This method can be used tosterilize a liquid media without harming heat labilein
ID: 2159 • Letter: T
Question
This method can be used tosterilize a liquid media without harming heat labileingredients.
Autoclaving
Pasteurization
Freezing
Cold filtration
Addition of ethylene oxide to themedia
Consider two parallel cultures.They are in all ways identical except that one contains testsubstance X. You observe that a bacterium you are studying growsequally well in both media. Therefore, test substance X is___________.
A macronutrient
A micronutrient
An essential nutrient
A toxin
Not a nutrient
A microbe uses CO2 asits sole source of carbon and oxidizes H2 as its sourceof energy, to which nutritional group does this microbe belong?
Photoautotroph
Chemoorganotroph
Photoorganotroph
Chemoautotroph
A mutant bacterium does not producea functional hydroxamate. This bacterium would have difficultyobtaining ___________.
Phosphate
Iron
Ammonia
Thiosulfate
Hydrogen sulfide
A medium containing methylene blueand incubated at 55º C enriches for ______.
Mesophilic mycoplasma
Hyperthermophilic gramnegatives
Gram positives
Thermophilic gram negatives
Thermophilic gram positives
Bacterium “A” has agrowth rate constant of 4 doubles/hour. Bacterium “B”has a generation time of 0.25 hours/double. Which bacterium growsfaster?
“A” grows faster than“B”
“B” grows faster than“A”
A” and “B” growat the same rate
No conclusion can be made from thisdata
Assume you inoculated 100 cellsinto 100 ml of nutrient broth. You then inoculated 100 cells of thesame species into 200 ml of nutrient broth. After incubation for 12hours, you should have
More cells in the 100 ml
More cells in the 200 ml
The same number of cells inboth.
_________ halodurics useK+ as their osmolyte.
All
Some
No
A medium containing 3.2% NaCl and0.025% phenethyl alcohol would enrich for _________.
Nonhalophiles
Gram-negative halodurics
Gram-negative halophiles
Gram-positive hyperhalophiles
Gram-positive halophiles
The value of the minimum inhibitoryconcentration depends upon_________.
The microbe’s intrinsicsensitivity to the antimicrobial
The rate at which the antimicrobialdiffuses through the agar
Both A and B
Neither A nor B
Which enzyme would be used toneutralize the activity of the [OH·] free radical?
Superoxide dismutase
Catalase
Peroxidase
Nitrogenase
None of the above
Which of the following cansterilize?
70% ethanol
10% sodium hypochorite solution
Ethylene oxide
Mecurochrome
All of the above
You are developing a new line ofprotease containing laundry detergent. You plan on marketing thedetergent to the NFL to remove grass and blood stains from theiruniforms. You most likely isolated the protease from which group ofbacteria?
Acidophile
Neutrophile
Alkalophile
Strict anaerobes
Non-halophile
True or False: Fungi are betterosmophiles than most bacteria.
True
False
The cell density of population ofmicrobes expands six-thousand fold. Approximately how many timesdid the population double?
9
10
12
14
16
Thirty-six colonies grew onnutrient agar plate from 500l of undiluted sample in a standardplate count. How many cells / ml were in the original sample?
17,000
900
18
36
72
Explanation / Answer
1. pasteurization 2. not a nutrient post the rest again...too many questions in 1 post, againstCramster policyRelated Questions
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