10 free GED practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
GED Practice Test 5Tutor mode
Question 1 of 10
Science
A student measured how fast a digestive enzyme broke down its substrate at seven temperatures. All other conditions, including pH and the amounts of enzyme and substrate, were kept the same.
According to the graph, at which temperature did the enzyme work fastest?