Question 16
Food Substances and EnzymesThe activity of ptyalin is likely to decrease with an increase in the concentration of
- A.oxygen
- B.starch
- C.protein
- D.acid.
Show the answer and explanation
Answer: D (acid.)
Explanation
Ptyalin (salivary amylase) works best in neutral or slightly alkaline conditions; acid slows it down, which is why it stops working in the stomach.