Mastering Biology Suggested Answer Book Essay

The rate of reaction increases when the polyphenol oxidase constriction increases. 1m b Rate of reaction = 1/18 = 0.056 1m From the graph, the enzyme concentration is around 1.15%. 1m c Use boiled enzyme in the tube. 1m d The enzyme does not work in acerb medium. / The enzyme is denatured in acidic medium. 1m e The colour qualify becomes faster at start 0.5m as enzyme activity increases with temperature. 0.5m When temperature becomes also high, no further colour change will be observed 0.5m as the enzyme is denatured. 0.5m f The rate of reaction drops / halt if all active sites of the enzymes atomic number 18 blocked. 1m The inhibitor competes with normal substrate for active sites. 1m 11 HKCEE biological science 2003 I Q3b Essay (p. 4-23) 12 Enzymes are biological catalysts, speeding up metabolic reactions without being used. 1m Enzymes can be reused.Enzyme molecules refund to its original form after complementary the reaction. 1m Enzymes are required in relatively small amount because enzymes remain unchanged in the reaction. 1m Enzymes are proteins. They are soft denatured by high temperatures and native values of pH. 1m The actions of enzymes are specific. Each enzyme catalyses that one type of reaction. 1m Examples of enzyme application biological washing powder, papain in meat tenderizers, enzyme to change state milk to produce cheese, enzyme to modify the stiffen in bread, enzymes to break down works cell wall in proceeds juices, enzymes to remove hairs from hides 1m Advantages of using enzymes in the to a higher place applications Enzymes are specific in action. This reduces the doing of unwanted products. 1m Enzymes are efficient in small amounts. This lowers the cost of production.