Disulfide bridges also can shape proteins‚ disulfide bridges form when two cystine monomers that have sulfhydryl groups are brought close together when the protein folds. Sometimes a protein can have more than two polypeptide chains all in one functional molecule‚ a quaternary structure can result from
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molecular structure. 6.1.1. DEFINITION: The word polymer is derived from the two greek words‚ poly and meros‚ meaning many and parts or units respectively. Polymers are macro molecules formed by linking smaller molecules repeatedly‚ called monomers. Examples: Polythene is formed by linking a large number of ethene (or ethylene) molecules together as shown below. Similarly polystyrene is formed by linking styrene molecules together. The number of repeating units (n) in
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(CH2)n -> plastic 1D – identify that ethylene serves as a monomer from which polymers are made * Individual monomers of ethene join by covalent bonds to form long chain polymers 1E – identify polyethylene as an addition polymer and explain the meaning of this term * Addition polymerisation to form polyethylene (polyethene) * Ethene monomers join by organic peroxide breaking double C=C bond allowing another monomer to join by single covalent bond * No other product produced
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to the fact that the monomer of PP(C3H6) has one more -CH2 than the monomer of PE(C2H4). Hence PP has a bigger molecular size than that of both LDPE and HDPE and more heat energy is required to overcome the intermolecular forces between PP molecules than that of LDPE and HDPE. Nylon has the highest average melting temperature (252.5°C) among the 4 polymers. The three polymers: LDPE‚ HDPE and PP are homopolymers while Nylon is a copolymer which is made up of 2 different monomers: diamine and dicarboxylic
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As mentioned previously‚ PE is one of the most important polymers in the world. ADMET has been used to systematically model commercially relevant polymers‚ specifically PE and copolymers of ethylene and another monomer. ADMET is capable of producing PE with specific sequences of monomer units‚ as well as random copolymers via copolymerization with 1‚9-decadiene. The ability to precisely synthesize these polymers has opened the door to exploring the molecular origins of the material properties of
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contain carbon‚ hydrogen and oxygen in the ratio of 1.2.1.. There are many different types of carbohydrate‚ all of which are useful to living organisms. The most important carbohydrate is probable glucose. Glucose is a monosaccharide and is the monomer unit which makes up more complex polysaccharides. Two glucose molecules can be joined in a condensation reaction‚ whereby water is removed‚ for example to produce maltose‚ a disaccharide. The bond between the glucose molecules is a 1-4 glycosidic
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polymers of glucose. They differ in the type of glucose present and the bonds which link thr glucose monomers together. Starch and glycogen are made from alpha-glucose. This is an isomer of glucose in which the hydroxyl (-OH) group attached to carbon number 1 is below the plane of the ring. Starch is itself composed of two types of polymer:amylose and amylopectin. In amylose‚ the glucose monomers are linked by 1‚4 glycosidic bonds. This means that the bond connects carbon atom number 1 in one glucose
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They also have different functions. Describe how the structures of different polymers relate to their function? Polymers a large molecules made up of a chain of smaller molecules‚ known as monomers. The monomers that a polymer is made up of decide its structure and therefore it’s function. These monomers are linked and coiled in a very specific manor giving the polymer a specific tertiary structure (an extensively coiled and linked polymer chain caused as a result of the formation of more bonds
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COMMON SYNTHETIC PLASTICS INRODUCTION Plastic molecules are made of long chains of repeating units called monomers. The atoms that make up a plastic’s monomers and the arrangement of the monomers within the molecule both determine many of the plastic’s properties. Plastics are one of the classification of polymers .If a polymer is shaped into hard and tough utility articles
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Each Question is worth 5 pts. A maximum of 20 pts may be added to your first exam 20 x (correct pts / total pts) Question 1 Actin and tubulin form self-assembling polymers. Where on the filaments do subunits exchange with free monomers? Subunit exchange with free monomers occurs at the end of filaments. In actin filaments‚ subunits can be freely exchanged at both ends of the filament (pointed and barbed ends) until the actin formation reaches a steady state. At this point‚ the subunits are added
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