Section 7.1
Agenda
 Lab reports due!
 Test corrections for Ecology and Biochem.
Tests
 Cell theory
 Prokaryotes vs. Eukaryotes
 Read Sections 7.1 and 7.2 for Homework
 Due Pro & Eu cells double bubble map.
Test corrections
 For each test that you are correcting,
complete a test correction sheet.
 If you run out of room on your sheet, use a
sheet of notebook paper.
 When you are finished with your
corrections, staple your test and correction
sheet together. Make sure your correction
sheet is on TOP.
The History of the Cell
 In 1665 Robert Hooke viewed a piece of cork
under a microscope.
 Leeuwenhoek designs his own microscope
and discovers other organisms.
 Schleiden: plant tissues are made out of
cells.
 Schwann: animal tissues are made out of
cells.
 Virchow proposed that cells arise from
existing cells.
 So why are these people and their ideas
important?
Cell Theory
 1) All living things are composed of one or
more cells
 2) Cells are the basic unit of structure and
organization for living organisms.
 3) Cell only come from existing cells which
pass copies of genetic material onto
daughter cells.
An Ode to the microscope
Compound Light Microscope
 Series of glass lenses and visible light
 Limitations :The properties of visible
light limit resolution.
 Maximum magnification is ~ 1000X
Electron Microscope
 Ones you need to be familiar with
 TEM- Transmission Electron
Microscope
 SEM- Scanning Electron Microscope
 STM- Scanning Tunneling Electron
Microscope
 AFM- Atomic Force Microscope
Introduction to Cells
Cells are the basic units of organisms
Cells can only be observed under microscope
Basic types of cells:
Animal Cell
Plant Cell
Bacterial Cell
Number of Cells
Organisms may be:
• Unicellular – composed of one cell
• Multicellular- composed of many
cells that may organize
Cells May be Prokaryotic or
Eukaryotic
Prokaryotes include bacteria &
lack a nucleus or membrane-bound
structures called organelles
Eukaryotes include most other
cells & have a nucleus and
membrane-bound organelles (plants,
fungi, & animals)
Prokaryotes
Nucleoid region
contains the DNA
•Cell membrane & cell
wall
• Contain ribosomes
(no membrane) to
make proteins in their
cytoplasm
Eukaryotic Cell
Contain 3 basic
cell structures:
• Nucleus
• Cell Membrane
• Cytoplasm with
organelles