Some existing knowledge is that when all of the solutions are mixed together in the test tube they will separate into three layers one consisting of the strawberry puree (lysis solution), another is the DNA precipitate, and the last is the actual DNA. (“How to Extract DNA from Strawberries”). The prediction is that the DNA will look like twisted strands of string when looked at under a microscope. Materials and Methods There were many steps taken to perform this experiment. The materials used were: * Strawberry * Plastic Bag * Cell Lysis Solution * DNA Precipitate Solution (Cold) * Test Tubes * Graduated Cups and Cylinder * Funnel * Coffee Filter * Wood Splint * Slide and Coverslip * Microscope The Plastic bags were filled with strawberries.
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.
Exploring enzymes through Lactex. Problem: Does pH affect the results of Lactex? Independent Variable: pH value Dependent Variable: Glucose Control: Lactex enzyme Hypothesis: I think pH will cause the result of Lactex to change. Materials: · Soap (basic) · Antacid (basic) · Soda (acidic) · Vinegar (acidic) · pH test strips · eye dropper · Cow’s milk Experimental Design: 1. Set up plastic cups 2.
Extracting DNA from Strawberries Honors 1. Why is the ethanol use in this lab? Explain its importance and the significance of it being “ice cold”? 5 points The coldness stops the DNA strands from breaking apart. The DNA strands are held together by hydrogen bonds.
Fay Chambers Unit 4223-008 Causes and spread of infection Bacteria are single celled organisms; they are among the most successful life forms on Earth and can survive in all habitats. Some bacteria are good for us. ‘Friendly’ bacteria for example help us to digest food, whilst other forms of bacteria can cause serious illness. The kinds of bacteria that cause infection are called pathogenic bacteria. Many bacterial infections can be treated with antibiotics although some strains are now becoming resistant.
Disease Yersinia pestis The Plague Jesus Urquijo Biology 113 Lab March 18, 2013 Microbes are what make the world what it is today. They are found in nearly every environment on earth. Each species has its own way of getting nutrients and adapting to its environment, such as pH, aerobic and anaerobic conditions, and enzymes that are essential for optimum living. The majority of bacteria living on earth are harmless if not beneficial to the human race, but those few microbes that are harmful to humans are those that cause disease. They are referred to as pathogens and need to be observed so we can prevent the spreading of disease caused by those particular microbes.
In the short article “Why evolution should be taught in public schools” by Laura H. Kahn, author states that in order to understand true science knowledge children in schools should be taught evolution of plants, animals and humans. In the beginning of her passage she gives example of previous science case that had to go through many struggles before it was accepted and approved. “In the nineteenth century, the prevailing dogma was "spontaneous generation." It did nothing to prepare scientists and physicians to develop effective strategies against the infectious diseases that were killing untold numbers of people. Louis Pasteur, the French chemist who developed the rabies vaccine, was instrumental in disproving spontaneous generation and replacing it with the germ theory of disease.
Experiment-Specific Questions Experiment 1: Monosaccharide Test Fill in the table below with the results from the monosaccharide test experiment, and your conclusions based on those results. Results Monosaccharide Test Solution Initial Color Color with Benedict's Solution Color After Heating Monosaccharide? glucose solution water sucrose solution fructose solution Benedict’s solution is added to white grape juice and heated. The color changes from blue to orange. Based on this result, what biological molecules are present in the white grape juice?
In mutualism both species benefit; in commensalism one species benefits and the other is not affected; and in parasitism the parasite benefits and harms the host. 2. Prokaryotes engage in all three types of symbiosis with eukaryotes, e.g., Rhizobium is mutualistic with plants, bacteria living within the intestines and on the skin of humans are mostly commensal but some are mutualistic, e.g., anaerobic, fermenting, bacteria living within the female vagina create an acidic environment hostile to yeast and other fungi. C. Pathogenic prokaryotes cause many human diseases 1. To be pathogenic, a parasite must invade the host, resist internal defenses long enough to begin growing, then harm the host in some way.
It is stated on www.biologyinfo.com that, “Not all bacteria are harmful. In fact, less than 1 percent cause disease, and some bacteria that live in your body are actually good for you”. However there are some bad bacteria which cause diseases such as, MRSA, strep throat, tuberculosis, anthrax and urinary tract infections. Viruses are a great deal smaller than bacteria. They are contained in a protein coating which makes them more difficult to destroy.