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Warm-up
• What is the difference between eukaryotic and prokaryotic cells?
• Which type of cells do humans have?
• So which type of cell is more complex?
Chapter 7.1
Microscope
&
Cell
Microscope
A microscope is an instrument used to make small objects look larger.
Three Types of Microscopes
Simple Microscope: only has one lens.
Compound Light Microscope: uses series of light and lenses to magnify
objects
Electron Microscope: Uses a magnetic field to bend the beam of an electron
MicroscopeA
B
C
DE
F
G
HI
J
K L
M
N
Microscope Parts
The Cell Theory• Robert Hooke – studied cork cells• Schleiden – plant cell• Schwann – animal cell• Cells – basic building blocks of all living things
– 1. All organisms composed of 1 or more cells– 2. Cells are the basic unit of organization of
organisms– 3. All cells come from preexisting cells
Prokaryote Cells
• Unicellular organisms that lack membrane-bound organelles– Example: Bacteria & Archaea
Eukaryote Cells
• Contain a nucleus and membrane-bound organelles– Examples: Animals, Plants, Fungi
Organelles – membrane bound structures with in eukaryotic cells, each organelle has a specific function for cell survival
Similarities vs. Differences
• cell membranes• ribosomes• Both have genetic
material/DNA• cytoplasm
• Eukaryotic cells have a nucleus, which contains the genetic material.
• The DNA in prokaryotic cells floats freely in the cell.
• Eukaryote cells have
membrane bound organelles.
• Eukaryotic Cells are on
average ten times larger than Prokaryotic cells.