Loading presentation...

Present Remotely

Send the link below via email or IM


Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.


Yeast and Biofuels

Kailey Schwarzenbacher Lilly O'Brien arrowhead High School 700 North Avenue Hartland, WI 53029

Kailey Schwarzenbacher

on 15 April 2010

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Yeast and Biofuels

Yeast and Biofuels Kailey Schwarzenbacher, Lilly O'Brien
Arrowhead High School
700 North Avenue
Hartland, WI53029 Introduction Methods The very first thing that needs to be done is washing out all of the glassware to be sure that it is clean so your results are as accurate as possible. Then you are going to measure out three mL of distilled water using a pipette. Then add twelve mL of 7% yeast and combine it in a test tube. Put the stopper on the test tube and let the CO2 be collected. Check the amount at 45 min and 55 min and record the data. Do the same for the sucrose, corn meal, corn starch, and corn starch with amylase. We tested how much CO2 was collected. Results The graphs show how much CO2 is being produced when the 7% yeast reacts with corn starch with amylase, corn meal, water, sucrose, and corn starch. It shows readings from 45 min and 55 min. The first graph shows all of the averages. The second graph is of the three trials at 45 min and the three trials at 55 min. As you can see none of the products tested are even close to sucrose. Ignoring the sucrose the best result would be the corn starch with the amylase. Discussion When you look at the results you can tell that nothing compares to sucrose but also that nothing didn't produce anything like the water. The water and the sucrose were the controlls therefore it is not suprising that nothing is the same as water and sucrose. All of the carbohydrates/sugars would work as biofuels but some would work better then others. Some would work better in the fact that we have them avalible to us and some would work better because the fact that they produce more CO2. In this lab the independent variable would be the fuel source that was chose to be fed to the yeast. As a result, the amount of carbon dioxide generated is reflective of how well the yeast did or could metabolize the sugar. A monosaccharide is a simple sugar, a polysaccharide is a chain conecting disaccharides and monosaccharides, and a disaccharide is two monosaccharides linked together (Diwan, 2008). This could also relate to the way the yeast reacts with the biofuel showing us weather it would work or not. Analysis From the results you can see that none of the things tested would be a good biofuel if you compare it with the sucrose. If you were comparing it to water then you would see that all of them would be a better biofuel then the water which is the negative control. The corn starch with amylase had the best results because amylase is an enzyme that breaks down starch and converts it into usable sugar (Brady, 2010). Sugar is the best result for a biofuel because sucrose is sugar and as the results show sucrose worked the best. Corn meal would be the worst to use and corn starch with amylase would be the best. Corn meal did not work well because it is dried corn. I think the reason why these didn't work so well is because they do not have as much sugar as sucrose because sucrose is sugar. I think that many of the reactions that took place were very temperature dependent.

To make a better biofuel by using something from Wisconsin we need to do more research. We need to use something that we have a lot of so it lasts for a long time. A biofuel is basically taking an energy source and turning it into a liquid fuel (Unknown, 2010). The best biofuel is sugar (Unknown). Literature Cited Brady, M. (2010). What is Amylase? Retrieved from http://wisegeek.com/what-is-amylase.htm

Diwan, J. (2008). Carbohydrates-sugars and polysaccharides. Retrived from http://www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb1/part2/sugar.htm

Unknown. (2010, February 2). Biofuels. Retrieved from http://www.nrel.gov/learning/re_biofuels.html Yeast (saccharomyces cerevisae) is a single celled living organism and is apart of the fungi kingdom and apart of the domain, eukaryota. Yeast eats sugars, mainly glucose. If there isn't any glucose, the yeast will eat other sugars like starches and alcohol. For the yeast to be able to eat these it creates an enzyme that will transform these other sugars into glucose so the yeast can eat it.

Anaerobic respiration is respiration that takes place without the presence of oxygen. In anaerobic respiration,glucose produces ethanol, carbon dioxide, and energy. Aerobic respiration is respiration that takes place when oxygen is present. In aerobic respiration, oxygen and glucose come together to form carbon dioxide, water, and energy. Yeast can respirate both aerobically and anaerobically. In this lab, the yeast respirated aerobically at first and then began to respirate anaerobically.

In this experiment, the controls were water, the negative control, and sucrose, the positive control. The controls are always the same and can't be altered once in the lab. A positive control is a control that will have an outcome similar to the outcomes that are expected in the experiment. It works like the other materials being tested. It will be the maximum that the other samples may reach. A negative control is a control that will have an outcome that will be very different to the results of the other materials being tested.

Biofuels are fuels that are made from organic materials. There are tow different types, ethanol and biodiesel. Ethanol is the more popular of the two and is made mostly from strach which can be found in corn. Biodiesel is made from soybean oil. Biofuels are important because some day, our fossil fuel supply will run out and we will need to find an alternate fuel source. A good biofuel would be easy to grow, cheap, and not a food source. If something would qualify under these conditions that it would considered a possible source for biofuel. Biofuels are importatnt to Wisconsin because since Ethanol is the more popular of the two biofuels, Wisconsin would benefit with the increase of corn sales since Wisconsin is an agricultural state. It would also benefit Wisconsin, because we have to import all of our fossil fuels we use because there aren't any in Wisconsin. If we made our own biofuel, it would save the state a lot of money that is used to buy and import fossil fuels. The purpose of this experiment was to come up with the best biofuel out of corn starch, corn meal, water ( negative control), sucrose (positive control), and corn starch with analyses.
Full transcript