Which enzyme works at an optimum pH of about 2?
- A. Salivary amylase
- B. Pepsin
- C. Trypsin
- D. Catalase
Explanation
Pepsin is secreted into the stomach where hydrochloric acid keeps the pH near 2, and its structure is stable and active in exactly those conditions. Trypsin works in the small intestine at about pH 8, salivary amylase near neutral, and catalase around pH 7. An enzyme moved far from its optimum pH loses activity because the charges on the R groups in the active site change.
Related questions
Above its optimum temperature the rate of an enzyme catalysed reaction falls sharply because the enzyme
At a constant enzyme concentration, increasing substrate concentration eventually stops increasing the reaction rate because
Between 0 degrees Celsius and the optimum, a rise of 10 degrees roughly doubles the rate of an enzyme catalysed reaction because
The optimum temperature of most human enzymes is about
A change in pH away from the optimum reduces enzyme activity because it