biology homework
Photosynthesis and Cellular Respiration in Algae Beads Results Page
Name: Date:
PART A: Data Collection (25 points)
1. Record class absorbance readings of both the light treatment and dark treatment.
Light Treatment
| Absorbance 550 nm | 5 min | 10 min | 15 min | 20 min | 25 min | 30 min |
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| Group 2 | ||||||
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| Group 4 | ||||||
| Group 5 | ||||||
| Group 6 | ||||||
| Average |
Dark Treatment
| Absorbance 550 nm | 5 min | 10 min | 15 min | 20 min | 25 min | 30 min |
| Group 1 | ||||||
| Group 2 | ||||||
| Group 3 | ||||||
| Group 4 | ||||||
| Group 5 | ||||||
| Group 6 | ||||||
| Average |
PART B: Questions (25 points)
1. Scientists measure the rates of biochemical processes by monitoring either substrate depletion or product generation. Considering this, how might you monitor the rate of photosynthesis? Of cellular respiration?
2. What type of organism would you need to use to be able to monitor BOTH photosynthesis and cellular respiration? Why are eukaryotic algal cells in the Photosynthesis and Cellular Respiration Lab a good choice?
3. As the algae photosynthesize, how will the pH of the CO2 indicator change? Why? How will the pH change if the cells begin to respire?
PART C: Scientific Writing –CREATE A FIGURE AND DISCUSSION SECTION (50 points)
Refer to the Template and Guidelines for Writing a Formal Lab Report. This section must be typed and attached to the Lab Results Page.
Graph the class averages for the light treatment and the dark treatment separately. Be sure to include the following:
Use either Excel if your computer uses Windows, or Pages/Numbers if your computer uses Mac operating systems, to create a line graph of the absorbance data. Correctly label the x-axis and y-axis.
Write a figure legend for the Reaction Time chart. The figure legend provides a brief explanation for what the chart represents.
Construct a well written paragraph that would be part of your DISCUSSION interpreting or analyzing the data presented in the graphs above.
Hint for analyzing graphs: When the CO2 levels increase, it changes to yellow (more neutral; lower absorbance), and when CO2 levels decrease, it changes to purple (more basic; higher absorbance).
