HSA 2008 Biology Item 3
- CID
- CID539f02a3d2ae73d53857f128edf0588d
- itemNum
- 3
- initialLetter
- itemType
- BCR
- itemAnswerKey
- N/A
- itemMaxScorePoints
- 4
- origNum
- 3
A group of students wants to determine whether a gas is released when glucose is added to a solution of living yeast cells and water. Their experimental setup is shown below.
The students add glucose to a mixture of yeast and water in Flask A. If a gas is released, the test solution in Flask B will turn yellow. The students observe and record the appearance of Flask B at the beginning of the experiment, and again after 24 hours.
- Explain the importance of using a control in the experiment.
- Describe a control for this experiment. Be sure to include the specific parts of the setup.
- Compare the control to the original experimental setup.
Write your answer in your Answer Book.