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Bacteria. Title. Do Disinfectants Work?. Purpose. Determine how well disinfectants control the growth of bacteria. Research. Bacteria are prokaryotes. Genetic Material in their cells is not contained in a nucleus. (prokaryote: no nucleus/bacteria) 2. Bacteria, living unicellular organism

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title
Title

Do Disinfectants Work?

purpose
Purpose

Determine how well disinfectants control the growth of bacteria.

research
Research
  • Bacteria are prokaryotes. Genetic Material in their cells is not contained in a nucleus.

(prokaryote: no nucleus/bacteria)

2. Bacteria, living unicellular organism

3. Three shapes

spherical: cocci

rodlike: bacilli

spiral: spirilla

4. Shape determined by

composition of cell wall

slide5

5. Flagellum, long whip-like structure that extends from the cell membrane out the cell wall.

6. Flagellum help the cell to move, like kicking you legs in water.

7. Bacteria may have many, one or none.

8. If bacteria have none, can not

move on their own.

kingdoms
Kingdoms

Classified:

2 Kingdoms

archaebacteria
Archaebacteria

~ ancient bacteria

~ Been around before dinosaurs. Resembles Earth’s first life forms.

~ Live in extreme environments

extreme heat: hot springs

extreme acid: lemon juice

extreme salt: Utah Great Salt Lake

extreme moist: bottom of swamps

extreme waste: sewage systems.

This bacteria is responsible for the foul smells

eubacteria
Eubacteria

~ Can not handle extreme conditions

~ They live everywhere else

~ Help maintain some of Earth’s physical conditions,

helping other organisms to survive.

Scientist think, these bacteria, are responsible for the formation of Earth’s atmosphere. Being autotrophic, making their own food, their by-product was oxygen. Descendants of these bacteria are responsible for about 20% of our oxygen

h ypothesis
Hypothesis

How do you think disinfectants work?

Do they really work?

experiment
Experiment
  • On the closed / taped lid of your petri dish, draw a line down the middle with a sharpie marker.
  • Label one side D the other C
  • Person A, will swab the table in a

random place in a zigzag pattern

  • Person B, open the lid of the petri dish,

zigzagthe swab down the D side. Do not poke

the swab in the agar. Cover petri dish quickly.

5. Person C, use antibacterial

cleaner washing the swabbed place.

6. Person D, repeat step 4, only zigzag

down the C side.

data analysis
Data/ Analysis

Draw and record your data in the following

conclusion
Conclusion
  • How did the appearance of each side change during this lab?
  • How did side D and side C compare? Explain any similarities or differences.
  • Based on the results of this lab, what recommendation would you make to your family about the use of disinfectants? Where in the house do you think this product would be needed most?