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Enzymes. Review (on page 162) Organic compound Protein Catalyst Changes the rate of chemical reactions Involved in all metabolic processes Enzymes act.

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Presentation on theme: "Enzymes. Review (on page 162) Organic compound Protein Catalyst Changes the rate of chemical reactions Involved in all metabolic processes Enzymes act."— Presentation transcript:

1 Enzymes

2 Review (on page 162) Organic compound Protein Catalyst Changes the rate of chemical reactions Involved in all metabolic processes Enzymes act on molecules called substrates The enzyme active site fits into the substrate Lock and key model of enzyme function Enzymes do not change the substrates Afterwards, enzymes are released and will facilitate again and again Important in digestion, respiration, reproduction, vision and movement

3 Lock and Key Model of Enzyme Function

4 Mini lab The Action of Enzymes on Carbohydrates Cornstarch is just what it sounds like: starch derived from corn. It is ground from the white endosperm at the heart of a kernel of corn. Cornstarch is used as a thickening agent in cooking, a health-conscious alternative to talc, and the main ingredient in a biodegradable plastic. It is also mixed with sugar to make powdered sugar.powdered sugar In the kitchen, cornstarch can be used as a binder for puddings or similar foods, or as a thickener for sauces, stews, and similar dishes. A simple pudding can be made with milk, cornstarch, and sugar. Cornstarch can form unappetizing clumps in hot water, so if you need to thicken something that is already cooking on the stove, mixing a bit of cornstarch in a glass with cold water before adding it to the pot is advised.

5 Amylase Amylase (English pronunciation: /ˈæmɪleɪz/) is an enzyme that catalyses the breakdown of starch into sugars. Amylase is present in human saliva, where it begins the chemical process of digestion. Food that contains much starch but little sugar, such as rice and potato, taste slightly sweet as they are chewed because amylase turns some of their starch into sugar in the mouth. The pancreas also makes amylase (alpha amylase) to hydrolyse dietary starch into disaccharides and trisaccharides which are converted by other enzymes to glucose to supply the body with energy. Plants and some bacteria also produce amylase./ˈæmɪleɪz/ enzymecatalysesstarch sugarssalivadigestionrice potatopancreasalpha amylaseglucose


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