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In an investigation into fermentation, yeast was grown in a flask of glucose solution for 20 hours at 20°C - Scottish Highers Biology - Question 7
Question 7
In an investigation into fermentation, yeast was grown in a flask of glucose solution for 20 hours at 20°C. The graph shows the concentrations of ethanol and glucos... show full transcript
Worked Solution & Example Answer:In an investigation into fermentation, yeast was grown in a flask of glucose solution for 20 hours at 20°C - Scottish Highers Biology - Question 7
Step 1
What was the glucose concentration when the ethanol concentration was 3-3 grams per litre?
Answer
To determine the glucose concentration when the ethanol concentration is at 3.3 grams per litre, we can analyze the graph provided.
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Identify the ethanol concentration of interest: We are looking for the point where ethanol concentration equals 3.3 grams per litre.
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Locate this point on the graph: From the graph, trace horizontally from 3.3 grams per litre on the y-axis to where it intersects with the ethanol curve.
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Drop down to find glucose concentration: From the intersection point, drop vertically down to the x-axis to determine the corresponding glucose concentration.
Upon analyzing the graph, the glucose concentration at this ethanol level is found to be between 2 and 4 grams per litre, specifically around 2.4 grams per litre.
Thus, the correct answer is C: 2-4 grams per litre.