Chapter%202%20Test

1
Class Topics
Title Biology 9/29/06
Objectives

• To assess learning about biochemistry.

• Chapter 2 Test
• Keep on beginning and failing. Each time you
  fail, start all over again, and you will grow
  stronger until you have accomplished a purpose -
  not the one you began with perhaps, but one
  youll be glad to remember.
• Anne Sullivan

Saturday, September 01, 2018 1157 PM
2
Class Assignments
By When
What

• Chapter 2 Test 9/29/06
• Chapter 2 Homework/Lab Corrections 10/3/06
• Read 49-54 10/3/06
• Due this class period
• Due next class period
• Due in the future

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Posttest Activities

• Hand in test
• Choose one of the following
• Read 49-54
• Correct homework/labs

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1A 4B Grade Sheet
5
2A Grade Sheet
6
3A Grade Sheet
7
4A Grade Sheet
8
Characteristics of Microscopes

• Magnification
• Image appears larger than it is
• Eyepiece 10x
• Objectives 4x, 10x, 40x
• Resolution
• Clarity of the image
• Gets poorer with increased magnification

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Microscopes

• Simple light microscope
• One lens
• Living or dead specimen
• Compound light microscope
• more than one lens
• resolution is a problem
• Must be transparent (very thin)
• Living or dead specimen

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Microscopes

• Electron microscopes - use a beam of electrons
  (dead)
• Transmission (TEM)- electrons pass through - very
  thin specimen
• Scanning (SEM)- electrons bounce off and get an
  image from the outside
• Scanning tunneling
• Uses a microprobe
• Can be used on living or dead organisms

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Magnifications

• Simple light 5-25x
• Compound light - 2000x
• Electron microscopes
• SEM 200,000x
• TEM 2,000,000x
• Scanning tunneling 1,000,000,000x

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Compound Light Microscope Parts

• Eyepiece
• Tube
• Revolving Nosepiece
• Objectives
• Base
• Stage
• Stage clips
• Diaphragm, iris, condenser

From http//www.microscopy.info/microscopy/light/
glossary.aspx