What is the role of an enzyme in a chemical reaction?

Enzymes speed up chemical reactions by lowering the activation energy required.

Explain the 'lock and key' analogy in the context of enzyme-substrate interaction.

The 'lock and key' analogy describes the specific fit between an enzyme's active site and its substrate, where only a specific substrate can bind to a particular enzyme, similar to how a key fits a specific lock.

What is the active site of an enzyme, and why is it important?

The active site is the specific region of an enzyme where the substrate binds and where the chemical reaction occurs. It is crucial because its shape and chemical properties determine the enzyme's specificity and catalytic activity.

Describe the difference between competitive and allosteric (non-competitive) inhibition of enzyme activity.

Competitive inhibition involves an inhibitor binding directly to the active site, blocking substrate binding. Allosteric inhibition involves an inhibitor binding to a different site on the enzyme, altering the enzyme's shape and reducing its activity.

Enzymes and Metabolic Reactions

12th GradeBiology60 min

Learning Objective

Enzymes speed up metabolic reactions by lowering energy barriers; and regulation of enzyme activity helps control metabolism

Lesson Flow

Watch Video

12 min

Enzymes

Bozeman Science

Guided Notes

12 min

Key concepts students will learn:

•
Enzymes are chemicals that speed up a reaction, but are not consumed in the reaction.
•
An enzyme's active site is where the substrate binds, allowing a chemical tug that lowers activation energy.
•
Competitive inhibition is when a chemical blocks the active site, while allosteric inhibition changes the enzyme's shape.

Practice

18 min

12 questions • Multiple choice & Short answer

Exit Ticket

5 min

“Explain how an enzyme, such as catalase, speeds up a chemical reaction, referencing the terms 'active site' and 'substrate'.”

Teacher Guide

Get the complete package:

Answer keys for all questions
Differentiation strategies
Extension activities
Printable student handouts

Enzymes and Metabolic Reactions

Learning Objective

Lesson Flow

Watch Video

Guided Notes

Practice

Exit Ticket

Teacher Guide

New to Insta~Lesson?

About Insta~Lesson

How Insta~Lesson Helps Teachers Plan

How Insta~Lesson Supports Instruction Schoolwide