BS 6 - Bacteria

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

BS 6 - Bacteria

Today's lesson

1. Review HW fungi

2. Learn about bacteria

3. Start bacteria experiment

What are bacteria?

- unicellular organisms

-reproduction through cell division

- consist of cell wall and cell membrane (but do have a tiny piece of circular DNA in the cytoplasm)

-live everywhere

-obtain food from other organisms

Bacteria

Notes

Characteristics of bacteria:

1. unicellular
2. have a cell wall
3. are prokaryotes (no nucleus)
4. autotrophic and heterotrophic

Which shapes do bacteria have?

How do we see bacteria?

Light microscope vs electron microscope

Building blocks of a bacterium

Living as a bacterium

Bacteria reproduce through cell division

Bacteria are everywhere

The good bacteria

Most bacteria are useful:

• Help digest food in our intestines
• Kill harmful bacteria on our skin
• Feed on dead organisms
• Can be used in making food: Yoghurt, Sauerkraut

...and the bad bacteria

Bacteria can cause many diseases, such as:

- Lung infection

- Food poisoning 

- Lyme disease 

Culturing bacterial colonies

pg. 252

in groups of 2

Make a hypothesis

Inoculate the medium in the petri dish with 4 objects

neurosys.com