―Why do you suppose bacteria haven’t taken over the earth?‖

Brainpop: Bacteria

DiscEd Cells: the Building Blocks of Life—Two Types of Cells: Prokaryotes and Eukaryotes (first 4 segments+conclusion)

http://www.cellsalive.com/ecoli.htm

Describe what is happening.

Will bacteria continue to reproduce indefinitely? Why or why not?

http://www.cs.montana.edu/webworks/projects/stevesbook/contents/chapters/chapter002/section002/black/page001.html

Where is growth/cell division the fastest? Slowest?

What might cause growth to slow down?

The cell is the basic unit of life.

In other words, cells are like building blocks or pieces of Lego that can join together to make living things.

For example, plants and animals – and you and me.

We know that cells build things

Another important function is to carry out chemical reactions that are necessary to keep the organism alive.

The simplest organisms have just one cell and are called unicellular.◦ Uni = one

◦ Cellular = cell

An example is the Amoeba

Some organisms have billions of cells and are called multicellular.◦ Multi = many

◦ Cellular = cell

An example is humans

Eukaryotes– have a true nucleus with a nuclear membrane and organelles, ex: skin cells

Prokaryotes – no true nucleus, no nuclear membrane , ex: bacteria

The first cell on earth came into existence more than 3.5 billion years ago.

Oldest life forms contain no membrane-bound organelles, not even a nucleus.

For at least 2 billion years, prokaryoteswere the only forms of life on earth.

Cells of animals, plants, fungi, and protists

Have a nucleus

Have membrane-bound organelles

https://www.youtube.com/watch?v=ruBAHiij4EA&safe=active

Use graph paper or computer generated graph.

Use a pencil to create graphs and axes. ◦ Colour graphs are appealing too.

Use a ruler to draw axes. ◦ Don’t put axes too close to the edge of your paper. Leave

space for labels.

Title the graph; in pen.

Label axes. Remember to include units. ◦ ie: Time (s) –meaning time in seconds or Distance (m) –

meaning distance in meters. Some labels may not have units, ie: Number of bacteria.

Choose appropriate scale on axis to display shape of graph.

Page 25, SciencePower 9 textbook

◦ Complete the Graphing Human Body Growth activity

Follow the rules for graphing, use graph paper

Answer the ―What Did You Discover?‖ questions in complete sentences on the back of your graph paper