Bio Lab Chap. 1-2

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1. Scientific Method
• 1. Make observations
• 4. Test hypothesis
• 5. Accept or reject hypothesis
• 6. Repeat the test
2. Hypothesis
And educated guess
3. Independent variable
thing that can be changed or manipulated by researcher
4. Dependent variable
• the observed outcome of the test
• Depends on the independent variable
5. Control variable
All other variables that must remain constant during the test
6. Two groups in experiment
• 1. control group
• 2. experimental group- independent variable given only to this group
7. Prediction
• Formulated from hypothesis
• Written in an "if-then" statement
8. Null hypothesis
states that the treatment has no effect on the outcome of the experiment
9. Beaker
cylinder shaped device that is short and stubby
• Taller, funnel like device
• Easy to swirl
taller, cylindrical shaped device
12. Pipette
skinny tube to draw 1 mL of liquid usually- most precise
13. Base Units
• Meters m distance
• Liters L volume
• Grams g mass
14. Metric system
• King Henry Died By Drinking Chocolate Milk
• kilo- 10^3
• Hecto-10^2
• Deka- 10^1
• Base
• Deci- 10^-1
• Centi-10^-2
• Milli- 10^-3
15. Magnification
• Tells how much larger the object appears under the scope than it actually is
• Ocular (10x) x objective
16. Field of view
The circular field you see when you look through the ocular
17. Depth of focus
the thickness of an object that is all in sharp focus at the same time
18. Working distance
• space between the slide and objective
• More space=less magnification
19. Compound light microscope
Typical microscope
20. ocular
Lense nearest he eye
21. Body Tube
Keeps ocular and ovjective lenses at proper distance from each other
22. Nosepiece
Permits interchange of low, medium, and high power objectives
23. Pointer
Found in ocular, can be moved by turning the black eyepiece
24. Arm
Supports body tube and adjustment knobs
25. Objectives
Contains lenses of various magnification
Changes the distance between the slide and the objective to focus an image
Permits exact focusing
28. Base
Bears the weight of microscope
29. Stage
Supports slides
30. Stage clps
31. Iris diaphrahm
Regulates amount of light going through specimen
32. Illuminator
Provides light source
33. Stereomicroscope
• Has two oculars
• Thick, opaque objects can be viewed with this microscope
34. Teaching scope
Has two oculars so two people can look at the same thing at the same time
35. Phase-contrast microscope
• uses light rays for illumination by filtering out certain rays
• Can ovserve live material
36. Transmission electron microscope
Can increase magnification by passing electrons, rather than light rays, through the specimen
37. Scanning electron microscope
Uses a moving beam of electrons to bounce the electrons off the specimen
 Author: genevalo ID: 87512 Card Set: Bio Lab Chap. 1-2 Updated: 2011-06-12 22:44:21 Tags: Biology Folders: Description: Chapter 1 Show Answers: