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.
1. According to Figure 1, at a pH of 6, which types of enzymes have a relative activity of less than 40% ?
Your Answer is
Correct Answer is D
Explanation
In Figure 1, find the intersection point where the horizontal axis is 6 and the vertical axis is 40%. Choose D