GEN BIO: RESEARCH PROCEDURES

Question 1

Light microscope

Answer 1

-Light is first passed through a specimen and then through a glass lens, which bends light in such a manner that an image is magnified
-many internal structures of the cell are too small to be seen, even through the light microscope, and thus the invention of the electron microscope

Question 2

Electron microscope

Answer 2

-invented in the 1950s greatly enhanced the study of cell biology
-sends a beam of electrons through a specimen
-can be used to examine structures that are too small to be seen through the light microscope
-the light microscope can magnify specimens up to 2000x whereas the electron microscope can magnify up to 2 million times

Question 3

Compound Microscope

Answer 3

-Magnify approximately 400 times under high power
-quality of lens determines resolution of microscope
-often stain the specimen before to make particular structures stand out
-common stains include Lugol’s solution, methylene blue, and Wright’s stain

Question 4

[data]
Variable

Answer 4

-Measurable factors or qualities that change during an experiment
-classified as independent and dependent

Question 5

[data]
Independent variable

Answer 5

One that is changed by the experimenter

Question 6

[data]
Dependent variable

Answer 6

Changes in response to the independent variable

Question 7

[data]
Constants

Answer 7

Factors that do not change

Question 8

Controlled experiment

Answer 8

-Seeking data on only one independent variable

Question 9

[data]
Representing in the form of a graph

Answer 9

The independent variable is always plotted on the x-axis and the dependent variable on the y-axis