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Enzyme Reactions. Name_______________________. Period _____
Date____________. Sucrose is a sweetener found in many candies. It is a
carbohydrate ...
Enzyme Reactions
Name_______________________ Period _____ Date____________
Sucrose is a sweetener found in many candies. It is a carbohydrate disaccharide made up of glucose and another sugar called fructose. When we eat sucrose, it must be digested or broken down into smaller substances, which our cells can absorb. An enzyme (protein) called sucrase speeds up this chemical reaction by breaking the chemical bond in sucrose, the substrate. High heat and strong acids or bases destroy the enzyme and would stop the chemical reaction. The only way to make the reaction go faster is to add more enzymes. Scientists support the “lock and key” model below for how an enzyme speeds up chemical reactions. The letters “ase” at the end of words help us identify enzymes.
1. Label A-E directly on the picture above: active site, substrate, enzyme, glucose and fructose 2. What is the substrate in the picture above?
3. What is the name of the enzyme?
4. What 3 letters in the enzyme’s name tells that it is an enzyme?
5. How can you tell from the diagram that sucrase is not used up during the chemical reaction?
6. What type of proteins speed up a chemical reaction?
7. How are enzymes destroyed?
pH and Enzyme activity Experiments were designed to study the effect of pH on the rate of enzyme action for 2 different enzymes found in animals, Enzyme A and Enzyme B. Enzyme A is found in the stomach and digests meats. Enzyme B is found in the intestine and digests facts. Use the graph to answer the following questions
Enzyme A and B Activity
Relative Reate of Enzyme Action (percent)
100 Enzyme A
80
Enzyme B
60 40 20 0 0
2
4
6
8
10
12
14
pH
1. At what pH is Enzyme A working at its maximum rate?
2. Since Enzyme A is found in the stomach, what is the probable pH of the stomach?
3. At what pHs does Enzyme A not work?
4. At what pH is Enzyme B working at its maximum rate?
5. Since Enzyme B is found in the intestine, what is the probable pH of the intestine?
6. If Enzyme A were produced in the intestine, would this enzyme still carry out its usual function of digestions? Explain.
