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Microbiology lab help needed

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#1 biol251LAB



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Posted 29 November 2014 - 03:56 PM

I would need some help< really appreciate it:

1.   For drinkable water testing, the readycult test we use
a.   Made more contaminated water
b.   Detected pathogens
c.   Identified viruses in the water
d.   Made genus and species assignment easy
e.   Tells that fecal contamination has occurred. 

2.   Soil organisms are often very resistant to uv light. Why?
a.   Are gram negative and have thick wall to protect
b.   Are always living symbiotically with plants for protection
c.   Water in the interior blocks the light path
d.   When stressed they form spores


e.   antibiotic
f.   antiseptic
g.   bacteriocidal
h.   bacteriostatic
i.   coliform
j.   disinfectant
k.   pathogen
l.   antimicrobial 

22.   gram negative organism not likely to cause disease
23.   biological chemical that inhibits bacterial growth
24.   chemical suited for use on skin
25.   strong chemical suited for use on inanimate objects
26.   when withdrawn bacteria will continue to divide
27.   destroys all living bacteria
28.   chemical with activity against virus, yeast and bacteria


a.   acidophile
b.   alkaphile
c.   halophile
d.   mesophile
e.   neutraphile
f.   psychrophile
g.   spore forming
h.   themophile 

29.   found in soils, resistant to drying
30.   found in geysers and hot springs
31.   found growing in arctic tundra
32.   found in vinegar, wine and beer
33.   found in urea and feces contaminated soil or water
34.   found growing on your skin or at room temperature
35.   found growing in the great salt lake
36.   high or low pH will not be tolerated by this organism

3.   In order to obtain a confluent lawn of bacteria, you need to use

a.   Disposible loops
b.   Regular loops
c.   Inoculating needle
d.   Sterile cotton swabs 

4.   Why do we count CFU’s
a.   We assume colonies are formed by one bacteria and all its progeny
b.   Because it would be too hard to count individual bacteria
c.   Because MPN’s won’t work for organisms that resist broth culture
d.   Because they are Cute For U

5.   Lactobacillus and coliforms both ferment available sugars. The best alternative to the word ferment is
a.   Convert to alcohol
b.   Metabolize without oxygen
c.   Metabolize and requires oxygen
d.   Create lactose free products

6.   Hypertonic solutions may be used for
a.   Preservation of food
b.   Encourage pathogens to grow
c.   Increase cheese production by Lactobacillus
d.   Cleaning drinking water

7.   The definition of resident bacteria includes

a.   Resistant to antiseptics
b.   Easy to remove
c.   Deeply embedded
d.   Yeast


#2 bob1


    Thelymitra pulchella

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Posted 29 November 2014 - 10:40 PM

Homework works like this... you give the questions and some of your thoughts... then we help expand etc. the answers... no input from you, no answers from us.


And moved to appropriate subforum.

#3 biol251LAB



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Posted 30 November 2014 - 12:06 PM

ok, sounds fair. 


my answers 1 e., 2c,  23 h, 24f, 25j, 27g, 28e, 32a, 30h, 31f,34d, 35c,35e, 4b, 5b,7b.

#4 bob1


    Thelymitra pulchella

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Posted 03 December 2014 - 12:22 AM

And how did you come to those conclusions?

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