Lab 1: Scientific Method

Question 1

What is a dependent variable?

Answer 1

the variable that is being observed or measured

Question 2

What is a independent variable?

Answer 2

the variable that is being changed

Question 3

What kind of animal is a pillbug?

Answer 3

crustacean

Question 4

What kind of skeleton does a pillbug have?

Answer 4

an exoskeleton

Question 5

What structures do pillbugs use for gas exchange, and what condition must these structures be in to function properly?

Answer 5

gills, slightly moist

Question 6

What do scientists do first when they begin to study a specific topic?

Answer 6

an observation

Question 7

What is a tentative decision about the outcome of an experiment?

Answer 7

a conclusion

Question 8

What do we call the sample that lacks the factor being tested and goes through all the experimental steps?

Answer 8

a control group

Question 9

What do scientists call the information they collect while doing experiments or making observations?

Answer 9

data

Question 10

Which is made by a scientist following experiments and observations, a theory or a conclusion?

Answer 10

a conclusion

Question 11

What do scientists develop after many years of experimentation and a lot of similar individual conclusions?

Answer 11

a theory

Question 12

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?

Answer 12

my hypothesis would be supported

Question 13

“All organisms are made of cells.” hypothesis, conclusion, or theory

Answer 13

scientific theory

Question 14

“The data show that trans fat intake raises cholesterol and contributes to heart disease.” hypothesis, conclusion, or theory

Answer 14

conclusion

Question 15

Why is a theory more comprehensive than a conclusion?

Answer 15

it has multiple hypothesis and more data to support the main claim

Question 16

Why is it important to have a control substance for an experiment?

Answer 16

to make sure that the experiment isn’t flawed

Question 17

Why is it important to test a pillbug’s response using one substance at a time?

Answer 17

to get individual data for each substance without any outside variables dictating the response

Question 18

When carrying a microscope, hold it securely with one hand under the _______ and one hand on the _______.

Answer 18

base, arm

Question 19

The total magnification of the scanning objective of the microscopes that we are using in class is:

Answer 19

40x

Question 20

The microscope you use in class is a :

Answer 20

compound microscope

Question 21

When using the scanning objective, it is better to use:

Answer 21

a small amount of light

Question 22

True or false: Epithelial cells have cell walls

Answer 22

false

Question 23

When you change from the scanning pawer to the high power, the field of view:

Answer 23

decreases

Question 24

What is acceptable to use to clean the lenses of a microscope?

Answer 24

lens paper

Question 25

When you change from scanning power to low power, the working disctance:

Answer 25

decreases

Question 26

The ability to distinguish two objects as separate is termed:

Answer 26

resolution

Question 27

When focusing a microscope, when should you not use the coarse adjustment?

Answer 27

you should not use the coarse adjustment knob when you move to a higher lense

Question 28

When looking into your microscope, you see a dark crescent-shaped object. What is most likely to be the issue?

Answer 28

the objective isn’t fully clicked into place

Question 29

When one moves the microscope stage to the left, the image moves to the:

Answer 29

right

Question 30

Which of the following is true of the iris diaphragm in this class?

Answer 30

it is never touched in this class

Question 31

What happens to the depth of field as you decrease the magnification of the microscope?

Answer 31

it increases

Question 32

According to your lab manual, if the N : C ratio of a cheek cell is 60%, is it considered a normal cell?

Answer 32

no

Question 33

The lower power objective of your microscope is:

Answer 33

10x

Question 34

What is the name of the thin glass plate that is placed on top of a specimen?

Answer 34

coverslip

Question 35

What is the name of the circle you see when you look through the ocular lens of the microscope?

Answer 35

the field of view

Question 36

What is the function of the iris diaphragm of the microscope?

Answer 36

to control the amount of light in the “field of view”