Find the independent variable

Determine which variable is the independent variable–the variable that was controlled by the researchers? Is the independent variable on the x-axis or the y-axis?

Which variable is the independent variable–the variable that was controlled by the researchers? Is the independent variable on the x-axis or the y-axis?

	incubation time; on the y-axis
	incubation time; on the x-axis
	concentration of radioactive glucose; on the x-axis
	concentration of radioactive glucose; on the y-axis

Which variable is the dependent variable–the variable that depended on the treatment and was measured by the researchers? Is the dependent variable on the x-axis or the y-axis?

	concentration of radioactive glucose; on the x-axis
	incubation time; on the y-axis
	concentration of radioactive glucose; on the y-axis
	incubation time; on the x-axis

Part CWhat do the red dots represent?

What do the red dots represent?

	the red blood cell count of a 15-day-old guinea pig after different incubation times
	the concentration of radioactive glucose found in a 1-month-old guinea pig’s red blood cells after different incubation times
	the concentration of radioactive glucose found in a 15-day-old guinea pig’s red blood cells after different incubation times
	the red blood cell count of a 1-month-old guinea pig after different incubation time

Part DWhat do the blue dots represent?

What do the blue dots represent?

	the red blood cell count of a 1-month-old guinea pig after different incubation times
	the concentration of radioactive glucose found in a 1-month-old guinea pig’s red blood cells after different incubation times
	the red blood cell count of a 15-day-old guinea pig after different incubation times
	the concentration of radioactive glucose found in a 15-day-old guinea pig’s red blood cells after different incubation times

Part E – Reading the graphWhat concentration of radioactive glucose did the researchers find in the red blood cells of a 15-day-old guinea pig after an incubation time of 30 minutes?

What concentration of radioactive glucose did the researchers find in the red blood cells of a 15-day-old guinea pig after an incubation time of 30 minutes?

	40 mM
	70 mM
	85 mM
	100 mM

Part F – Interpreting the graphIdentify the trend common to both the 15-day-old and 1-month-old guinea pigs’ red blood cells.

Identify the trend common to both the 15-day-old and 1-month-old guinea pigs’ red blood cells.

	Both took up approximately the same amount of glucose over the course of the experiment.
	Both experienced a dropoff of glucose levels near the end of the experiment.
	Both took up the most glucose during the last incubation interval, from 45 minutes to 60 minutes.
	Both experienced the most rapid uptake of glucose at the beginning of the experiment.

Part GWhat is the main difference between the trends for the 15-day-old and 1-month-old guinea pigs’ red blood cells?

What is the main difference between the trends for the 15-day-old and 1-month-old guinea pigs’ red blood cells?

	The older guinea pig’s cells took up glucose more rapidly than the younger guinea pig’s cells.
	The younger guinea pig’s cells took up more glucose than the older guinea pig’s cells at all incubation times.
	The older guinea pig’s cells took up glucose at the same rate over the course of the experiment.
	The younger guinea pig’s cells took up glucose at the same rate over the course of the experiment.

Part H – Evaluating hypothesesWhich of the following hypotheses is a reasonable explanation for the data represented in the graph?

Which of the following hypotheses is a reasonable explanation for the data represented in the graph?

	The red blood cells of older guinea pigs have no glucose transporter proteins.
	The red blood cells of the older guinea pig were incubated in a less concentrated glucose solution than the red blood cells of the younger guinea pig.
	The red blood cells of younger guinea pigs are completely permeable to glucose and don’t require glucose transporter proteins.
	The red blood cells of older guinea pigs have fewer glucose transporter proteins than the red blood cells of younger guinea pigs.

Solution

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