The activity of ptyalin is likely to decrease with an increase in concentration of

Assessment: JAMB UTME - Biology - 1994 Subject: Biology

Question 1 Report

The activity of ptyalin is likely to decrease with an increase in concentration of
Answer Details
Ptyalin is an enzyme found in saliva that helps break down starch into simple sugars. An increase in the concentration of acid is likely to decrease the activity of ptyalin. This is because ptyalin functions optimally in a slightly alkaline environment (pH 6.7-7.0). An increase in acid concentration in the mouth can lower the pH, making the environment more acidic, and disrupting the enzyme's function. This is why sour or acidic foods can sometimes impair the breakdown of starch in the mouth.
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