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Home Q & A Board Biology-Related Homework Help Zoology and Botany (Moderator: ehd123)
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jk56 jk56
wrote...
Posts: 389
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6 years ago

Assume that under ideal conditions bacteria divide every 20 minutes,
  doubling their numbers. Starting with a single bacterium under these
  circumstances, how many would there be after two hours? Four hours? Eight
  hours?


 
  What will be an ideal response?

Question 2

If bacterial colonies grow so rapidly, why dont we see them everywhere? Why
  havent they crowded out other forms of life?


 
  What will be an ideal response?

Question 3

Bacteria need both food and water to survive and reproduce. What provided
  these to the bacteria in your experiment? Do you think dairy products might
  provide a good source of food and water for bacteria to grow?


 
  What will be an ideal response?

Question 4

What are some possible explanations for your results? If you had unexpected
  results, what might have happened to contaminate your samples of potato?
  (Hint: Is the raw milk the only source of bacteria in the experiment?)


 
  What will be an ideal response?
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1 Reply

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Replies
wrote...
#1
6 years ago
Answer to #1

Two hours: 48 bacteria; four hours: 3,072 bacteria; eight hours: 12,582,912 bacteria

Answer to #2

Conditions are not always favorable for bacterial growth. Growth is limited by many
factors.



Answer to #3

The potato provided a source of nutrition and water. Potatoes are a rich source of
water and nutrition; therefore, they provide a good medium for bacterial growth



Answer to #4

Bacteria are present on all surfaces and in the air. The untreated potato could have
been contaminated very easily from any of these other sources.
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