Scientific Method Quiz Science of Life
Science of Life
Your lab is studying an experimental drug that may be able to prevent obesity. You are testing the drug on rats for a preliminary analysis. You have chosen four groups of rats from the laboratory rat–rearing facility, ensuring that they have the same age, history, and other characteristics.
You give three experimental groups the drug, dissolved in saline solution and administered via injection. The first group receives a low dose, and the second, a moderate dose and the third a high dose. You give the fourth group an injection of fluid without the drug. You feed these groups three times a day with an adjusted diet equivalent to a human being’s intake of excessive calories, designed to simulate obesity-inducing food quantities.
You measure the rats’ weights and average the weights per group. You conduct these measurements on a daily basis for thirty days in the early morning before the feedings. The following are the groups and the treatments you give them:
Group A -obesity diet, low drug dose
Group B – obesity diet, moderate drug dose
Group C -obesity diet, high drug dose
Group D – obesity diet, fluid without drug
Which of the groups represents the control group?
If all the rats in group C die, and none die in the other groups, what can be the most logical conclusion?
- The drug dosage is too high, leading to malnutrition, which caused the deaths.
- The drug dosage is too high, and the deaths were caused by the drug interacting with the rats’ internal organs.
- The drug dosage is too high, but the direct mechanism of death needs more investigation
- The rats were stressed by the drug, causing them to eat less.
- none of the above
What is the dependent variable in the experiment?
- The weight of the rats
- The amount of drug given to the rats
- The age of the rats
- The saline solution given to the rats
You are trying to determine whether a coin will give fair result in a coin toss to decide who gets the ball in a football game. A fair coin will have an equal chance of giving a head or a tail for an outcome. You flip the coin 4 times with the following outcome: three heads and one tail. Based on these data you decide not to use it for a coin toss. Is this a valid conclusion?
Correct. Since only four tosses were considered, it is likely that this outcome is just due to random chance and that the coin is actually fair. For a four tosses, you would expect to get an equal number of heads and tails in only 38% of the time.
Which of the following is the least scientific question?
- Which type of detergent can remove more types of stains?
- Which type of plant produces the strongest fibers?
- Which planets have an atmosphere similar to earth’s atmosphere?
- Which types of careers are the most rewarding?