Cell Theory

Cell Theory

by Allison Pierce

What does this word mean?

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CELL​

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Does it make a difference who you are?

That's what happens with words like...

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Theory

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Scientists have a different definition of theory than we use in everyday language.

​Cell Theory is made of 3 major concepts. Please write these down!

​1. All living things are made of cells.

​2. Cells are the smallest unit of life.

​3. All cells come from pre-existing cells.

Multiple Choice

Which of the following is NOT a part of cell theory?

• All cells come from pre-existing cells.

• Cells are the smallest unit of life.

• All cells have cell walls.

• All living things are made of cells.

Multiple Choice

Which invention led to the discovery of cells?

• Telescope

• Barometer

• Microscope

• Telephone

Multiple Choice

What did Anton Von Leewenhoek look at under his microscope that led to his description of cells as "wee beasties?"

• Teeth scrapings

• Skin samples

• Human Blood

• Tree Bark

Multiple Choice

Who did Robert Hooke have an ongoing feud with during his lifetime?

• Anton Von Leewenhoek

• Isaac Newton

• Mattias Schleiden

• Theodor Schwann

Multiple Choice

Which of the following is true of cell theory?

• It was developed over time by one scientist.

• It was developed by a single scientist over a short period of time.

• It was developed by many scientists working together happily.

• It was developed by many different scientists over a long period of time.

​Please write the following in your notes:

​1665 – Robert Hooke: First to observe cells through a rudimentary microscope. He observed cork cells, and coined the term “cells."

​*Hooke May have looked like this, but we aren't sure!

​Keep going!

​1674 – Anton von Leewenhoek Observed the first living cells in teeth scrapings pond water. He called them “wee beasties" and animalcules.

Multiple Choice

Which scientist was the first to use the term "cells?"

• Robert Hooke

• Anton Von Leewenhoek

• Mattias Schleiden

• Theodor Schwann

​Next Up - Write this down!

​1838 – Mattias Schleiden Botanist (studied plants) who concluded that all plants and plant parts are made of cells. 

​And his partner...

​1839 – Theodor Schwann Zoologist (studied animals) who conclude that all animals are made of cells.

​The final piece of cell theory...

​1855 – Rudolph Virchow After looking at many different types of cells, he concluded that all cells come from pre-existing cells. 

​But Wait! There's More!

​** If you run out of room, please use the back of your paper!

​1970 – Lynn Margulis Developed Endosymbiotic Theory. This is the idea that complex eukaryotes evolved when larger prokaryotes engulfed smaller prokaryotes. The two then formed a mutually beneficial relationship that led to a new organism.

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​Endosymbiotic Theory Continued:

The major supporting evidence = mitochondria and chloroplasts have their own DNA and reproduce independently. 

Multiple Select

Which parts of complex cells have their own DNA and reproduce independenty? **Select all that apply**

• vacuole

• mitochondria

• chloroplasts

• cell membranes

Multiple Choice

According to Endosymbiotic theory, large, complex cells developed from:

• Beneficial relationships of other complex cells.

• Beneficial relationships between simple cells.

• Complex organisms like plants and animals.

• Predatory relationships between big cells and little cells.

​The End!

​If you need to access any notes that you missed, please check on Schoology in today's folder.

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​If you have time remaining, please review your stems for your quiz tomorrow!