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About This Simulation
Help Roxy figure out if a mysterious dark algae is able to do photosynthesis using green light and measure this process with the Hill reaction.
Learning Objectives
- Understand properties of light and why pigments are colorful
- Develop a hypothesis and set up an experiment to test it
- Understand how to measure the redox potential of the electron transport chain
- Interpret absorption spectra
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About This Simulation
Lab Techniques
- Hill reaction
- Spectrophotometry
Related Standards
- No direct alignment
- Supports Biology Unit 2: Cell structure and function
- Biology 2.9 Photosynthesis
Learn More About This Simulation
This short, targeted simulation is adapted from the full-length “Electron Transport Chain” simulation.
Find out if a dark colored algae can help with biofuel production. In this simulation, you will help Roxy, the lead engineer in an environmental project, find out if a dark colored algae can do photosynthesis using green light. Use the Hill reaction and spectrophotometry to measure electron flow and find out if the pigments in the algae can use green light for photosynthesis.
Introduction to the Hill reaction
How can we measure the energy generated by photosynthesis? The process of photosynthesis uses an electron transport chain. By measuring the electron flow using the Hill reaction we can know the energy produced by photosynthesis. This reaction uses DCPIP, a redox dye, to measure the electron flow. Now we know the theory we can start our experiment!
Prepare the experimental controls
Our handy virtual assistant Dr. One has already extracted pigments from the algae for you! Now, to check out if the pigments can use green light for photosynthesis. In order to properly test your hypothesis, you will need to prepare and measure your sample, as well as positive and negative controls. Look at the absorption spectra from previous experiments to choose the correct wavelength of light for the spectrophotometer to measure your samples.
Measure photosynthesis
By comparing the absorbance of your pigment sample exposed to green light only in the spectrophotometer to those of the controls, you will be able to figure out if the dark algae are able to perform photosynthesis using green light or not. Will your hypothesis about the dark algae pigments be correct?
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Related Course Packages
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North Dakota State College of Science
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Lecturer in Human Physiology
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San José State University
"We surveyed over 400 students. More than 90% thought Labster was easy to navigate, and that it was fun, but more importantly, most of them felt confident that they could execute the labs in person. And that confidence is a big deal."
FAQs
Find answers to frequently asked questions.
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