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22.6 Designing an investigation of alcoholic fermentation in yeast
Watch the video and then answer the following questions.
Directions:
Questions 1 to 3 refer to the diagram below, which show the apparatus set up by a student to investigate alcoholic fermentation in yeast.
1. Which of the following modifications is needed in order for the apparatus to work properly?
A. Wrap cotton wool around the flask.
B. Pull tube X so that it is above the layer of paraffin oil.
C. Immerse tube Y into the hydrogencarbonate indicator solution.
D. Add a layer of paraffin oil on top of the hydrogencarbonate indicator solution.
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