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.

3. Based on Table 1 and Figure 1, the type of enzyme that catalyzes the breakdown of triglyceride has a relative activity of approximately 50% at which of the following pH values?

Answer and Explanation

Your Answer is

Correct Answer is C

Explanation

It can be seen from Table 1 that the enzyme of break down triglyceride is Lipase; corresponding to 50% of the vertical axis of Figure 1, the pH is equal to 7.5 or 9, which is consistent with C