Exploring Models of Enzyme Reactions MODEL 1-LACTASE BREAKS DOWN LACTOSE Enzymes are active in all cells as well as in the digestive system. Lactase is found in the digestive system, and is one of many enzymes in mammalian intestines that help break down food molecules into pieces small enough to be absorbed into our cells. Specifically, lactase breaks the sugar lactose, a disaccharide, into two monomers, glucose and galactose. Model 1: Lactase breaks down lactose 1. Model 1 represents a reaction in which lactose is broken apart with the assistance of the enzyme lactase. Label the following on Model 1: ▪ Lactose ▪ Lactase The active site of lactase ▪ The enzyme-substrate complex (the temporary molecule formed when the substrate is in the active site of the enzyme) ▪ The products of the reaction (glucose and galactose) . 2. Using the names of the reactants and products (instead of chemical formulas), write a chemical equation for the reaction catalyzed in Model 1. Hint: Only reactants and products are included in a chemical reaction. Student Resource 2021 College Board 3 HANDOUT 3.1.A Pre-AP Biolog
Exploring Models of Enzyme Reactions MODEL 1-LACTASE BREAKS DOWN LACTOSE Enzymes are active in all cells as well as in the digestive system. Lactase is found in the digestive system, and is one of many enzymes in mammalian intestines that help break down food molecules into pieces small enough to be absorbed into our cells. Specifically, lactase breaks the sugar lactose, a disaccharide, into two monomers, glucose and galactose. Model 1: Lactase breaks down lactose 1. Model 1 represents a reaction in which lactose is broken apart with the assistance of the enzyme lactase. Label the following on Model 1: ▪ Lactose ▪ Lactase The active site of lactase ▪ The enzyme-substrate complex (the temporary molecule formed when the substrate is in the active site of the enzyme) ▪ The products of the reaction (glucose and galactose) . 2. Using the names of the reactants and products (instead of chemical formulas), write a chemical equation for the reaction catalyzed in Model 1. Hint: Only reactants and products are included in a chemical reaction. Student Resource 2021 College Board 3 HANDOUT 3.1.A Pre-AP Biolog
Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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Hello Would Appreciate if someone could help fill in my notes !! Thank you
Transcribed Image Text:sson 3.1: Simulation of Enzymatic and Cellular Reactions
nit 3: Cellular Systems
HANDOUT
3.1.A
3. Referring to the chemical reaction you wrote for the question above, is lactase a
reactant, a product, or neither? Explain how you know.
4. Describe the role the enzyme lactase played in the reaction.
5. What do you think could happen to the enzyme lactase at the end of the reaction?
6. Enzymes play very specific roles in cells, and will work only on specific substrates.
For example, while lactase breaks down lactose, lipase is an enzyme that breaks
down lipid molecules. Using lipase and lactase as examples, describe how most
enzymes are named.
7. Suppose the image below is a model of a different disaccharide, sucrose.
Would lactase be able to break down sucrose? Explain your answer in terms of
the model.
Transcribed Image Text:Exploring Models of Enzyme Reactions
MODEL 1-LACTASE BREAKS DOWN LACTOSE
Enzymes are active in all cells as well as in the digestive system. Lactase is found in
the digestive system, and is one of many enzymes in mammalian intestines that help
break down food molecules into pieces small enough to be absorbed into our cells.
Specifically, lactase breaks the sugar lactose, a disaccharide, into two monomers,
glucose and galactose.
Model 1: Lactase breaks down lactose
Lesson 3.1: Simulation of Enzymatic and Cellular Reactions
Unit 3: Cellular Systems
1. Model 1 represents a reaction in which lactose is broken apart with the assistance
of the enzyme lactase. Label the following on Model 1:
▪ Lactose
▪ Lactase
The active site of lactase
▪ The enzyme-substrate complex (the temporary molecule formed when the
substrate is in the active site of the enzyme)
▪ The products of the reaction (glucose and galactose)
2. Using the names of the reactants and products (instead of chemical formulas),
write a chemical equation for the reaction catalyzed in Model 1. Hint: Only
reactants and products are included in a chemical reaction.
Student Resource
2021 College Board
3
HANDOUT
3.1.A
Pre-AP Biolog
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