Passage I

Enzymes catalyze (speed up) chemical reactions. The pancreas (a digestive organ) secretes 4 types of digestive enzymes—amylase, nuclease, lipase, and protease. Each type of enzyme catalyzes the breakdown of a different type of molecule in the digestive tract (see Table 1).

An enzyme's activity can be affected by pH. Figure 1 shows, for each type of enzyme listed in Table 1, how relative activity (percent of the greatest measured activity) varies with pH.

4. Suppose that after a certain enzyme is added to a mixture of starch, nucleic acid, triglyceride, and protein, only the concentration of protein decreases. Based on Table 1, the enzyme would most likely be classified as:

Answer and Explanation

Your Answer is

Correct Answer is J

Explanation

According to the meaning of the question, only the protein content decreases, so according to Table 1, we can know that the enzyme is Protease, choose J