Thursday, December 27, 2012

is it possible for bacteria inside an organism to survive outside the organism?

Q. I am planning to research a bacteria in mealworms that allows them to digest polystyrene (Styrofoam). If I take the bacteria out of the mealworm, will they die?

A. From what I learned, yes, the bacteria living inside a cell does not usually survive long unless you mimic the exact environment of the inside of the cell. Some cells can survive outside of their natural habitats but not for long usually.


What are 2 types of good bacteria and 5 types of bad bacteria?
Q. I need 2 good bacteria and what they do that makes them good and 5 bad, and what they do to make them bad.

A. Depends on what you mean by "good" and "bad"? For example, E. Coli are a bacteria that live in all human intestinal tracts, and even on human skin. They help us extract nutrients by breaking down certain hard to digest foods. Yet, you hear all the time about E. Coli poisoning people from tainted meat. So, that is an example of a bacteria that may be "good" or "bad". That said, here are my picks:

Bad:

Streptococci-cause strep throat
Menegococci-cause menengitis
Pnuemococci-cause pneumonia
Staphylococci-cause staph infections and blood poisoning
Claustridia Botulinum-cause botulism
Salmonella-cause food poisoning

Good:
Lactobacillus-acid forming bacteria used to flavor many foods, including yogurt.
Streptococcus (again)-provides acidity to cheddar cheese.


What are some reasons why bacteria is beneficial to the human body?
Q. I've always known that some bacteria are harmful and others are beneficial, but I never knew how they are beneficial. I got curious enough to ask.


Just kidding this is so I don't get marked down on this question on my biology worksheet.

A. bacteria are beneficial because they keep our immune systems tuned to resist harmful bacteria, benign bacteria populate our skin, nostrils, vagina, etc. displacing those bacteria that can be harmful, and they populate our intestines and make vitamin K (blood coagulation, calcium adsorption, etc.).


How are bacteria able to produce new strains other than mutations?
Q. Bacteria reproduce by binary fission, which is an asexual process. How are bacteria able to produce new strains other than mutations?

A. They are able to take up plasmids, small circular pieces of DNA, from the environment or they can exchange plasmids during conjugation (the closest thing bacteria have to sex).





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