* The purpose of this lab is to answer the research question: “Does the concentration of sucrose affect the rate of cellular respiration in yeast?” What do you think? * I believe that the concentration of sugar will affect the rate of cellular respiration. The more sugar the faster the rate of cellular respiration. Data Tables | Depth of CO2 bubbles in: | Depth of CO2 bubbles in: | Sucrose Concentration | 10 minutes | 20 minutes | 0% | | | 1% | | | 5% | | | 10% | | | | Balloon description (size and circumference) | Balloon description (size and circumference) | Sucrose Concentration | 10 minutes | 20 minutes | 0% | | | 1% | | | 5% | | | 10% | | | Post-Lab Questions 1. What hypothesis did you use to answer the research question?
Purpose/ objectives: 1. To learn if food concentrations affect yeast activity 2. To improve skills in writing a lab report better 3. To practice measuring skills 4. To understand how yeast works Materials: * * 6 identical large test tubes (18 X 150mm) * 1 graduated cylinder (24ml) * Molasses stock solution ( 1:4- molasses: water) Dropper * Yeast suspension (1 gram of dry yeast in 100 mls water) * Aluminum foil * 1 test tube rack * 1 graduated cylinder (small) * 1 beaker * 6 small test tube (10 X 75mm) * Rule marked in millimeters Hypothesis: If you add more molasses to the yeast then the gas would became greater because the yeast cells reproduce so the waste became greater and
Osmosis/Egg Lab By: Nicole Dressen Problem to Solve: How the mass of an egg changes in different substances. Information Collected: A. Hypotonic: a substance with lower concentration when compared to another substance. B. Isotonic: when the concentration of two substances is the same. C. Hypertonic: a substance with more concentration when compared to another substance. Hypothesis: I think the mass of the egg that is in the water will stay the same but the mass of the egg that is in the sugar will increase mass.
These chambers were to see the yeast cells in a microscopic view and if or if not our hypothesis were true. The materials that were used a compound light microscope, a Pasteur pipette, and a hemacytometer to view the cell count of collected yeast. The methods that were go about was simple, to view the two cultures and compare them both. As a result of the t-s value was .035, as the value was lower than the critical value it’s said it’s being rejected. Thus as our experiment has been rejected our hypothesis comes in a stand still whether antibiotic dose really effect yeast cell cultures.
The hypothesis is that if the American diet continues to promote sugary goods, then it can be expected women’s health can be compromised by an increase in yeast infections. Diets high in sugar can potentially cause reactions in women within 48-72 hours. An alternative to decreasing sugar can be in the introduction of yeast-eating microbes through medication. Material and Methods Material used for the project were the University of Phoenix Materials: Lab Report Outline, Yeast Lab Worksheet, and Yeast Lab Spreadsheet (University of Phoenix, 2014). The steps necessary to complete the experiment started with counting the spores on the worksheet.
Experiment Chromatography Of Food Dyes Abstract This experiment is to determine the presence of a mixture in a substance. Chromatography is used to separate substance in a mixture or separating components from a mixture. Using chromatography with a solvent we are able to separate the different mixtures found in a substance. Chromatography can tell if a sample is pure or if it is made up of several different substances. Experiment & Observation I gathered together my items; distilled water, salt, ruler, scissors, stapler pencil, tape, 16 toothpicks, Kool-Aid drink mix strawberry and grape, set of McCormick food coloring red, yellow, green and blue, small bag of M&M candy, plastic beaker 50 mL, petri dish 60mm, well-plate 24, FDC blue dye #1 0.5 mL vial, FDC blue dye #2 0.5 mL vial FDC red dye #3 0.5 mL vial, FDC red dye #40 0.5 mL vial, FDC yellow dye #5 0.5 mL vial, FDC yellow dye #6 0.5 mL vial, unknown 0.5 mL vial, 3 filter paper chrom 14x7 cm.
So the popcorn will not be able to expand without the water content. The mass water content affects the density of the kernels. According to the above facts, the hypothesis of the experiment was that the brand with higher mass water content and density will be the higher quality. The investigators then carried out an experiment using materials listed below. They carried out the experiment with two different brands of the popcorn.
Therefore the eggs width grew by 30mm and 60mm in length. This evidence supports the hypothesis that: the egg will get bigger when placed in vinegar. The egg grew because the water from the vinegar diffused into the egg. The water concentration in the egg was higher than the water concentration inside the egg yolk and egg white. Water molecules move from where there’s a lot to where there’s a little water concentration which is called osmosis.
Analysis: My conclusion, that the change in enzymes will affect the amount of apple juice produced because each enzyme will work differently with the apple sauce, can be proved with the data from this experiment. It can be proved because when the enzyme was changed different amounts of apple juice were produced. An example of this could be the pectinase and cellulase solutions. When the cellulase was added to the apple sauce it produced only 1 mL of apple juice, but when the pectinase was added to the apple sauce it produced 4.5 mL of apple juice. That is a change of 3.5 mL from one enzyme to another.
* Explain why flowers do not wilt as quickly if they are kept in water after they are cut. * Explain why strawberries begin to glisten with water minutes after having sprinkled some sugar on them. * Both salt and sugar are hygroscopic, meaning salt and sugar molecules will tend to attach themselves to any water in their environment --- removing loose water molecules from the environment. Recall the egg experiment! How would a high concentration of salt or sugar in your blood affect the movement of water molecules across cell membranes?