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Lymphopoiesis wikipedia , lookup

• All life is made of cells
• Discovered after microscope invented
• 1665: Robert Hooke first observed cork (dead
plant bark)
– Cork reminded him of tiny rooms
• He named the empty boxes “cells”
• Three Parts:
– 1) All organisms are
made of cells
– 2) The cell is the most
basic unit of life
– 3) Cells come from other
• What’s the big problem
with this theory?
Cell Diversity
• Shape depends upon function
• Nerve Shape: Elongated branching
– Function: Sends messages to and from brain
• Red Blood Shape: Disc-like shape prevents clogging
– Function: Carries O2 throughout blood
• Skin Shape: Flat & broad; layers overlap
– Function: Covers and protects the body
• 1) Prokaryote: Cells without a nucleus and other
membrane-bound organelles
– Oldest cells known (~4 billion years old)
– Believed to have evolved first (oldest fossils)
– AKA: Bacteria
• 2) Eukaryote: Cells
with a nucleus &
membrane bound
– More complex cells
– Evolved from
– Ex: Protists, Fungi,
Plants, Animals
• Endosymbiosis Theory: Chloroplast & mitochondria were freeliving organisms
– Both were engulfed by a larger predator cell
– Both gave the larger cell an advantage (make food and energy)
– Predator cell provided each protection
• Over time, these cells could not survive without the mitochondria
& chloroplast
• Evidence: Mitochondria & chloroplast contain own DNA,
replicate, contain own ribosomes, make their own protein
• Cells shape is
related to its job
• Cells are the basic
units of life
• Cells come from
other cells
Who first identified cells?
What was he/she examining?
Name the three parts to the cell theory.
Explain how the shape of a blood cell allows it to
perform it’s job better.
Which category of cells contain nuclei?
Why are bacteria considered the oldest forms of
life on Earth?
How do prokaryotes and eukaryotes differ?
Which organelles are associated with the
endosymbiosis theory?
What evidence exists that the organelles from #8
were once free-living?