Question

Anjuli performed an experiment to determine the respiration rate of yeast. She determined this by measuring the amount of carbon dioxide (CO2) that was produced. Then, she created the following graph. mc017-1.jpg Her teacher suggested that she redraw her graph as a line graph. Why should she redraw the graph? A line graph looks better in a scientific report. She was measuring a rate of change. She had graphed the wrong relationship. Her experiment had many different variables.

Answer 1

The right answer is She was measuring a rate of change.

Yeasts use respiration in an aerobic environment (presence of oxygen). This metabolism is used to produce molecules of ATP (adenosine triphosphate), a source of energy in the cell. Cellular respiration takes place in 3 main stages: glycolysis, Krebs cycle and the electron transport chain, linked to oxidative phosphorylation.

The balance equation of cellular respiration is:

6 O2 + C6H12O6 ==> 6 H2O + 36 ATP + 6 CO2

The rate of change makes it possible to study, as a percentage, the evolution of the value of a variable over a given period. For that, it is necessary to calculate the absolute variation, that is to say to make the difference between the value of arrival and the starting value, that one divides by the starting value, the whole multiplied by 100.

Answer 2

She was measuring a rate of change is probably the correct answer once the graph is not shown.

A rate of change in this case would refer to the speed at which the respiration is happening over the measured period of time. Graphically, is the slope of a line and that is why is easier to gather conclusions from a line graph instead of any other type.