Enzymes - IGCSE

3. An enzyme capable of digesting proteins into amino acids
7. 3 words. Model of enzyme activity that explains how a particular enzyme will only fit with one particular type of substrate.
11. 2 words. The part of an enzyme or antibody where the chemical reaction occurs.
13. The movement energy that substrates and enzymes have
14. A substance produced in a chemical reaction
15. A factor that can decrease enzyme activity away from its optimum by affecting the shape of the active site. E.g. acids or alkalis
16. A biological catalyst made from protein that speeds up chemical reactions without being used up
18. catalyzes the decomposition of hydrogen peroxide to water and oxygen
19. An enzyme secreted in the digestive tract that catalyzes the breakdown of fats into individual fatty acids and glycerol that can be absorbed into the bloodstream

1. An enzyme that is secreted by the salivary glands and by the pancreas to break carbohydrates down into sugars
2. Only one enzyme catalyses one reaction with one type of substrate, so enzymes are highly __________________.
4. the molecule(s) that fits into the enzyme active site and is either broken down or combined
5. the process when an enzyme loses its activity due to a change in the shape of its active site so that it cannot bind to the substrate
6. When an enzyme active site hits a substrate molecule
8. A factor that increases enzyme activity up to an optimum, due to more energy for collisions. Beyond optimum it denatures enzymes.
9. Denaturation changes the _____________ of the active site
10. When the enzyme active site and substrate attract together, they _________________
12. Collisions between enzyme active site and substrate are called this when they lead to the formation of product
17. a substance that speeds up the rate of chemical reactions (by lowering activation energy) without being used up itself