1. Do Now: 11.5 (Week 11) OBJECTIVES:
1. Describe the 3 parts of the cell theory.
Explain what a cell is and what it does.
TASKS:
Continue the Week 11 Do Nows on Week 10 Do Nows.
New Syllabus forthcoming… HW tonight is
List the 7 characteristics of life.

2. Microscopes were first invented and used a little over 300 years ago
Microscopes were first invented and used a little over 300 years ago. (late 1600s)
Robert Hooke and Anton Van Leeuwenhoek were the first scientists to study cells, with microscopes like this one.

3. This is where
The term
“cell” comes
From.

4. They were the first people to see a whole new world of tiny organisms
They were the first people to see a whole new world of tiny organisms. Recognize this one?

5. Microscopes have come a long way since then!
Advances in technology often cause advances in science. Today’s scientists can see all sorts of things…

6. Cells are the smallest units of life
CELL THEORY PART 1: Every organism is made of one or more cells.
Cells are very small, and require a microscope to be seen individually.
CELL THEORY PART 2: Cells are the smallest unit of life

7. There are billions of cells just like this one in your brain
There are billions of cells just like this one in your brain. They’re called neurons.

8. Systems of specialized cells work together in tissues and organs – like the eye, for example

9. Everything in your body is made of cells, from your liver (left) to your muscles (bottom)
Why do you think
they look so different?

10. There’s practically no limit to the number of different types of cells out there!

11. All of these microscopic organisms are made of cells too!

12. Cells interact with each other just like other organisms do – what’s going on here?

13. It’s a life or death struggle – can you guess what this is a picture of?

14. Will this “recipe” for creating mice work? Why or why not?

15. Spontaneous Generation?

16. History
Spontaneous Generation: the false belief that living things arise from non-living material today.
Was widely believed to be true until the 17th century

18. Pasteur Verbal Smackdown of S.G.
"Never will the doctrine of spontaneous generation recover from the mortal blow struck by this experiment." - Louis Pasteur
The “swan neck flask” experiment is famous.
CELL THEORY PART 3: “Cells come only from preexisting cells.”

19. So Where did the first cells come from?
Probably only possible in a lifeless world.
Self-replicating RNA molecules enclosed within lipid bubbles is the leading idea
Chemicals of life are easily produced by inorganic processes.

20. How small’s a cell? About 1,000 times BIGGER than molecules About1,000 times smaller than you can see with the naked eye

21. There are two basic types of cells
There are two basic types of cells. Eukaryotic cells are larger, more complex, and have a nucleus. Humans, as well as all other animals and plants are made of eukaryotic cells Prokaryotic cells, like bacteria, are all unicellular, small, and simple. They have no nucleus.

22. Remember that cell theory!
1. All living things have 1 or more cells.
2. Cells are the basic units of structure & function in organisms.
3. Cells come only from preexisting cells.