A bacterial organism is used to inoculate mannitol broth medium. Following incubation the broth is yellow. This indicates that the organism: A) can use lactose and glucose B) cannot use lactose C) can use mannitol D) cannot use mannitol

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For growth, a mutant bacterium requires that an amino acid not required by the wild parental strain be added to the growth medium. This mutant is known as

Define and sketch the following: A) bacillus B) coccus C) strepto D) staphylo What is the differance between "Bacillus and bacillus"?

Identify the oxidase-negative, gram negative bacillus isolated from the blood cultures of a hospitalized patient with a urinary tract infection. The organism produced colorless colonies on MacConkey agar and gives the following biochemical reactions: PAD – positive H2S – positive positive Citrate – positive Ornithine positive Lysine – negative Indole - negative Urease –

Ethanol has been carried over into your DNA sample (two answers possible here, select both of them) a) The column tip touched the column flow through b) The cells stayed in the lysis buffer for too long c) You didn't add enough wash buffer d) You did not centrifuge a final time after the final wash

The principle and What type pf Media of the following Conkey Agar vii) MacConkey Broth viii) TSA Base for Blood and chocolate Agar ix) Mannitol Salt Agar x) Tryptic Soy Agar xi) Alkaline peptone water What is the principle of Growth Medium and Culture medium?

For each of the following situations, describe how bacteria on these growth. media would appear on the plate: A. On MacConkey agar, a bacterium that grows on the medium but is negative for lactose fermentation B. On EMB agar, a bacterium that grows on the medium but is positive for lactose fermentation C. On mannitol salt agar, a bacterium that failed to grow on the medium D. On mannitol salt agar, a bacterium that grew on the medium and fermented mannitol

Which of the following is an important measure that may prevent bacterial contamination in tube feeding formulas? Question 71 options: a)  Discarding opened containers of formula not used within 24 hours b)  Adding formula to the feeding container before it empties completely c)  Using the same feeding bag and tubing each day d)  Adding the full days worth of formula to the bag at the start of each day

You plated 1.0 mL of a sample diluted by a factor of 10^-5 and you counted 50 comonies after incubation. The concentration of bacteria in the stock culture is: A) 5x10^5 B) 5x10^4 C) 50x10^4 D) 50x10^-6 E) 5x10^-4