chapter 3: cell structuresection 1: looking at cells 1 cell structure chapter 3
TRANSCRIPT
![Page 1: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/1.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
1
Cell Structure
Chapter 3
![Page 2: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/2.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
2
Objectives
• Relate magnification and resolution in the use of microscopes
• Analyze how light microscopes function.
• Compare light microscopes with electron microscopes.
• Describe the scanning tunneling microscope.
![Page 3: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/3.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
3
Microscopes
Microscopes allow scientists to see what cannot be seen with the unaided eye.
![Page 4: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/4.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
4
Microscopes
Properties of Images
Magnification
Resolution
![Page 5: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/5.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
5
Microscopes
Magnification = the apparent increase in the size of the image
![Page 6: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/6.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
6
Microscopes
Resolution = the increase in visible details
![Page 7: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/7.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
7
Microscopes
![Page 8: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/8.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
8
Microscopes
Types of Microscopes
Compound light microscopes
Electron microscopes
![Page 9: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/9.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
9
Microscopes
Compound light microscopes use
1. Light reflected off of or passing through an object to produce an enlarged image.
![Page 10: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/10.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
10
Microscopes
2. Two kinds of lenses
• Ocular lens—lens set nearest the viewer’s eye
• Objective lenses—lenses nearest the specimen
![Page 11: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/11.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
11
Microscopes
Lens magnification is indicated by a number followed by X.
![Page 12: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/12.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
12
Microscopes
Total Magnification
• Calculated by multiplying the magnifications of the ocular and objective lenses.
Ocular magnification ……………10Xx Objective magnification………….40X Total magnification……………...400X
![Page 13: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/13.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
13
Microscopes
Light microscopes have limited use, practical magnification is limited to 1000X.
![Page 14: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/14.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
14
Microscopes
Electron microscopes
–Use a beam of electrons
–Produce images of very high magnification and resolution*
* up to 50 million X according to some sources
![Page 15: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/15.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
15
Microscopes
Electron microscopes
–Both electron beam and the specimen must be placed in a vacuum chamber, so living cells cannot be viewed.
![Page 16: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/16.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
16
Microscopes
Types of electron microscopes
Transmission (TEM)
Scanning (SEM)
![Page 17: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/17.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
17
Microscopes
Transmission Electron Microscope (TEM)
Reveals the fine details of a cell’s internal structure.
![Page 18: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/18.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
18
TEM micrograph
![Page 19: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/19.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
19
Microscopes
Scanning Electron Microscope (SEM)
Produces three-dimensional images of cell surfaces
![Page 20: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/20.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
20
SEM micrograph
![Page 21: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/21.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
21
Guided Practice
1. What is the difference between magnification and resolution?– Magnification means to make an image larger,
while resolution refers to the sharpness of the image.
![Page 22: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/22.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
22
Guided Practice
2. Compare the magnifying power of a light microscope with the magnifying power of an electron microscope.
– Light microscopes can magnify objects up to 1000X. Electron microscopes can magnify an object up to 200 000X.
![Page 23: Chapter 3: Cell StructureSection 1: Looking at Cells 1 Cell Structure Chapter 3](https://reader035.vdocument.in/reader035/viewer/2022062720/56649f045503460f94c187c0/html5/thumbnails/23.jpg)
Chapter 3: Cell Structure Section 1: Looking at Cells
23
Guided Practice
3. What is the main advantage of the transmission electron microscope?– It shows a cell’s internal structure in fine detail.