Question

1. researchers in a lab performed an experiment to evaluate the function of an enzyme mixture. the graph shows the results.

part a: circle a word or phrase in each set of options to correctly describe the variables in this experiment.
the independent variable is the ( type of enzyme / relative activity / temperature ), and the dependent variable is the ( type of enzyme / relative activity / temperature ).
part b: in additional experimental trials, the researchers gathered more data about the function of the enzyme mixture. the graph below summarizes their results.
circle a word or phrase in each set of options to best explain these data.
at higher temperatures, the enzyme functions most efficiently when ph is ( higher / lower ), and at lower temperatures, the enzyme can tolerate ( higher / lower ) ph values.

Explanation:

Step1: Identify independent and dependent variables in part A

The independent variable is what is being changed, which is temperature. The dependent variable is what is being measured, which is relative activity.

Step2: Analyze enzyme - pH relationship in part B

Looking at the graph in part B, the enzyme has higher relative activity at lower pH values around 5.0 - 5.5 for all temperatures. Also, as the temperature increases (from 45°C to 65°C), the enzyme can tolerate lower pH values for higher activity.

Answer:

Part A: The independent variable is the temperature, and the dependent variable is the relative activity.
Part B: At higher temperatures, the enzyme functions most efficiently when pH is lower, and at lower temperatures, the enzyme can tolerate higher pH values.