Lab 1: Scientific Method Flashcards
What is a dependent variable?
the variable that is being observed or measured
What is a independent variable?
the variable that is being changed
What kind of animal is a pillbug?
crustacean
What kind of skeleton does a pillbug have?
an exoskeleton
What structures do pillbugs use for gas exchange, and what condition must these structures be in to function properly?
gills, slightly moist
What do scientists do first when they begin to study a specific topic?
an observation
What is a tentative decision about the outcome of an experiment?
a conclusion
What do we call the sample that lacks the factor being tested and goes through all the experimental steps?
a control group
What do scientists call the information they collect while doing experiments or making observations?
data
Which is made by a scientist following experiments and observations, a theory or a conclusion?
a conclusion
What do scientists develop after many years of experimentation and a lot of similar individual conclusions?
a theory
If you hypothesized that your pillbug would be attracted to apple sauce and your pillbug moved toward the applesauce, what would you say about your hypothesis?
my hypothesis would be supported
“All organisms are made of cells.” hypothesis, conclusion, or theory
scientific theory
“The data show that trans fat intake raises cholesterol and contributes to heart disease.” hypothesis, conclusion, or theory
conclusion
Why is a theory more comprehensive than a conclusion?
it has multiple hypothesis and more data to support the main claim
Why is it important to have a control substance for an experiment?
to make sure that the experiment isn’t flawed
Why is it important to test a pillbug’s response using one substance at a time?
to get individual data for each substance without any outside variables dictating the response
When carrying a microscope, hold it securely with one hand under the _______ and one hand on the _______.
base, arm
The total magnification of the scanning objective of the microscopes that we are using in class is:
40x
The microscope you use in class is a :
compound microscope
When using the scanning objective, it is better to use:
a small amount of light
True or false: Epithelial cells have cell walls
false
When you change from the scanning pawer to the high power, the field of view:
decreases
What is acceptable to use to clean the lenses of a microscope?
lens paper
When you change from scanning power to low power, the working disctance:
decreases
The ability to distinguish two objects as separate is termed:
resolution
When focusing a microscope, when should you not use the coarse adjustment?
you should not use the coarse adjustment knob when you move to a higher lense
When looking into your microscope, you see a dark crescent-shaped object. What is most likely to be the issue?
the objective isn’t fully clicked into place
When one moves the microscope stage to the left, the image moves to the:
right
Which of the following is true of the iris diaphragm in this class?
it is never touched in this class
What happens to the depth of field as you decrease the magnification of the microscope?
it increases
According to your lab manual, if the N : C ratio of a cheek cell is 60%, is it considered a normal cell?
no
The lower power objective of your microscope is:
10x
What is the name of the thin glass plate that is placed on top of a specimen?
coverslip
What is the name of the circle you see when you look through the ocular lens of the microscope?
the field of view
What is the function of the iris diaphragm of the microscope?
to control the amount of light in the “field of view”
