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Investigating Enzymes By Hannah Robinson Aim: The aim of this experiment is to find out how a certain factor that is changed will affect the reaction rate of enzymes. Enzymes are globular proteins which act as biological catalysts. A catalyst is a molecule which speeds up reactions without being used up itself. All globular proteins have a tertiary structure, which makes them very easily altered by pH and temperature. Enzymes are different to other globular proteins as they have an active site to which other molecules can bind. The molecule is called the substrate for that enzyme. The shape of the active site allows the substrate to fit perfectly and be held in place by temporary bonds between the substrate and the R groups of the enzymes amino acids. An amino acid The combined structure is called the enzyme-substrate complex. The active site for all molecules of one enzyme is made up of the...

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