Cell Theory

Do now copy and answer the following question:

1. What makes something living?

M.E.L.

the

O.G.R.E.

M.E.L.

the

O.G.R.E.

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

O.G.R.E.

O- organization organs grouped together are systemsG- growth you need materials, energy, and living spaceR- reproducerEsponding to the environment flight or fright response

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

Organisms with more than one cell are called multicellular

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.

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

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.

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

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

Van Leeuwenhoek was one of the first people to describe living cells

http://www.youtube.com/watch?v=Q2ezDdKyRUc

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 cells2. Cells carry out the functions necessary to support life3. Cells only come from other cells

We call this the Cell Theory

Believed in the theory of spontaneous generationthey thought that bacteria grew from nonliving materials

http://www.youtube.com/watch?v=WNByRghR6sw

Louis Pasteur

Lived in the 1800’sNoticed that people kept getting sick from eating specific foods.Disproved the theory of spontaneous generation

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

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

Check for Knowledge1. How does cell theory and the theory of

spontaneous generation disagree?

2. How was the theory of spontaneous generation disproved?