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?
