Date: November 16, 2015
Aim #25: How are cells classified?
Do Now: Warm-Up Notebook
Date
Title of Activity
11/16
Viruses
HW:
1)Cheese Lab due Tomorrow
Page #
46
Happy
Birthday
Dylan!!!
Compare and contrast these
two cars?
How do these cells compare?
1) Cells are broken down into two main classes:
Cells
Prokaryotic
Eukaryotic
Prokaryotes:
Were probably the first life forms to
appear on earth 3.5 billion years ago
What were the conditions on
Earth at this time?
1)Hot
2)Little Oxygen
3)Abundant Lightning
4) Volcanic Activity
Harsh Early Earth
Miller and Urey in 1953
Steps:
1. Take molecules thought to be present in Earth’s early atmosphere:
•
Methane (CH4), ammonia (NH3), hydrogen (H2), and water H2O).
2. Run continuous electric current through the system:
•
this simulate lightening storms believed to be common on early earth
3. After one week:
•
•
10-15 % of C was now in the form of organic compounds.
2% of C had formed some amino acids.
4. Importance:
•
organic compounds like amino acids could be made easily under the conditions that
scientist believed to be present on early earth.
Why do you think Prokaryotes were the first life forms on
earth?
1)Simple Structures
2)Their ability to tolerate
harsh environments
3)Their ability to adapt
to changing environments
Read as Class
Endosymbiosis
ENDOSYMBIOTIC
THEORY
TED- How we think cells evolved?
http://ed.ted.com/lessons/how-we-think-complex-cells-evolved-adamjacobson
What are some features of prokaryotes?
** Although prokaryotes
do not have nuclei, they
do have DNA.
1)Prokaryotes have NO NUCLEUS!!
2) Have few organelles (mini-organs)
3) PROKARYOTES = BACTERIA
What organisms are made up of eukaryotic cells?
Plants
Animals
Fungi
Protists
All these living things are made up of Eukaryotic
Cells
What are some features of typical eukaryotic
cells?
1) They are more complex
2) Appeared later on earth
3) They have nuclei
4) They are larger
5) Have more organelles
6) Have membrane bound
organelles
Cell Size and Scale
http://learn.genetics.utah.edu/content/cells/scale/
CELL TYPES
• PROKARYOTIC
• HAVE only a few
ORGANELLES
• HAVE NO NUCLEUS
• PRIMITIVE CELLS
• Only Bacteria
• EUKARYOTIC
• HAVE ORGANELLES
• HAVE NUCLEUS
• MODERN CELLS
• All other living things:
animals, plants, fungi, protist
(unicellular organisms)
ENDOSYMBIOTIC
THEORY
Different Cell Types
How are they similar?
How are they different?