The pH indicator bromothymol blue in an alkaline solution and yellow in an acidic solution a slight increase in acidity such as when CO2 gas is added causes a solution with the indicator to change from blue to yellow

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enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

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