Date: November 16, 2015Aim #25: How are cells classified?

HW:1)Cheese Lab due Tomorrow

Do Now: Warm-Up NotebookDate Title of Activity Page #11/16 Viruses 46

Happy Birthday Dylan!!!

Compare and contrast these two cars?

SIMPLE

COMPLEX

How do these cells compare?

SIMPLE

COM

PLEX

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

Harsh Early Earth

What were the conditions on Earth at this time?1)Hot2)Little Oxygen3)Abundant Lightning4) Volcanic Activity

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 tolerateharsh environments

3)Their ability to adaptto 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-adam-jacobson

What are some features of prokaryotes?

1)Prokaryotes have NO NUCLEUS!!2) Have few organelles (mini-organs)3) PROKARYOTES = BACTERIA

** Although prokaryotesdo not have nuclei, theydo have DNA.

What organisms are made up of eukaryotic cells?

Plants Animals Fungi Protists

All these living things are made up of EukaryoticCells

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 boundorganelles

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?