1. POP Quiz What did Robert Hooke contribute to science?
Who refined microscope lenses to increase the ability of the microscope?
Who believed that organisms were made of cells?
List the three parts of the cell theory

2. Answers Came up with the word “cells”. Anton van Leeuwenhoek
Schleiden and Schwann
All organisms are composed of one or more cells; the cell is the basic unit of organization; all cells come from other living cells.

3. Microscopes as windows into the cells
Chapter 7.1

4. Objectives
TLW compare the operation of a compound light microscope with that of an electron microscope
TLW learn the name and function of the various parts of a compound microscope.

5. Vocabulary Focus Compound Microscope
Scanning Electron Microscope (SEM)
Transmission Electron Microscope (TEM)

6. Section 7.1 Summary – pages 171-174
The Development of Light Microscopes
Compound light microscopes use a series of lenses to magnify objects in steps.
These microscopes can magnify objects up to times.
Section 7.1 Summary – pages

8. Development of Electron Microscopes
The electron microscope was invented in the 1940s.
This microscope uses a beam of electrons to magnify structures up to times their actual size.

9. Development of Electron Microscopes
There are two basic types of electron microscopes.
The scanning electron microscope (SEM) scans the surface of cells to learn their three dimensional shape.
The transmission electron microscope (TEM) allows scientists to study the structures contained within a cell.

10. SEM Pictures

14. TEM
The transmission electron microscope (TEM) is capable of magnifications of 100,000 times.
Unlike the scanning electron microscope, which uses reflected electrons, the TEM uses electrons passing through a very thin slice of the specimen.
TEMs are especially useful in studying the structure of cells, and in crystallography.

18. Show me what you know
Identify the type of microscope you would use to view each of the following:
A group of cells in a thin layer of onion
The details of the surface of a human hair.
The organelles inside a cell.

19. Two Types of Cells
Chpt 7.1

20. Objectives
Distinguish between prokaryotic and eukaryotic cells

21. Vocabulary Focus
Prokaryote
Eukaryote
Organelle

22. Two Types of Cells
Prokaryotic Cells: Cells that do not contain internal membrane- bound structures.
Example: bacteria
Eukaryotic Cells : Cells that contain membrane-bound structures (organelles).
Example: Plants and animals

23. Two Types of Cells
The membrane-bound structures within eukaryotic cells are called organelles.
Each organelle has a specific function that contributes to cell survival.

24. Prokaryotic Cell

25. Eukaryotic Cell