Quote (KingStannis @ Mar 6 2017 05:33pm)

if i like your answer i will give you 50 fg per

i need these by tonight

1. why do bacteria produce lactic acid?
Pretty sure not all bacteria produce lactic acid but for the ones that do it's because it's the end product of them metabolizing carbohydrates. Also since they have a high tolerance to low pH they can outcompete other bacteria that can't survive in the acid
2. what kind of dietary items would increase the number of lactobacilli in saliva?
I'm gna go ahead and say dairy products
3. without looking at the organism microscopically, how can we be certain the organisms growing in nitrogen free broth are nitrogen fixers?
If there is nitrogen in the broth by the end of it it means they were able to pull nitrogen out of the air, meaning they are nitrogen fixers, can't remember which tests do this but it can be observed qualitatively (broth changes colour or some shit)...look this up
4. besides plants, what other organisms can directly use fixed nitrogen?
Nitrifying bacteria
5. what is the purpose of nitrate broth control for nitrate?
The purpose of any control is so that you know it contains the substance (in this case nitrate) so when you test for it, you would expect any other tube that contains nitrate to react the same (e.g. turns the same colour or cloudy or bubbly w/e)
6. test indicates nitrate reduction to n2 gas by the accumulation of gas in the durham tube. this being the case, why do we perform the nitrate test?
7. does a positive presumtive test indicate that water is potable? why?
8. why is the mpn test qualitative rather than quantitative?
9. what is the function of the following in the MPN test?
LTB
BGLB
EC Broth
10. Name at least 2 bacterial diseases that can be transmitted by polluted water.
e.coli? cholera?
11. determine number of PFU's per mL in a sample that has been diluted 10^-8 and has given 200 PFU's when .5 mL is plated

Quote (MOMOtheflyingLEMUR @ Mar 6 2017 06:13pm)

answered the easier ones

Quote (KingStannis @ Mar 6 2017 06:35pm)

ok but what is the purpose of the lactic acid? why is it produced?

im just gonna send 250 hope your answers to 10 are correct those question marks aren't too assuring.

Quote (KingStannis @ Mar 6 2017 02:33pm)

if i like your answer i will give you 50 fg per

i need these by tonight

1. why do bacteria produce lactic acid?
2. what kind of dietary items would increase the number of lactobacilli in saliva?
3. without looking at the organism microscopically, how can we be certain the organisms growing in nitrogen free broth are nitrogen fixers?
4. besides plants, what other organisms can directly use fixed nitrogen?
5. what is the purpose of nitrate broth control for nitrate?
6. test indicates nitrate reduction to n2 gas by the accumulation of gas in the durham tube. this being the case, why do we perform the nitrate test?
7. does a positive presumtive test indicate that water is potable? why?
8. why is the mpn test qualitative rather than quantitative?
9. what is the function of the following in the MPN test?
LTB
BGLB
EC Broth
10. Name at least 2 bacterial diseases that can be transmitted by polluted water. Cholera, Salmonella typhi.
11. determine number of PFU's per mL in a sample that has been diluted 10^-8 and has given 200 PFU's when .5 mL is plated