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Understanding Breakdown Reactions in Biology: Enzymes and Their Functions

In this lesson, we explore breakdown reactions, where large molecules are degraded into smaller ones through enzymatic activity. We will learn to describe and identify breakdown reactions diagrammatically. Key enzymes, such as catalase and amylase, will be examined, including their roles in degrading substances like hydrogen peroxide and starch, respectively. The effectiveness of these reactions will be tested using Benedict’s solution, which changes from blue to brick red in the presence of reducing sugars, such as maltose.

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Understanding Breakdown Reactions in Biology: Enzymes and Their Functions

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  1. National Biology Protein and Enzymes e: Breakdown reactions

  2. Recap • Complete Quiz-Quiz-Trade activity

  3. What are we learning today? We are learning to: • Describe what is meant by a breakdown reaction • Recognise a breakdown reaction in diagrammatic form • State the name of an enzyme involved in a breakdown reaction • State the test for a reducing sugar Success criteria: • Breakdown – large molecules broken to make smaller molecules • Examples of breakdown enzymes • Benedicts solution blue to brick red

  4. water oxygen catalase Breaking down reactions • In this reaction, catalase breaks down hydrogen peroxide into water and oxygen. • When enzymes are used to break things down it is called DEGRADATION hydrogen peroxide

  5. amylase starch maltose Example of a degradation reaction • Starch can also be degraded to simple sugar by the enzyme amylase.

  6. Experiment • Aim: to break down starch into maltose using the enzyme amylase • To test to see if the reaction has been successful the Benedicts test will be carried out

  7. Summary • Amylase breaks down starch into maltose • Benedict’s solution is a test for reducing sugars such as maltose • Benedict’s solution changes colour from blue to brick red in the presence of maltose

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