A researcher thinks she has developed a vaccine for th e ebola virus and decides
ID: 203962 • Letter: A
Question
A researcher thinks she has developed a vaccine for th e ebola virus and decides to test their solution on lab rats. She put 15 unvaccinated rats and 15 vaccinated rats in an enclosure containing 20 mg of viral material per liter air for 24 hours. After the 24 hours, she carefully removes the rats and takes blood samples from each to measure the amount of virus infected cells in each. Based on the information, please write an appropriate hypothesis and prediction for this experiment. (6 pts) What is the independent variable? What is the dependent variable? (2 pts) (2 pts) Please identify one variable that was controlled in this study? (2 pts) Sketch a graph demonstrating your prediction for this experiment. Include appropriate axis and group labels. (5 pts) ic magnification and resolution? (3 pts)Explanation / Answer
Hypothesis- Vaccines for ebola virus will produce immunity in mice.
Theory-- Vaccines are dead ir weakened germs of a particular disease. When injected into a healthy body, the germs trigger the immune system to produce specific antibodies targetting these germs. These antibodies remain in the blood and they " remember" the target germs . Hence, when there is an actual attack of those germs, the body is already equipped to fight them and the germs are not able to infect . In other words, the body develops immunity against that particular disease for which the vaccine was given .
Possible Outcomes -- We assume that the researcher has successfully developed the vaccine for ebola virus. So, after her experiment , when she removes the rats and takes blood samples from each to measure the amount of virus infected cells , she will observe the following--
* the 15 unvaccinated rats show cells infected by the virus
* the 15 vaccinated rats do not have cells infected by the virus. They show the presence of a large number of antibodies in their blood.
The Independent variable is the time i.e the duration of exposure to the virus particles for the two groups of rats. In this case, it is 24 hrs.
The Dependent variable is the two groups of rats- one vaccinated lot and the other unvaccinated lot.
The Controlled variable was the amount of virus particles to which the rats were exposed i.e 20 mg of viral material per liter air, for this experiment.
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