Materials: 3 worksheets

• Catalyst (5 min):1. How did temperature affect the rate of a

reaction as seen in our Gizmo?2. What are 2 ways enzymes can be denatured?

Materials: 2 half sheets and paper from yesterday

• Catalyst:Identify the enzyme, substrate, and products in the following sentence.

A triglyceride is broken down into glycerol and fatty acids by lipase.

Elite Eight Trait Check-Up

1. Respect the Threshold1. Everyone on time?2. Silent for First Five?

2. Be Prepared (2 min)1. Seated2. Have materials3. Working on catalyst

Unit 1 Class Point Challenge

• Period 1: .77 • Period 2: .88 • Period 4: .90• Period 5: 1.28 Winners!!! • Period 6: .37• Period 7: .76

Class Motto

If there is a problem,We look for a solution.If there is a better way,

We find it.If we need help,

We ask.If a teammate needs help,

We give.

Announcements

• We will be talking about Science and Engineering Expo Projects on Thursday/Friday. Come with research question (I have some of yours)

• Enzymes Quiz Tomorrow• Enzymes project due– Thursday: Periods 1, 2, 4, 6– Friday: Periods 5, 7

Standard

• SB1b. Explain how enzymes function as catalysts.

Recap

• Catalysts speed up chemical reactions.• Enzymes are catalysts in living things.• Catalysts and enzymes work by lowering the

activation energy necessary for a reaction to occur.

EA is lowered by the enzyme

How are enzymes denatured?

• Denatured = Destroyed• Enzymes are denatured by high temperatures

and low pH (acids)

Collision Theory Gizmo

• How did temperature affect the speed of molecules in the Gizmo?

• How would this change the reaction?

So how would adding a catalyst affect the reaction?

• Would it affect the speed of the molecules?• Would it affect the speed of the reaction?

Objectives

• I can explain what it means for an enzyme to be specific, unchanged, and reusable.

• I can recall the two ways enzymes are denatured.

• I can identify the parts of an enzyme/substrate complex.

• I can summarize the importance of enzymes in living organisms.

Notes 2.3: Enzymes and Catalysts

• This is a continuation from last week! You may write on the same notes paper.

Substrate: the material that an enzyme binds to

Enzyme-Substrate Complex: enzyme and substrate together

Active site: location where the substrate binds on the enzyme

Enzymes

Enzymes

• Enzymes often end in “ase”– Lactase (breaks down lactose)–Helicase (unzips DNA)–Amylase (breaks down amylose)– Lipase (breaks down lipids)

Enzymes (Think – Pair – Share)• What’s a substrate?• What do enzymes usually end in?• Is lactase an enzyme or a substrate? How do

you know?• What do you predict is the substrate for the

enzyme sucrase?

Characteristics of Enzymes

• Enzymes are:–Specific–Unchanged in a reaction –Reusable

Enzymes are specific:• They only work with one reaction• The enzyme and the substrate fit together like

a lock and a key

Characteristics of Enzymes

Video

• Think: How does this game show related to the characteristics of enzymes?

Characteristics of Enzymes

Or you might see it like this…

• You will have to be ready to read a variety of different diagrams

Enzymes (Think – Pair – Share)• What is an enzyme?• What does it mean to say that enzymes are specific?• What does it mean to say that enzymes are

reusable?• Why are enzymes important?

Enzymes

What is structure X?

What is structure Y?

What is structure Z?

Enzyme Disorders*LEL (Low Enzyme Levels) is America's & the world’s number one cause of sickness and death.

*Inhibitors are molecules that decrease enzyme activity, and activators are molecules that increase activity. Drugs and poisons are often enzyme inhibitors.

• Cystic Fibrosis • Gaucher's Disease • Low Stomach Acid • Inflammatory Bowel

Disease/Syndrome• Intestinal

Inflammation

• Ulcerative Colitis • Ulcers• Acne• Gingivitis• Sprue• Pancreatic

Insufficiency

Classwork 2.3: Enzymes

• You will have 15 minutes to work on this assignment.

• Graded for accuracy!

Enzymes Project

Objective: Manipulate enzyme cut outs to represent a chemical reaction in our body.

Directions: 2 people at each table start with part A and 2 people start cutting. Then switch!

Panther Pass1. What do enzymes do?2. What does it mean to say that enzymes are

“specific”?3. What are the 2 ways enzymes are denatured?4. Which of the following statements best describes

enzymes?a) Enzymes cannot be reused after a reactionb) Enzymes are organic catalystsc) Enzymes slow down chemical reactionsd) Enzymes can bind to any substrate