B DC

Q: A food sample with an unknown number of contaminating bacteria was serially diluted to 10-6. A…

A: Serial dilution of a food sample containing unknown quantity of contaminating bacteria was performed…

Q: enrichment culture to isolate aerobic and anaerobic nitrogen-fixing bacteria, sulfate-reducing…

A: Enrichment culture:  This type of culture containing  certain growth media ,allows  and  favours the…

Q: Approximately how many bacterial colonies are present on plate B?

A: Bacteria are small, microscopic, and unicellular organisms that are found almost everywhere on the…

Q: Is the Triple-Sugar Iron Agar (TSIA) a complex or defined medium? Explain based on its composition.…

A: Introduction A solid or liquid substrate that can be used to grow cells or organ explants; a medium…

Q: 1. A plate with a final dilution factor of 107 produced 210 colonies. a) What was the original…

A: Dilution is the process of diluting or mixing two or more substances or compounds; it is also known…

Q: a food sample with an unknown number of contaminating bacteria was serial diluted to 10-6. the 10-6…

A: Serial dilution is a process of diluting a particular sample in a solution. The purpose of doing a…

Q: Why would farmers be concerned about nitrifying bacteria?

A: Nitrifying bacteria are a small group of aerobic bacteria belonging to the family Nitrobacteraceae…

Q: Does agar concentration affect the growth and morphology of bacterial colonies? What causes dense…

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Q: Which characteristic of the species used determines whether sterility was achieved when autoclaved?

A: Microorganism: These are too small organism which is impossible to see by naked eyes. They exist in…

Q: What are the disadvantages of doing a total microbial count by examining wet mounts under the…

A: Ans- Wet mounts have the following drawbacks: The benefit of being able to observe movement can also…

Q: Noah wanted to transfer Staphylococcus aureus from a broth to an agar plate. He picked up the broth…

A: The aseptic techniques are applied in the laboratory setup to reduce the risk of contamination. It…

Q: Is it acceptable to give a formal name to a microbe that hasn't been isolated and cultivated? What…

A: There are two main microbiology methods used for isolating bacteria from a clinical sample in order…

Q: Why was a blood agar, rather than a nutrient agar, plate used for the culture from your mouth?

A: Cultured bacteria are any bacteria that grow in the lab by the microbiologist using the required or…

Q: Did each handwashing treatment result in similar types of organisms growing on the plates? (look at…

A: The science of tiny creatures' biology includes viruses, bacterium, algal, fungus, slime moulds, and…

Q: When bacteria from a throat swab are streaked on blood agar, why is the agar stabbed several times…

A: The initial identification of the streptococcal and enterococcal species is based on their hemolytic…

Q: what is the physical characteristics of this streak plate? Look at a single colony on a streak plate…

A: The visual qualities of a bacterial colony on an agar plate are known as colony morphology. An…

Q: 1) What are all of the different colony types that can be seen on a mixed-culture streak plate?  2)…

A: Hi! Thanks for your question. As you have posted multiple questions, I am answering only the first…

Q: Why is it important to first determine whether growth occurred in a different medium, such as starch…

A: Culture medium can be described as a liquid or gel medium which provides minerals and nutrients to…

Q: A microbiology student was given a mixed culture of two different gram positive bacteria species to…

A: In Microbiology, we grow bacteria on culture medium. Culture media contains specific mixture of…

Q: Jessie is working with a 100% stock concentration of Clorox. She decides to add 100 μL of bacteria…

A: For calculating the unknown concentration of the tube we will be using the formula as mentioned…

Q: The use of sterile techniques and agar media enables microbiologists to study: a) Bacterial growth…

A: Agar is a polysaccharide composed of agarose and agaropectin. It is a gelatinous substance used in…

Q: You inoculated a culture with an initial cell count of 6.5x10^3 cells. The generation time for this…

A: Bacteria are prokaryotic organism and divides by binary fission that is responsible for doubling the…

Q: You have learned many different techniques so far this semester that allow us to identify pathogenic…

A: A pathogen is an organism that causes illness in its host, with virulence referring to the intensity…

Q: which handwashing treatment produced the highest number of colonies on the after side compared to…

A: ANSWER) Handwashing is necessary technique used for the prevention of entry of microbes into the…

Q: After streaking microbial culture on agar plates and observing colonial growth, TMTC usually…

A: TMTC ("Too Many to Count") is a condition in which the number of colonies on an agar plate exceeds…

Q: The statement, “In the laboratory, a sterile inoculating loop is moved across the agar surface in a…

A: The technique is streak plate technique. Streak plate method is a pure culture technique which helps…

Q: Why does fixation of the positive dye help bacteria stick to the slides?

A: Dyes in microbiology are for staining cells; they are used based on the chemical properties and the…

Q: One hundred microliters (0.100 ml) of a 10-5 dilution of a bacterial suspension plated on an agar…

A: Colonies of bacteria live on solid media. A colony is characterized as a detectable microorganism…

Q: Why are petri dishes ALWAYS stored and incubated upside down?   Question 17 options:   a)  helps…

A: ANSWER) Petri dish is a transparent dish which is shallow and is used with the purpose of holding…

Q: Why was the calcium chloride, bacteria, plasmid mixture incubated on ice and not at room…

A: The method of gene transfer in which rDNA is inserted directly into the host cell is called direct…

Q: What is one situation where Koch’s postulates are impossible to complete? In other words, what…

A: Robert Koch was a scientist who provided four postulates which were designed to prove that there is…

Q: Tom streak plated an Unknown bacterium on Monday. On Wednesday, her plate showed a continuous streak…

A: Streaking cultures on agar surface to get isolated colonies and to study the organisms, both known…

Q: is staphylococcus aureus cells under 40 times magnification bigger than onion cell or cheek cell?

A: Staphylococcus aureus is a Gram-positive, round-shaped bacterium that belongs to the Firmicutes and…

Q: What process would explain why the dyes spread through the agar?

A: Agar -- Agar is polymer and mixture of polysaccharides obtained from the cell wall of red algae .…

Q: In performing the Kirby-Bauer procedure in a clinical laboratory setting, why must the agar be a…

A: The Kirby Bauer antibiotic test, also known as the disc-diffusion test, employs an antibiotic disc…

Q: What was the purpose of leaving the cover on one set of agar plates? How did the growth on these…

A: The only microorganisms that can grow anywhere are bacteria. They can grow on specially prepared…

Q: Is the Mueller-Hinton Agar (MHA) a complex or defined medium? Explain based on its composition. Is…

A: Mueller and Hinton in 1941 developed Mueller Hinton Agar(MHA). MHA is used for routine…

Q: What is the purpose of the confirmed test in an experiment designed to test for coliform bacteria?

A: Coliform bacteria are either nonmotile or motile, Gram Negative, bacilli bacteria. These are found…

Q: Jessie is working with a 100% stock concentration of Clorox. She decides to add 100 µL of bacteria…

A: The scenario involves working with a 100% stock concentration of Clorox, bacteria, and a nutrient…

Q: You mixed up the numbers on the tubes when you inoculated the mannitol salt agar (MSA) plate. You do…

A: Differential media is a type of growth media used in the labs to grow and differentiate or…

Q: 1) would you describe the contents of the soil-inoculated broth as being a “pure culture”? Why or…

A: 1. A soil-inoculated broth cannot be considered as a “pure culture”. A pure culture is a collection…

Q: Which bacterial species exhibited true motility on the slides?

A: Bacteria are single-celled prokaryotes ubiquitous in nature. As such, they can be found in different…

Q: What is the most difficult type of microbial cell or structure to kill? What methods can be used to…

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Q: how to find out the test is differential or selective in the microbiology lab test?

A: Many kinds of medias are used in microbial study. Two types of media having similar inferred names…

Q: Based on the growth you saw on your Lee’s Agar plate, what conclusions can you make about the…

A: Lee Agar is used to study the bacteria that can grow on yogurt. It is primarily used to count the…