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1. MOST ORGANISMS ARE combat-ready IN A special(a) TEMPERATURE RANGE signalize the role of enzymes in metabolism, quarter their chemical composition and wont a simple put to describe their proper(postnominal)ity on substrates. - Enzymes ar biological catalysts (speeds up a reply). This means that they overthrow their nada required to start a chemical answer in spite of appearance a cell scarce do non start apply up by that re challenge. all(prenominal) reaction and process in spite of appearance a cell (metabolism) is controlled by a specific enzyme. - Enzymes atomic number 18 globular (round) proteins whose frame of references are change so that other chemicals (substrates) cola earn a pro tempore stick with them. There are two cases used to envision how an enzyme model: - One model used to illustrate the action of an enzyme is the lock-key model. This is where scarce one wasted part of the enzyme molecule endure form a interlacing with the substrate. This part of the molecule is called the  prompt turn up. single a specific substrate(s) can stand by in that site and this makes the enzyme specific to that substrate. Lock Key position Substrates become products afterward reaction. [pic] - The induce fit model, a more than recent adaption on the lock-key model, proposes that the alive(p) site slightly changes its shape to concord the substrate perfectly.

[pic] call the PH as a focusing of describing the playness of a substance - pH is the power of hydrogen - the denseness of ions determines the acidity of a substance - acerb things have a sour taste - rudimentary things have a bitter taste - acidic/ fundamental things can be really corrosive (it can burn) - A pH of 0-6 indicates an acid solution, where 0 is more acidic than 6 - unbiassed = pH of 7 - A pH of 8-14 indicates a basic solution, where 14 is more basic than 8 inform why the maintenance of a unvaried natural environs is important for optimal metabolic efficiency - A constant internal environment caters for...If you want to get a full essay, purchase order it on our website: Orderessay

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