Lesson Starter What is the name of the muscular tube which connects the mouth and stomach? Describe the process of peristalsis Describe the role of churning.

Slides:

Advertisements

Similar presentations

Starter Activity: Write down as much as you can on a show me board about making proteins.

Advertisements

Connect How many of you have heard “Chew your food”? Why is it important? What does your body use to assist in digestion? Do you know someone who is lactose-intolerant?

What are enzymes??  Enzymes are proteins.  Enzymes speed up chemical reactions.  Biological Catalyst  pH, temperature, and substrate concentration.

Aim: What factors affect the rate of enzyme activity? I. Factors that affect rate of Enzyme Activity A. The amount of substrate.

The Stomach Lab What liquids does the stomach need for digestion?

MENU OF THE DAY. TEMPER SIZE SPEED HEIGHT Enzymes’

Higher Human Biology The role of enzymes. Learning Intentions By the end of this lesson we will be able to: 1. State what enzymes are. 2. Describe the.

Factors Affecting Enzymes

Enzymes: “Helper” Protein molecules

Quick test What is the definition of a catalyst?

Key words: Denatured, Optimum temperature, PH

Aim: How does temperature and pH affect enzyme activity?

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” P s1.

Biological catalysts Enzymes.

LO: What environmental factors affect enzyme activity?

Lesson Starter Without using your jotter, try and come up with the highest scoring word from the last lesson on the digestive system. Letters can.

Aim: What can affect the rate of enzyme reactions?

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

Topic: Enzymes Aim: Why are enzymes important to living things?

Enzymes: “Helper” Protein molecules

Enzymes: Specialized Protein molecules

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein Molecules

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

Investigating Catalase

Enzymes: “Helper” Protein molecules

Enzymes Living organisms are dependent on chemical reactions to survive. These chemical reactions happen TOO SLOWLY or require TOO MUCH ENERGY for us.

Lesson Starter What are enzymes made out of?

Chemistry of Life Enzymes.

Enzymes: “Helper” Protein molecules

Tuesday Bell Ringer Draw and label the parts of an amino acid.

Lesson Starter With reference to the graph, explain the effect of temperature on enzymes.

Enzymes: “Helper” Protein molecules

Topic: Enzymes (a.k.a “Helper” Protein molecules ) Aim: Why are enzymes important?

Enzymes: “Helper” Protein molecules

Lesson Starter What makes the small intestine perfect for absorption of food? What is the job of bile? What 3 enzymes are added by the pancreas?

Lesson Starter: answer in sentences

Starter Read pg. 116 and answer question 4 on your worksheet.

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

How can we make digestion efficient?

Enzymes: “Helper” Protein molecules

Unit 3 Science Investigation Skills

Enzymes: “Helper” Protein molecules

Topic: Enzymes Aim: Why are enzymes important to living things?

Enzymes - Attempt 3 (your target + 1 up and down)

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

All enzymes are …………. molecules

Enzymes: “Helper” Protein molecules

How can we make digestion efficient?

How important are enzymes?

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

Enzymes: “Helper” Protein molecules

Presentation transcript:

Lesson Starter What is the name of the muscular tube which connects the mouth and stomach? Describe the process of peristalsis Describe the role of churning in the stomach

Learning Intention To be able to explain where pepsin is produced To be able to describe the role of pepsin To investigate the effect of pH on pepsin

Optimum conditions for enzymes The more ACTIVE an enzyme is, the faster the REACTION RATE Enzyme at its most active- OPTIMUM CONDITIONS Temperature pH Out with optimum- not enough/ dentaure

Optimum temperature Enzymes are everywhere (not just inside us) Body enzymes- 37°C Before 37°C- not enough energy, few collisions, UNDAMAGED 35-40ish°C- WORKING RANGE- enzyme works, OPTIMUM=37°C >40°C- DENATURED, lost shape, lock and key

What is pH?

Optimum pH Different enzymes have a different working range Acid Neutral Alkaline

Pepsin Digestive enzyme Produced in the stomach Speeds up breakdown of protein Peptides

Pepsin experiment- overview Observe the change in disks of egg white (protein) when pepsin is added at 3 different pHs.

Pepsin experiment (copy and complete) AIM To find out the OPTIMUM pH for the enzyme PEPSIN Hypothesis What do you expect to happen in this experiment? I think that pepsin will work best in _______ conditions

Experiment Instructions *WEAR YOUR GOGGLES* Apparatus 3 x test tubes Test tube rack Bottle of pepsin Bottle of acid Bottle of alkali Bottle of neutral 3 x egg white disks labels Instructions *WEAR YOUR GOGGLES* Collect apparatus Label your 3 test tubes- (acid, alkali, neutral) Place a disk of egg white in each test tube Cover each disk with PEPSIN Add 5mls of acid to the test tube labelled acid (alkali to alkali, neutral to neutral) Place in water bath at 40°C Leave for 15-20 mins (clear up chemicals) Examine the appearance of egg white

Method Apparatus list- write down a list of all the chemicals and equipment that you used Step by step instructions- write down instructions that someone else could follow to do this exact experiment Diagram- Draw a LABELLED diagram using a RULER to show how the set up is arranged

Results Describe the appearance of your egg white in each of the test tubes (stating which pH they have been in at) Conclusion What is the optimum pH for pepsin? How do you know? Did your hypothesis agree with the results? Explain why it is important that pepsin works best at this pH, considering where it is found in the body.