STARTERFill in the missing words – what do you know about enzymes

Enzymes are ………. . They have an ……. site which is a particular shape. A specific ………. fits into this like a key in a ……… . Enzymes work best at an optimum …… and optimum …………. .

pH protein substrate active temperature lock

Learning Outcomes

Enzymes

ALL State the properties of enzymes

MOST Describe the effect of temperature and pH on the enzyme

SOME Describe the role of enzymes in respiration and protein synthesis

How Enzymes Work

Enzyme SubstrateProducts

Active site

(Biological Catalysts)

enzyme properties

1. They are proteins

2. Sensitive – respond to changes

3. Used again – because they don’t change

4. Sensitive to temperature – use animation to plot a graph to show the effect of temperature on enzyme activity

5. Sensitive to pH – how acid (pH 1 – 6) / alkaline ( pH 8 – 14) something is (neutral pH 7)

5. Sensitive to pH – how acid (pH 1 – 6) / alkaline ( pH 8 – 14) something is (neutral pH 7)

pH can affect the shape of the ACTIVE SITE which prevents the

substrate fitting in, so NO products are made

Effect of pH on enzyme activityISA

Ensure that you are working safely by

following the safety advice of your teacher!

Watch the teacher demonstration!

Follow the instructions carefully on your practical sheet

Role of enzymes in Cells

Enzyme control all of the following processes

RESPIRATIONPROTEIN

SYNTHESIS

PHOTOSYNTHESIS

DIGESTION

Aerobic RespirationUse pages 180 and 181 to find out more about the role of ENZYMES in AEROBIC

RESPIRATION.

Complete pages 4 and 5 in your workbook

Protein synthesis & photosynthesis

Use your knowledge from previous lessons to complete page 6 in your workbook

e.g. knowledge from workbook 1 and 2

Learning Outcomes

Enzymes

ALL State the properties of enzymes

MOST Describe the effect of temperature on the enzyme

SOME Describe the role of enzymes in respiration and protein synthesis

Plenary

COMPLETE EXAM QUESTIONS