Gram positive did not grow. The jaw length of a deer was 6. In comparison to the deer and coyote skull, the human was an outcast. Second, lab reports are easily adapted to become papers for peer-reviewed publication. Why are you doing this experiment? The lab manual may dictate where it should appear. Describe what additional research might resolve contradictions or explain exceptions. It was supposed to be increasing.
As well as using the quadrant method to further isolate the colonies, a sample was taken from the best colony on the original streak and gram stained. Graphical analysis lead to a less precise but equivalent estimate of 3. Graphs are especially useful for examining possible trends over the range of measurements. The premolars had a linear pattern between the three animals. Different tooth types in deer, coyote, and human compared by tooth width cm. Usually, three or four experiments will suffice to put the results beyond reasonable doubt. Conducting tests and experiments is fun and all but doing the write-up is one of the most challenging and boring parts of the assignment.
The slope of the best fit line is 3. Taking the calculated number of tooth width and dividing it by the matching jaw length found relative tooth width Figure 3. Based on the observations in this lab, protists are very small yet highly complex. It can be stated as a question. Hypothesis: A soccer ball will fall to the floor when rolled off of a table with a surface 4 feet high,. The milk agar was incubated at 37 degrees Celsius for 48 hours. The methods that were previously studied and practiced in the Microbiology laboratory class were applied in order to identity two unknown bacterium.
It is designed to give practice taking measurements, analyzing data, and drawing inferences without requiring any special knowledge about physics. Introduction This section tells the reader why you did the experiment. The result of the tests for Gram positive led to the identification of Staphylococcus aureus. The first titration was the lightest in color of the three titrations and the second titration was the darkest. This motion was very clear under the light microscope, but interactions of protists with others in the culture jar were better observed using the dissection scope.
Its movement is slow, and changing directions is just a matter of extending a pseudopod in a new direction. The Amoeba moves by extending part of its cell. Formalized hypotheses contain two variables. They thrive on moisture and can be found on moist soil and in fresh and marine bodies of water. Since it can undergo photosynthesis, Euglena is able to make its own food just like plants. After observation there was a clear positive result, which showed the bacteria produced casease.
There was a direct relationship between premolars one and two Figure 1. With the help of these and other cellular structures, protists may feed, grow, and reproduce. These toxins have proteins that activate antibodies which causes resistance. Data include observations in addition to numerical measurements. The human skull was very different in bone structure and longer in height than the deer and coyote skulls. Tables 1 and 2 lists the tests, purposes, reagents used and the results of each test. The tooth width from the deer, coyote, and human had a wide range in variety Figure 1.
To avoid the spread and contamination of P. Ask your instructor before doing this to make sure it is okay. Of the three, Euglena was the only one that had chloroplasts, an organelle common in plants. A lab write up is a report explaining a scientific experiment and its results. The only gram negative bacteria that shows a positive result on the Casein Test is Pseudomonas aeruginosa, therefore correctly confirming the unknown gram negative bacteria. The circumference measurement was obtained by tightly wrapping a small piece of paper around the object, marking the circumference on the paper with a pencil, and measuring this distance with the ruler or caliper. If leaf color change is related to temperature , then exposing plants to low temperatures will result in changes in leaf color.
It is just an exercise or demonstration of what is already known. Make sure to include all of the materials used. After observation, a sample was taken from the isolated colony on the streak plate and another streak plate was done with that, trying to further isolate the colonies. By looking at Figure 3, this can be determined. Sometimes, the instructor will give you the purpose of the experiment. A negative urea test was performed, which also narrowed it down to the same two bacteria. Human errors ex: spilling liquid, not measuring properly do not count.