Final answer:
Different syringes are used to prevent cross-contamination, maintain purity, and ensure accurate measurements, since hydrogen peroxide can react with biological materials and alter experimental results.
Step-by-step explanation:
A reason for using different syringes for measuring the yeast suspension and the hydrogen peroxide solution is to prevent cross-contamination. Doing so ensures that the purity of each solution is maintained and that the accurate concentrations are used for the experiments, which is vital for obtaining reliable results. Furthermore, hydrogen peroxide is a strong oxidizing agent which can react with biological materials, and any residue left in the syringe could result in unwanted decomposition or affect the measurements of subsequent substances. It also helps to provide accurate and precise dosing, as cross-contamination could alter the volume dispensed by the syringe or interfere with the experiment if catalase or other enzymes present in the yeast affect the breakdown of hydrogen peroxide.