10 free IB Biology practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
IB Biology Practice Test 2Tutor mode
Question 1 of 10
Interaction and interdependence
A solution of amylase was held at 80 °C for 10 minutes and then cooled to its optimum temperature of 37 °C. When starch was added, no hydrolysis occurred. What is the best explanation?