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GCSE School level biology revision notes: Digestive system, its function and role of enzymes

SITEMAP  Use page sub-index, take time to study the content on ENZYMES

Metabolic chemistry - Our digestive system and ENZYMES - their structure, function and optimum conditions of these amazing molecular biological catalysts, and enzyme reaction investigations

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See also Enzymes and Biotechnology

(GCSE/IGCSE chemistry notes)

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Sub-index for enzymes and digestive system pages

1. Introduction - Metabolism, what are enzymes? why so important in living system?

2. How do enzymes work? 'Key and lock' mechanism theory - supported by scientific evidence

3. Effect of changing concentration of the substrate for an enzyme catalysed reaction?

4. Effect of changing pH - What is the optimum pH of an enzyme catalysed reaction?

5. Effect of temperature - What is the optimum temperature for an enzyme catalysed reaction?

6. Introduction to methods of measuring enzyme activity (see 7. and 8. for method details)

7. Method 1. A method of measuring the rate of product formation from an enzyme reaction - the decomposition of hydrogen peroxide by the enzyme catalase - collecting oxygen gas - investigating the effect of changing pH, temperature and concentration

8. Method 2. A colour change method of measuring the reduction of substrate concentration in an enzyme reaction - the starch to maltose reaction - effect of pH, temperature and concentration changes

includes Using a colorimeter to follow the reaction using a colour intensity change

9. Details of how the digestive system works and the role of gut bacteria and fungi (then 10.)

10. A summary of the human body's enzyme production sites and the digestive system

11. Enzymes and digestion - big protein/carbohydrate/fat molecules to small molecules!

12. Enzymes - synthesis of carbohydrates/proteins/lipids - small molecules to big molecules!

13. Doc Brown's unoriginal bread recipe! - excellent example of domestic enzyme technology!

14. Enzymes and Biotechnology (GCSE/IGCSE level chemistry notes)

See also Surfaces for the exchange of substances in animal organisms (includes small intestine)


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