1. Antibacterial Lab
Biology - LHS

2. What is a bacteria?
Microscopic cells
Single celled organisms

3. Bacteria

4. How do bacteria make us sick?
Once inside our bodies they reproduce rapidly – every 20 minutes.
Bacteria release toxins that make us feel ill.
Examples:
Food poisoning
Cholera
Typhoid
Whooping Cough
Gonorrhea

5. Types of Bacteria

6. How can we prevent bacterial infections?
Food poisoning –
Water born diseases –
Contagious diseases –
Sexually transmitted diseases -

7. How do antibiotics work
How do antibiotics work? Target reactions that are different from humans.
Cell wall synthesis
Protein synthesis
Cell membrane synthesis
Cellular respiration

8. How do antibacterial agents work?
Inhibit growth
Kill the bacteria cells

9. The Lab Choose the bacteria you want to use E.coli – gram negative
Micrococcus luteus – gram positive

10. The Lab Choose the substances you want to test. Antibiotic
Antibacterial agents

11. The lab Don’t open the dish Measure the diameter of the zone in mm
Data collection
Don’t open the dish
Measure the diameter of
the zone in mm
Include the paper disk
Put petri dish in biohazard
bag
WASH HANDS!
Calculate average for
experimental and control