Dinoflagellate Pyrocystis Osmosis Experiment

To perform this test, a tube of broth rich with glucose is acquired. In this tube is phenol red, a pH indicator. Initially, the tube appeared pink in color, indicating a normal pH level. Next, a sample of unknown #44 is introduced into this medium using the aseptic technique, and this is allowed to sit for several days. If the organism is able to ferment glucose, the pH in the medium would decrease and cause the phenol red to exhibit a yellow color. In addition to the straw color, gas can also be produced and trapped inside the Durham tube placed in the medium. This production of acid and gas is a direct result of the fermentation of glucose, as seen with unknown

2.  Develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water.

Based on the results of your experiment, would you reject or accept the hypothesis that you produced in question 1? Explain how you determined this.

Develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water.

2. Develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water.

The containers were plastic and 18 by 15 by 6 centimeters long. Prior to the experiment being performed, the crickets had spent a week in these residencies. Along with the crickets in the plastic containers, there was wet pieces of paper towel and a slice of carrot.

2. This experiment is not able to support Matthew's hypothesis. Suggest specific improvements that will allow the experiment to more effectively test the given hypothesis. Explain why these changes are improvements.

17. Look at Figure 1.24. Use it to write a hypothesis using the “If . . . then . . .” format.

The allure of precious metals and the shimmer of precious stones versus the blandness of the essential concepts of life: food, water and shelter, can be a difficult choice for some people. The hypothetical line between what is a need versus a want splits society tenfold, and is a major problem in world civilization today. The choices humans make on a daily basis determine the futures of thousands, so what are the choices in life that are driven by needs and wants? The choices that define needs and wants are greed, the desire to pursue wealth, and the desire to protect one’s self.

The null hypothesis will be that the test tubes with an increase in temperature, pH values, enzyme concentrations, and substrate concentration will have a very small color change or no color change at all. The alternate hypothesis is that the test tubes containing an increase in temperature, pH values, enzyme concentrations, and substrate concentration will all have an intense color change; the more the change, the more intense the color change will be.

To find the effect of temperature on the activity of an enzyme, the experiment deals with the steps as follows. First, 3 mL if pH 7 phosphate buffer was used to fill three different test tubes that were labeled 10, 24, and 50. These three test tubes were set in three different temperature settings. The first test tube was placed in an ice-water bath for ten minutes until it reached a temperature of 2° C or less. The second tube’s temperature setting was at room temperature until a temperature of 21°C was reached. The third tube was placed in a beaker of warm-water until the contents of the beaker reached a temperature setting of 60° C. There were four more test tubes that were included in the procedure. Two of the test tubes contained potato juice were one was put in ice and the other was placed in warm-water. The other two test tubes contained catechol. One test tube was put in ice and the other in warm water. After

There were three test tubes in which the experiment was held. A relatively equal sized portion of raw potato (this contained the enzyme [a biological catalyst] hydrogen peroxidase) was placed in each tube. Then, enough water to cover the potato was added. Proceeding this, each of the test tubes were assigned a temperature; cold, room temperature or warm (this was written on the tag so that they were not confused). The test tube destinated ‘cold’ was placed in a ice bath for five minutes. At the same time, the ‘hot’ test tube was placed in a hot water bath for five minutes. Meanwhile, the room temperature test tube sat at room temperature for five minutes. When the five minutes were over, the test tubes were returned to the rack (so that they were able to be observed). Then, the test tubes were allowed to sit at room temperature for five more minutes. Once that period of time was over, 2 ml of hydrogen peroxide (the substrate) was added to each tube.

The experiment that the class worked on was about peroxidase. Peroxidase is part of the enzyme group that presents most living organisms (Ahmed, 2013). Peroxidase interferes with the removal of hydrogen peroxide (Ahmed, 2013). Hydrogen peroxide is a toxic product that have normal metabolism before it causes any cell damages (Ahmed, 2013). Peroxidase has two substrate and both of them must present a reaction (Ahmed, 2013). One of the two substrate is H2O2 and other one just depends on the organism or the cell type (Ahmed, 2013). The substrate that the class uses is turnip extract. In the class there were five experiments to do but the class were assigned into groups and each group were going to do two experiment. The names of the experiments are: Baseline, Temperature, and pH.

Throughout Buchholz’s article, he explained an experiment that he conducted using the scientific method. Buchholz’s article is organized in the order that the scientific method occurs to ensure that his results are valid results. Before beginning the experiment, he asked a question; “Should infected females be more or less choosy?” (Buchholz). After proposing the question, Buchholz proposed two alternative hypothesis to his question before beginning his article. In the introduction, Buchholz introduced his experiment by describing the type of parasite that was going to be used to infect his sample group of turkeys. He explained what the parasite was known to do to the body and how the parasite was transmitted and reproduced. After introducing the parasite that was going to be used, Buchholz proposed a null hypothesis that stated, “parasitic infection

The independent variable of this experiment were the different types of the solutions used, while the dependent variable was the mass of the cucumber slices. The constants were, the amount of liquid used and the time the cucumbers were left in the solution. While the control was the cucumber left in the cup with no solution. The students made a hypothesis saying that they believe that the cucumber slices put into the salt solution would decrease in mass while the cucumber put in the distilled water would increase in mass. In the end, the results of the experiment supported the students