Which of the following would suggest your stock culture is contaminated? Gram stain indicates Gram-positive bacilli. Broth media become turbid. Gram stain indicates both Gram-positive cocci and Gram-negative bacilli. Colony morphology is uniform on the streak isolation plate. Gram stain indicates Gram-positive staphylococci.

Q: From a contaminated intravenous catheter you isolate Gram-positive cocci, beta-hemolytic, and…

A: MSA stands for Mannitol Salt Agar, and it is commonly used as a medium for selective and…

Q: Possible Unknown Strains: Stapylococcus epidermidis, Bacillus subtilis, Staphylococcus aureus,…

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Q: A patient enters the clinic demonstrating signs and symptoms of meningitis.  A spinal tap is…

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Q: You have a culture that has 5 X103 cfu/ml of bacteria in it. You perform a serial dilution by adding…

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Q: Which potential pathogen has been isolated? Staphylococcus aurues Streptococcus pyogenes/GAS…

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Q: You found a bright blue growth on a tomato you had left on your kitchen counter. You’ve never seen a…

A: Introduction  A hypothesis is a proposed explanation for a phenomenon or observation that can be…

Q: STREPTOCOCI Gram positive cocci in chains, spherical to ovoid Catalase (-) Non-motile ; Capnophilic…

A: STREPTOCOCCI They are gram positive  cocci arranged in chains or pairs . They are members of the…

Q: Imagine a microbiologist performed a series of Gram stains but forgot to perform the destain step…

A: Bacteria are prokaryotic organisms that contain cell walls. Bacteria are further divided into…

Q: What is the correct shape of the unknown bacterium growing on your MacConkey agar?

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Q: Samples from an ill patient were collected by a physician for testing. A bacterial infection is…

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Q: n a culture tube labeled X as your unknown. Outline the 7 steps that will enable you to determine…

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Q: A urine sample with more than 100,000 organisms is considered indicative of infection. A urine…

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Q: How would you grow a streptomycin-resistant strain E. coli bacteria was spread on both agar plates…

A: Bacterial resistance does have the capacity where bacteria will withstand the effects of antibiotics…

Q: Which of the following tests can be used to distinguish between group D streptococcus and other…

A: Group D is the classification of streptococcus bacteria. These are gram positive bacteria, have…

Q: What color would you expect for a gram positive microorganism for each of his incorrect attempts?…

A: Gram staining is a technique which is used to identify the bacterial cell type, whether it is gram…

Q: Which of the following is FALSE about interpreting the results of normal microbial flora experiment?…

A: Normal microbial flora: Normal flora includes microorganisms (bacteria, fungi, viruses, and…

Q: A microbe is growing on Sabouraud dextrose agar, which has a slightly acidic pH. Which of the…

A: A culture medium contains enough nutrients for the growth of targeted or desired microbe. Different…

Q: The below  photograph shows a Gram-stained slide viewed using a light microscope set at brightfield…

A: Gram's staining is a technique used to distinguish between Gram negative and Gram positive bacteria.…

Q: Which of the following is FALSE about interpreting the results of normal microbial flora experiment?…

A: From shortly after birth until death, every human being's skin and mucous membranes are home to a…

Q: From , figure  Explain how this technique can beused to diagnose infections with group A…

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Q: why would selecting a colony from a blood agar plate to test with enterotube be bad

A: Selecting a colony from a blood agar plate to test with an Enterotube may not be ideal for several…

Q: Which of the following are true of the above picture? (Select all that apply.) V The bacteria are…

A: Gram-negative bacteria have a thin peptidoglycan layer which fails to retain colour after treatment…

Q: A patient sample will be analyzed. You are responsible to quantify the bacteria number. The dilution…

A: A sample of your blood, urine, skin, or any part of your body will be taken during a bacteria…

Q: The counterstain in the Gram stain is: A basic dye A negative stain A mordant An acid dye Necessary…

A: Staining is a method for enhancing contrast in material, usually on a tiny scale. Histology, as well…

Q: Why do you think the continuous culture has higher chances of contamination than batch and fed-batch…

A: Continuous culture may be a set of techniques wont to reproducibly cultivate microorganisms at…

Q: What type of media are culture medium 1 and culture medium 2? And its difference to each other?

A: Differential media allows growth of different species. This media is used to differentiate between…

Q: A bacterial sample collected from a patient is processed using a Gram's stain. After staining, the…

A: Gram stain is a test that looks for bacteria in areas where an infection is suspected, such as the…

Q: Which of the following techniques is not used to count bacteria?         Optical density…

A: Bacterial counting can be done by via- (1) Optical density- Optical density of bacteria can be used…

Q: Which of the following is not meant to reduce contamination of yoru sample? avoiding hand contact…

A: A microbial culture is done to multiply the specific strains of the microorganisms under specific…

Q: Picture that has dark background with red cells is the Negative stain and other picture in white is…

A: The Acid-Fast Stain is a lab test mainly used to find certain types of bacteria, like Mycobacterium…

Q: What method of bacterial measurement does this graph represent? Is it considered direct, or…

A: Here Bacterial growth is measured in terms of absorbance so, bacterial growth is measured with the…

Q: The presence of endotoxins in a sterile fluid indicates: the presence of gram-positive cell walls…

A: Endotoxins, additionally called LPS, are the part of the external membrane of gram-negative bacteria…

Q: Which of the following media selects for gram negative bacteria by inhibiting the growth of gram…

A: Selective media:- it usually allow the growth of a particular microbe and inhibit the growth of…

Q: differential plate enrichment plate selective plate streak plate pour plate

A: Differential plate:  Differential media used to distinguish between two related microbes. It used to…

Q: You collected a sample from a patient with a suspected STI. After Gram staining, you observed this…

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Q: Why are smears of capsulated bacteria not heat-fixed before staining as opposed to Gram staining?

A: Gram staining is a differential staining technique developed by Danish bateriologist Hans Christian…

Q: What test can help you differentiate staphylococci from streptococci? What reagent or media would be…

A: Both are gram positive bacteria.

Q: Which of the following plates (dilution factor) would you count/use to determine the original…

A: Dilution factor is a measure of the decrease in concentration of a solution that occurs in a…

Q: Describe characteristics of Streptococcus Agalactiae in the Agar: (How does colonies look like…

A: Streptococcus agalactiae is a Gram-positive, cocci-shaped bacteria that typically form chains. It is…

Q: Based on the pictures provided, tell me what I have for the gram-positive, and what I have for the…

A: Biochemical tests coupled with results of Gram stain which reveals the organisms Gram reaction and…

Q: about the Gram stain is false?   A-In the Gram stain, a dye called crystal violet is used to stain…

A: Gram staining is a differential staining method  used for differentiating bacterial species into two…

Q: What is the correct genus and species of your unknown Gram (+) bacterium?

A: Mannitol Salt Agar (MSA) It is used to determine halophilic and can fermenting mannitol ability of…

Q: The main of objective of using 13-Line streaking method is to get:

A: Answer: 13-Line streaking method: It is the technique of obtaining pure bacterial culture by…