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.

6. Based on Table 1 and Figure 1, at a pH of 7, the relative activity for the type of enzyme that catalyzes the breakdown of starch is approximately the same as the relative activity for the types of enzymes that catalyze the breakdown of which of the types of molecules listed below?

I. Nucleic acid
II. Triglyceride
III. Protein

Answer and Explanation

Your Answer is

Correct Answer is H

Explanation

From Figure 1, it can be seen that when PH=7, the intersecting curves include amylase, lipase and protease, corresponding to Table 1, it can be seen that nuclear acid will not be decomposed, so choose H