Enzyme 2.5 / 5 based on 2 ratings ? BiologyEnzymes and digestionGCSEAQA Created by: SophieCreated on: 03-04-13 17:30 Digestive Enzymes starch, protein & fats too big to pass through digestive system sugars, amino acids, fatty acids & glycerol small enough, pass through easily 1 of 6 Bile produced in liver stored in gall bladder released into small intestines an alkaline hydrochloric acid in stomach makes ph too acidic for enzymes so it neutralises the acid makes conditions alkaline, best for enzymes emulsifies fats- breaks fat into tiny droplets this gives a bigger surface area of fat easier for lipase to work so faster digestion 2 of 6 Enzymes chemical reactions in the body are carefully controlled by enzymes acts as biolgical catalysts (a catalyst is a subtance whioch increases the speed of a reaction without being changes or used up in the reaction) reduces the need for high temps only have enzymes to speed up useful reactions proteins-made of chains of amino acids act as structural compnents of tissue, horomones and antibodies unique shape, fits onto substance involved in a specific reaction only catalyse one reaction 3 of 6 Tempreature, ph and Enzymes Enzymes in human body work best at 37oc too hot- bonds holding enzyes together break- destroys special shape-won't work-denatured enzymes have optimum ph, often ph7 neutral too high of too low ph- denatures enzyme pepsin- breakes down protiens in stomach-works best at ph2- suitted to acid conditions 4 of 6 Uses of Enzymes Sugar syrup: used from making sweets and sports drinks cheap strach solution made from water, potatoes and maize carbohydrase enzyme breaks down strach into sugar Baby food: babies digestive system not fully developed protease enyme added to break down protiens inot amino acids easier for babies to absord nutreins Slimming foods: fructose made from glucose using isomerase enzymes fructose is sweeter than glucose or surcose so you need less to get the same sweetness, less calories Biolgical detergents: protease and lipase enzymes break down plant and animal matter ideal for removing stains more effective at lower temps than other types of detergents 5 of 6 Advantages and Disadvantages for Enzymes Advantages Biodegradable Work in mild conditions reducing the need for dangerous chemicals- better for environment, saves energy Specific, only catalyse reaction you want Can work for long time, after initial cost can be continually used for are cheap Disadvantages Rapidly lose their catalytic ability if subject to unfavourable conditions Some can only be used once because they are denatured in process Expensive to produce Some people allergic to enzymes 6 of 6
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