1. Cell Theory Do now copy and answer the following question: 1. What makes something living?

2. M.E.L. the O.G.R.E.

3. M.E.L. the O.G.R.E.

4. There are 3 needs of living things. M- Materials Food provides the materials necessary for growth and reproduction. These materials include such elements as nitrogen, oxygen, carbon dioxide, and water E – Energy All organisms require a certain amount of energy to think, breathe, sleep, etc. L – Living Space

5. O.G.R.E. O- organization organs grouped together are systems G- growth you need materials, energy, and living space R- reproduce rEsponding to the environment flight or fright response

6. All living things are made up of cells. Singled celled organisms are called unicellular.

7. Organisms with more than one cell are called multicellular

8. Are the needs and characteristics of one-celled and multi-celled organisms the same? Yes… think of it this way. The needs and characteristics of a single cell in a unicellular organism are the same as your cells’ needs and characteristics. They perform all of the activities that characterize life.

9. What activities that plants and animals do are carried out by cells?

10. If it is true, what is the main difference between the cell in a 1 celled organism and the cells of a multicellular organism? In a multicellular organism cells make up different parts of the body that have different functions. For instance, heart cells make up the heart.

11. We use a __________ to see cells? The first two men to study cells under a microscope were Robert Hooke and Anton van Leeuwenhoek in the 1660’s and 70’s

12. Robert Hooke gave the cell its name. While looking at a sample of cork, he saw tiny little compartments. This was a dead cell.

13. Van Leeuwenhoek was one of the first people to describe living cells http://www.youtube.com/ watch?v=Q2ezDdKyRUc

14. Observations and evidence gathered over a long period of time are summarized into 3 main concepts 1.Everything is made up of one or more cells 2. Cells carry out the functions necessary to support life 3. Cells only come from other cells We call this the Cell Theory

15. Believed in the theory of spontaneous generation they thought that bacteria grew from nonliving materials http://www.youtube.com/ watch?v=WNByRghR6sw

16. Louis Pasteur Lived in the 1800’s Noticed that people kept getting sick from eating specific foods. Disproved the theory of spontaneous generation

17. Using a microscope to study air, water, and soil, Pasteur found microorganisms everywhere. He found bacteria in the blood of animals, including the people who were sick. He called these “germs.” http://www.youtube.com/watch?v=j6CTloyTsAo

18. Pasteurization- the boiling of food to make sure that extra bacteria from the air will not grow on the food.

19. Check for Knowledge 1.How does cell theory and the theory of spontaneous generation disagree? 2. How was the theory of spontaneous generation disproved?