Question

a student measured the time required for a protein sample to be completely digested in the presence of an enzyme under different ph levels. at which ph are all three of the enzymes below the least effective? salivary amylase pepsin arginase enzyme activity acidic ph basic a 2 b 5 c 7 d 10

Explanation:

Step1: Identify enzyme optima

Salivary amylase (neutral pH ~7), Pepsin (acidic pH ~2), Arginase (basic pH ~10).

Step2: Analyze activity at options

• pH 2: Pepsin active (high), others low.
• pH 5: All three enzymes away from optima (low activity).
• pH 7: Amylase active (high), others low.
• pH 10: Arginase active (high), others low.

Answer:

b. 5