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Describe the unique properties building-block molecules and biological importance of the three important groups of lipids fats phospholipids and steroids?
Bratzybabe430890
III. Lipids are diverse group of hydrophobic molecules, all hydrophobic; includes waxes and pigments not discussd A. Fats - not polymers, large molecules assembled from smaller molecules - glycerol and fatty acids 1. glycerol = alcohol w/ 3 C, each with a OH group 2. fatty acid = long C skeleton, 16-18 C long (fig 5.11) a. carboxyl group at end b. long chain of hydrocarbons - C-Hbonds are nonpolar, producing hydrophobic molecule c. 3 fatty acids join to the carbon skeleton, making a triglyceride, aka triglycerol d. fatty acids attached to the chain can be the same or different e. if there are no double bonds btn C, chain is straight - saturated fatty acid - solid =fats f. if double bonds occur, chain is kinked- unsaturated - will be liquid = oils g. cis bonds vs. trans bonds in hydrogenated products 1. trans fats in hydrogenated products may contribute more to atherosclerosis than saturated fats h. fat is very useful - a gram of fat stores more than 2x as much energy as a gram of polysac 1. compact storage for animals on the move (Plants don't have to move) 2. storage, warmth and cushioning B. Phospholipids -similar to fat, but only 2 fatty acids 1. 3rd hydroxyl group of glycerol attaches to negatively charged phosphate group (Fig. 5.13) a. other small charged molecules can attach to phosphate group to form phospholipids 2. head is hydrophilic, tail is hydrophobic (fig 5.14) a. in water, phospholipids self assemble into bilayers to shield hydrophobic portions from H2O 3. cell membranes are made of this, form a boundary btn cell and environment that is semipermeable C. Steroids - lipids w/ 4 fused rings for C skeleton (f.g 5.15) 1. functional groups vary 2. cholesterol a. common in cell membranes b. precurser of other steroids, eg. sex hormones and other hormones c. cholesterol is important, too much is bad
SOURCE: www.ltcconline.net/kloss/bio101/ch5.doc
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Which molecule has hydrophilic and hydrophobic properties and would be found in plasma membranes?
That would be phospholipids. They are a major component of the plasma membrane and contain hydrophilic, as well as, hydrophobic properties.
When mixed with water phospholipids spontaneously form membranes. what properties of phospholipids cause this to happen?
Hydrophilic phosphate groups that are attracted to water and hydrophobic fatty acid tails that avoid water.
What are the physical properties of ash?
what is the biological,chemical and physical properties of fly ash when it is use as a carrier
How are the properties of phospholipids important in membrane functions?
Phospholipids are really just fat cells that exist in our membranes. They serve two very important functions. The most important are they help with temperature control. When the membrane gets cold, the phospholipids keep the membrane from freezing and becoming stiff, and when it gets too hot, they keep the cells form sticking together and melting
Importance or usefulness of chemical composition?
Properties of materials depends on the chemical composition.
Biological importance of water?
Water is an essential component for the survival of organisms. Some of its importance include: being a universal solvent, involved in almost all biochemical processes in the body, and its thermal properties are suitable to support life.
Which molecule has hydrophilic and hydrophobic properties and would be found in plasma membranes?
That would be phospholipids. They are a major component of the plasma membrane and contain hydrophilic, as well as, hydrophobic properties.
When mixed with water phospholipids spontaneously form membranes. what properties of phospholipids cause this to happen?
Hydrophilic phosphate groups that are attracted to water and hydrophobic fatty acid tails that avoid water.
What are the physical properties of ash?
what is the biological,chemical and physical properties of fly ash when it is use as a carrier
What are the importance of landed properties?
The importance of landed properties ensure the families stay on the society's upper echelons. It also ensures the future wealth of the next generations.
What position within a structure indicates importance?
properties
Chi-square test properties and importance?
square
Do Molecules have a rigid and inflexible three dimensional shape which contributes to their biological properties?
no
How are the properties of phospholipids important in membrane functions?
Phospholipids are really just fat cells that exist in our membranes. They serve two very important functions. The most important are they help with temperature control. When the membrane gets cold, the phospholipids keep the membrane from freezing and becoming stiff, and when it gets too hot, they keep the cells form sticking together and melting
Do enantiomers have the same biological properties?
No, they differ in biological activity because a specific arrangement of atoms in a specific enantiomer may react with a particular enantiomer of another compound present in biological systems while other does not.
Why are enantiomers of biological interest?
Mainly because enantiomers have identical physical and chemical properties. However, the difference between two enantiomers can have tremendous impact, especially in biological systems, because many important biological molecules are chiral.
Importance or usefulness of chemical composition?
Properties of materials depends on the chemical composition.
