SAT Subject Biology Practice Question 412: Answer and Explanation
2. Because some fruits contain enzymes that act as proteases, various fruit extracts were tested for use as possible meat tenderizers. The extracts were tested over a range of pH values. Below is a graph of relative effectiveness (compared to distilled water) vs. pH.
Which fruit extract is most effective at a neutral pH?
Correct Answer: D
D Pineapple is maximally effective at pH 7, which is a neutral pH. pHs from 0 to 7 are acidic, and pHs from 7 to 14 are basic, or alkaline.