Figure 1. Firing Rate of Tonic Receptor in Response to Stretch. The correlation between Firing Rate and Stretch of the slow adapting crayfish receptor for four different sets of data is represented in this figure. The recordings are taken at stretches of 2, 4, 6, 8, and 10 mm of the crayfish tail. The best fit lines for the different sets of data are as follows: Ali and Emily- Linear best fit line, Dave and Laura- Exponential best fit line, Jimmy and Amina-Exponential best fit line, Tala and Jen-Linear best fit line).…
The purpose of this study is to understand the feeding rate of Daphnia magna. D. magna is a species of Daphnia that belongs to the suborder Cladocera (Ebert, 2005). They live in freshwater and feed on small, suspended particles in the water. They are filter feeders. Phyllopods, which are leaf-like appendages, provide a filtering apparatus for the collection of food. These structures beat to produce a constant current of water, allowing particles to be filtered by fine setae on the thoracic legs. The particles are then transferred to their mouth groove to be ingested. D. magna typically feed on planktonic algae (Ebert, 2005). The following experiment uses algae to test what affects the feeding rate of D. magna. The rate of filtration is dependent on multiple factors including temperature, food density, body size, and water pH.…
Daphnia, also known as the water flea are planktonic crustaceans that are found in lakes, ponds, and streams. They received “their common name from their jerky movement through the water” (Clare). They are also “very small, usually 2-5mm long, with an overall shape similar to a kidney bean” (Elenbaas). Daphnia play an important role in the freshwater food chains and serve as food for other freshwater organisms such as fish. They are also commonly used to test for chemical toxicity in water. Since Daphnia have transparent body, it is easier to observe their heart rates, and other visceral organ systems. Its small heart rate is easily visible when viewed under a microscope. A change in its heart rate plays a crucial role in determining whether…
Distilled Water – used as the main thing in the concentrations and also used to put the Daphnia in after they were subjected to the alcohol concentration to try and bring their heart rate back to normal. It is used as the control as it is pure and free from chemicals that could affect the Daphnia’s heart rate, thus making the test fairer.…
Daphnia culture, medicine dropper, slides, cover slips, bristles or threads, paper and pencil, paper towels, aquarium water, "recovery" beaker, dropper bottles containing adrenalin in various concentrations, microscope.…
The overall goal of experiment four was to determine the identity of unknown cations presented to the student. But in order to know the identity of these unknowns, in part 1, Ag+, Pb+, and Hg22+ were presented to the student in aqueous solutions and then precipitated through experimentation. In part 2, the same procedure was enacted to determine which substances precipitated through qualitative analysis. Solubility rules were also a major theme as solubility is important in determining whether a reaction will produce a precipitate.…
|Light Condition |Final pH |Water Movement (GROUP |Water Movement (CLASS |Photosynthesis Rate |Photosynthesis Rate |…
Daphnia magna is a freshwater ectothermic crustacean commonly referred to as a water flea. Its body is transparent. Because of its…
( -- First discuss our results from the samples: the particular Daphnia specimens that we used.)…
The number of electrons forming a charge cloud around the nucleus is (pick one of the following) greater than; equal to; smaller than the number of protons in the nucleus of the atom.…
pH (three and five) and a strong acid (twelve) the survival rate of the Daphnia…
In the article “How Boys Become Men”, written by John Katz, he analyzes situations he experienced while growing up. Katz believes that boys become men by not showing fear or feelings and not ratting on others. As in the novel, The Other Wes Moore, both Weses are forced to become men at an early age. They experience events that push them to make decisions that make them grow and think like men do. Katz details the maturation process for boys, as the book, The Other Wes Moore, does with both Weses. They make decisions and take actions to mature and become a men.…
Daphnia Magna have a single compound eye, two branched antennae, and they look almost kidney-shaped. They also have a carapace, which is the upper section of the water flea’s external shell. The water flea has leaf-like limbs, in which they produce a current of water and filter food and oxygen to the mouth and its gills. According to some of my research, talking to my father, the Daphnia has a relatively low percentage of body fat; this may affect them the most when surrounded by alcohol.…
The object of this experiment is to determine how changing the size of the beak of a finch will affect the population as well as the growth rate of the finch’s beak. The reason for the experiment is to evaluate evolution and how it affects the finch’s population, and how natural selection is always present in life. In this experiment I will show that the finch will continue to evolve until its beak has reached the optimal size for sustaining life, when changing the beak size to a much larger size we will see that the finch will have no need for further evolution of its beak and that its population will become much more stable and consistent throughout the years.…
In unit 7.3 the experiment tested the ability of lactase to specifically bind and interact with lactose compared to maltose. In unit 7.4 the experiment tested the role, if any, that metal ions have on the activity of lactase. My hypothesis for unit 7.3 was knowing that lactase is specific for lactose, lactose will separate into galactose and glucose, as maltose will not change (153-155). Lactase should like lactose. For unit 7.4 my hypothesis was that EDTA will remove the ions, and will not work.…