Multiple choice

Which of the following enzymes act efficiently at pH two?

  1. trypsin

  2. pepsin

  3. ptyalin

  4. all of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pepsin acts within the stomach so its optimum pH is around 2, an acidic pH. When the enzyme enters the duodenum, it comes in contact with a higher pH and its enzyme activity comes to and end. 

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