SAT Subject Biology Practice Question 412: Answer and Explanation

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Question: 412

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?

A. Lemon
B. Banana
C. Papaya
D. Pineapple
E. Apple

Correct Answer: D

Explanation:

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.

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