After reading the paragraph below, answer the questions that follow.
You're the manager of a factory that produces enzyme-washed blue jeans (the enzymes lighten the color of the denim, giving a "faded" appearance). When the most recent batch of fabric came out of the enzyme wash, however, the color wasn't light enough to meet your standards. Your quality control laboratory wants to do some tests to determine why the wash enzymes didn't perform as expected.
Based on your understanding of enzyme structure, which of the following would you recommend that they also investigate?
◦ the primary structure of the enzyme
◦ the manufacturer of the fabric
◦ the temperature of the liquid in the washing vat
◦ how long the fabric has been in storage