Download Natural Selection antibiotic resistance online lab

Name: __________________________________________________
Period: _____
Antibiotic Resistance: Natural Selection Online Textbook Activity
Directions: Go to http://my.hrw.com and login (student # for both name and password). Choose “Student Premium”
options once the e-textbook is open. Select Chapter 10 and “chapter review” in the box at the top and click “go”. Open
the multimedia lab and activities and select “ch.10: Evolution through Natural Selection” under virtual investigations.
Run through all 9 parts and answer the following questions.
Part 1:
Summarize the 4 steps of Natural Selection below:
Overproduction:
Variation:
Selection:
Adaptation:
Part 2:
Why can we observe bacteria’s evolution of becoming resistant to antibiotics in a short period of time?
Part 3: Label the bacteria part below
Part 4:
After 1 day, how many bacteria can be reproduced from a single bacteria?
Parts 5 and 6:
If a bacterium doubled every hour, how many hours would it take to have 16 million bacteria?
Part 7:
Most antibiotics don’t kill bacteria. How do they work then?
How do bacteria become resistant to antibiotics? Be specific in describe how enzymes are involved.
Name three examples of each:
3 Diseases caused by bacteria:
3 Bacteria that cause diseases:
3 Antibiotics to treat bacterial infections:
Part 8 and 9:
What bacterial disease has caused more adult deaths than any other infectious disease in the world?
In the investigation:
How many non-resistant bacteria will be used in each test?
How many resistant bacteria will be used in each test?
First test, Non-resistant and resistant bacteria growing without antibiotics in its environment for 5 generations.
Prediction of the ratio of non-resistant to resistant bacteria after 5 generations:
(increase, decrease, remain the same)
Results (ratio after 5 generations)_______________
2nd Test: With antibiotic Rifampin:
Prediction of the ratio of non-resistant to resistant bacteria after 5 generations:
(increase, decrease, remain the same)
Results: ratio after 5 generations. (Don’t forget to click on the “R” Rifampin to add it to the plate)_______________
3rd Test: with antibiotic Isonazid:
Prediction of the ratio of non-resistant to resistant bacteria after 5 generations:
(increase, decrease, remain the same)
Results: ratio after 5 generations. (Don’t forget to click on the “IS”)_______________
4th Test: With both antibiotics:
Prediction of the ratio of non-resistant to resistant bacteria after 5 generations:
(increase, decrease, remain the same)
Results: ratio after 5 generations. (Don’t forget to click on the “R” and “IS”)_______________
Analysis:
1. Why is it best to use a cocktail (a mixture of different antibiotics) when treating a drug resistant bacterial
infection?
2. How can you reduce chances of getting a bacterial infection?
3. If Bacteria “clone” themselves for reproduction, how did the resistance to an antibiotic first develop in bacteria?
4. Why is it important to make sure you take all of the antibiotics prescribed to you, even after you begin to feel
better?