All About Cells TEKS 7.12F recognize that according to the cell theory all organisms are composed of cells & cells carry on similar functions such as extracting energy from food to sustain life TEKS 7.3D relate the impact of research on scientific thought and society, including the history of science and contributions of scientists as related to the content

What do all of the following objects have in common?

They are all living things so they are all made of cells…

The Discovery of Cells 1665 – Robert Hooke is the first person to describe & name cells by looking at cork. This is what he saw.

1673 – Anton van Leeuwenhoek is credited with inventing the first microscope. He was the first person to observe microorganisms & single cells

1833 – Robert Brown reported the discovery of the nucleus.

1838 – Theodor Schwann, who studied animal cells, & Matthias Schleiden, who studied plant cells, came up with the original cell theory.

1858 – Rudolf Virchow showed new cells came from the division of old cells.

All living things are made up of cells. The cell is the basic unit of structure & function in all living things. All cells come from other living cells by division.

Cells contain genetic information (DNA) that is passed from one cell to another. All energy flow (metabolism) of life occurs within cells.

Cells are alive.

Cells can be very simple which makes them prokaryotic or they can be more complex with an organized nucleus which makes the eukaryotic.

Organisms can be unicellular so they are only made up of one cell or they can be multi-cellular where they are made up of many cells.

Cells in multi-cellular organisms have different structures, or parts, that are specialized to do certain functions or jobs.

All cells work together to help the organism function as a whole.

The characteristics & needs of an organism are in reality the characteristics & needs of the cells that make up the organism.

For example, you need water because your cells need water.

extracting energy from food by using water & gases Major cell functions: extracting energy from food by using water & gases

reproducing through cell division in order to grow & repair cells

responding & adapting to changes in the environment

fighting disease & infection excreting wastes