Which buffer pH was used in the amylase activity tubes?

Which buffer pH was used in the amylase activity tubes?

• A. pH 6.0
• B. pH 5.0
• C. pH 7.0
• D. pH 8.0

Answer: (C)

Enzyme activity depends on pH because the ionization state of amino acids in the active site and the overall enzyme structure must be just right for catalysis. Amylase works best in near-neutral conditions, similar to saliva, where the charged groups in the active site are in the proper state to bind starch and accelerate the reaction. A buffer at pH around 7.0 maintains that favorable environment, so the catalytic interactions proceed efficiently. If the pH is lowered toward acidic values (like 5.0–6.0), essential groups become overly protonated and the active site can lose its shape or charge balance, slowing the reaction. If the pH is raised toward basic values (like 8.0), important groups may become deprotonated in a way that also hinders catalysis. Hence, pH 7.0 provides the optimal conditions for amylase activity in these tubes.

Enzyme activity depends on pH because the ionization state of amino acids in the active site and the overall enzyme structure must be just right for catalysis. Amylase works best in near-neutral conditions, similar to saliva, where the charged groups in the active site are in the proper state to bind starch and accelerate the reaction. A buffer at pH around 7.0 maintains that favorable environment, so the catalytic interactions proceed efficiently. If the pH is lowered toward acidic values (like 5.0–6.0), essential groups become overly protonated and the active site can lose its shape or charge balance, slowing the reaction. If the pH is raised toward basic values (like 8.0), important groups may become deprotonated in a way that also hinders catalysis. Hence, pH 7.0 provides the optimal conditions for amylase activity in these tubes.