is a lipid (non-polar chain), attached to a phosphate head (that is polar). they basically look like tiny sperms, with a long non-polar tail and one polar end. So when you make a ball of them, the non-polars would go to the center, and the polar heads would go to the outside to be in contact with the surrounding water. when you make a bubble out of them, putting some polar water in the middle, the polar heads go out to the outside and the inside where the polar water is, and the non-polar lipids mix together in the membrane.
Answered by Lucas H - Wed Dec 5 21:04:40 2007
Q. Im confused ? why do phospholipids form a double layer in the plasma membrane?
Asked by Chels - Wed Dec 5 20:56:36 2007 - Other - Science - 1 Answers - Comments
A. well non-polar and non-polar mix together (oil and oil), and polar and polar mix together (like water). now a phospho lipid, if we look at the name, is a lipid (non-polar chain), attached to a phosphate head (that is polar). they basically look like tiny sperms, with a long non-polar tail and one polar end. So when you make a ball of them, the non-polars would go to the center, and the polar heads would go to the outside to be in contact with the surrounding water. when you make a bubble out of them, putting some polar water in the middle, the polar heads go out to the outside and the inside where the polar water is, and the non-polar lipids mix together in the membrane.
Answered by Lucas H - Wed Dec 5 21:04:40 2007
In the fluid mosaic model of cell mem., which of the following is a true statement about mem phospholipids?
Q. A) They can move laterally along the plane of the membrane. B) They frequently flip-flop from one side of the membrane to the other. C) They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane. D) They are free to depart from the membrane and dissolve in the surrounding solution. E) They have hydrophilic tails in the interior of the membrane.
Asked by Pearlfx - Sat Jul 12 00:13:49 2008 - Biology - 4 Answers - Comments
A. The answer is A, in the fluid mosaic model the membrane phospholipids are not stationary, but able to move about within the layer it currently resides B) cannot occur due to the hydrophilic and hydrophobic nature of the two ends of a membrane phospholipid C) suggests that other proteins and molecules like steroids don't also exist within the lipid bilayer, when in fact they do. Also there are some membrane proteins that traverse the entire bilayer like those that comprise an ion channel. D) once again the polarity of the phospholipids and their very purpose makes this answer absurd. E) hydrophilic means that it likes water, this would be the portion that is exposed the environment either inside the cell or outside the cell. It wouldn't be… [cont.]
Answered by kmillyon - Sat Jul 12 01:28:38 2008
Q. A) They can move laterally along the plane of the membrane. B) They frequently flip-flop from one side of the membrane to the other. C) They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane. D) They are free to depart from the membrane and dissolve in the surrounding solution. E) They have hydrophilic tails in the interior of the membrane.
Asked by Pearlfx - Sat Jul 12 00:13:49 2008 - Biology - 4 Answers - Comments
A. The answer is A, in the fluid mosaic model the membrane phospholipids are not stationary, but able to move about within the layer it currently resides B) cannot occur due to the hydrophilic and hydrophobic nature of the two ends of a membrane phospholipid C) suggests that other proteins and molecules like steroids don't also exist within the lipid bilayer, when in fact they do. Also there are some membrane proteins that traverse the entire bilayer like those that comprise an ion channel. D) once again the polarity of the phospholipids and their very purpose makes this answer absurd. E) hydrophilic means that it likes water, this would be the portion that is exposed the environment either inside the cell or outside the cell. It wouldn't be… [cont.]
Answered by kmillyon - Sat Jul 12 01:28:38 2008
Which molecule is more affected by heat - proteins or phospholipids?
Q. I did an experiment observing heat, alcohol, detergent and p H's affects on the cell membrane. One of the questions is, 'Which is affected more by heat (in the cell membrane) - proteins or the phospholipids?' I'm guessing proteins are more affected since they become denatured when exposed to too much heat, basically making them useless to cell function. Whereas phospholipids simply become more fluid and are able to gel back together. But Im not sure. Is this right?
Asked by Jay - Wed Feb 23 00:23:20 2011 - Biology - 2 Answers - Comments
A. You're right. Proteins will essentially become inactive after a certain range of temperatures (around 37 degrees C), while lipids will just be more "fluid," meaning they move around faster and easier.
Answered by - Wed Feb 23 00:28:10 2011
Q. I did an experiment observing heat, alcohol, detergent and p H's affects on the cell membrane. One of the questions is, 'Which is affected more by heat (in the cell membrane) - proteins or the phospholipids?' I'm guessing proteins are more affected since they become denatured when exposed to too much heat, basically making them useless to cell function. Whereas phospholipids simply become more fluid and are able to gel back together. But Im not sure. Is this right?
Asked by Jay - Wed Feb 23 00:23:20 2011 - Biology - 2 Answers - Comments
A. You're right. Proteins will essentially become inactive after a certain range of temperatures (around 37 degrees C), while lipids will just be more "fluid," meaning they move around faster and easier.
Answered by - Wed Feb 23 00:28:10 2011
Phospholipids can move laterally and allow water and other molecules to bass through into or out of the cell?
Q. Phospholipids can move laterally and allow water and other___molecules to pass through into or out of the cell. Fill in the blank. Is it polar or non-polar? Add on: This is known as simple___because it does not require___and the water or molecules are moving(up or down)___ the concentration gradient. Please fill in these blanks too
Asked by - Thu Oct 20 22:42:08 2011 - Biology - 3 Answers - Comments
A. polar. (water is a polar molecule because it has a negative side and a positive side to simplify things) diffusion energy (or it could possibly be) proteins down moving up the concentration gradient requires energy. think of it as paddling a boat upstream versus riding the current downstream.
Answered by - Fri Oct 21 00:11:05 2011
Q. Phospholipids can move laterally and allow water and other___molecules to pass through into or out of the cell. Fill in the blank. Is it polar or non-polar? Add on: This is known as simple___because it does not require___and the water or molecules are moving(up or down)___ the concentration gradient. Please fill in these blanks too
Asked by - Thu Oct 20 22:42:08 2011 - Biology - 3 Answers - Comments
A. polar. (water is a polar molecule because it has a negative side and a positive side to simplify things) diffusion energy (or it could possibly be) proteins down moving up the concentration gradient requires energy. think of it as paddling a boat upstream versus riding the current downstream.
Answered by - Fri Oct 21 00:11:05 2011
From Yahoo Answer Search: 'phospholipids'
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