BIOLOGY HIGH SCHOOL

Pepsin, a common enzyme found in the stomach, is most active at pH values between 0.5 and 2.5. It works slowly between pH values of 2.6 and 3.4. Beyond a pH of about 3.5, it becomes completely inactive. Why does this happen? A) The enzyme inactivates because it melts into a liquid when it is not at the right pH. B) The protein chain in the enzyme is denatured, permanently inactivating it as the pH approaches 7. C) The enzymes slow down, because changing the pH changes the temperature as well, and affects the reaction.

Answers

Answer 1
Answer: At a pH (or temperature) outside the optimal zone, an enzyme, which is a protein, can denature. This means it is no longer functional, as its shape has changed. This is usually an irreversible damage to the enzyme. So, if the pH in the stomach is too high, the enzyme will denature and inactivate the enzyme. This means that Answer B is correct. Hope this helps! :)
Answer 2
Answer:

Final answer:

Pepsin becomes completely inactive at a pH of about 3.5 because the protein chain in the enzyme is denatured.

Explanation:

The correct answer is B) The protein chain in the enzyme is denatured, permanently inactivating it as the pH approaches 7.

Enzymes are specialized proteins that facilitate chemical reactions in the body. Pepsin, being an enzyme, has an optimal pH range for activity, which is between 0.5 and 2.5 in this case. Pepsin works by breaking down proteins into smaller peptides. However, when the pH increases and approaches 7, the protein chain in pepsin becomes denatured, resulting in a permanent loss of its catalytic function.

Learn more about Enzyme activity here:

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