Q: Since there are still bacteria left in pasteurized milk, why is it not routinely sterilized instead…
A: Hello! Since you have posted multiple questions, we are answering only first question. If you need…
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: What is agar and why is it necessary for growing bacteria on plates?
A: Agar is a mixture of two polysaccharides- agarose and agaropectin. It is derived from red-purple…
Q: What is the correct shape of the unknown bacterium growing on your MacConkey agar?
A: Macconkey Agar This agar includes bile salts, which are found in the gut. Bile salts help in…
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: What is the importance of agar plates and bacteria cultures in food microbiology?
A: There are different culturing techniques such as agar plates, broth culture, stab culture and solid…
Q: What growth factor is often supplied for cultivation of fastidious bacterial pathogens?
A: A fastidious organism requires specific nutrients for growth. In microbiology, the culture medium…
Q: Why is it important to become familiar with the microbiology laboratory's apparatus and equipment?
A: You should always know your lab equipment well before you do any type of experiment because without…
Q: How does McConkey agar serve as both selective medium and differential medium ?
A: MacConkey agar is a culture media that contain bile salts, crystal violet dye, neutral red dye along…
Q: What bacteria grow on both a MacConkey agar plate and Mannitol Salt agar?
A: Selective media The media is a kind of growth media which only allow the growth of a perticular…
Q: how does increasing the incubation temperature at which a plate containing psychrotrophic bacteria…
A: Psychrophiles or cryophiles (adj. psychrophilic or cryophilic) are extremophilic organisms that are…
Q: How does pasteurization affect the number of bacteria present in milk?
A: Pasteurization: It is a process which involves heating liquids at high temperature for a particular…
Q: What is the relation of microbail growth to microbial physiology?
A: Microbes are small organisms that are found in a diverse range of habitats. The rate of growth and…
Q: what is the culture media for gram-positive bacteria?
A: The culture media for gram positive bacteria is Mannitol salt agar . The presence of bile salts, as…
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: Which bacterium reduces nitrates in soil to nitrogen?
A: Nitrogen is needed by the organism for producing amino acids. Atmospheric nitrogen cannot be used as…
Q: what is the cause of different species of psychrotrophic bacteria growing in the CTSA medium at 7…
A: They can grow at extreme low temperatures and lead to spoilage of food by modifying the compounds…
Q: What is the principle behind sterilizing media before use and before disposal
A: Microorganisms may be beneficial or harmful. The harmful microorganism causes many infections which…
Q: Why is agar ideal for microbial cultivation?
A: The microbial cultivation is the process in which microorganisms are cultivated in the laboratory,…
Q: Why is it critical to be able to determine the overall number of bacteria present in a food sample?
A: Hi, Thanks For Your Question. Answer : Monitoring Of Total Bacterial Count Is Necessary, Because…
Q: How does the extremely high resistance of bacterial endospores influence sterilization practices,…
A: Endospore refers to a nonreproductive, dormant composition generated by some kind of bacteria. It…
Q: Why are Sterilization, Antisepsis and disinfection necessary?
A: Sterilization is the process of killing or deactivating all forms of microorganisms and spores.…
Q: what are these bacteria growing on BA and Maconkey agar
A: Blood agar or BA is an enriched culture medium having multiple nutrients. Blood agar is generally…
Q: WHAT IS THE TYPE OF Growth patterns on Agar Slant and Broth Medium
A: Growth and morphogenesis of plant is determined by the composition of culture media. There are few…
Q: what type of bacteria may cause spoilage in coconut water that has been in the fridge for more than…
A: Coconut Water Coconut water (CW) is a slightly sweet liquid made from the endosperm of coconuts.…
Q: What information can obtain from observing the growth of bacteria on liquid agar?
A: Liquid agar is a liquid media mixed with agar which when heated solidifies and then is used as a…
Q: Why must water be subjected to microbiological analysis?
A: Water is used for various purposes in daily lifestyle including food. Thus, it should be monitored…
Q: What information can obtain from observing the growth of bacteria on solid agar?
A: Agar is a jelly-like substance, obtained from rhodophyceae that are commonly knows as the red algae.…
Q: Which microbe is grown for use as protein – rich food?
A: Proteins are polymers made up of polymers of amino acids, which are structural units. They act as…
Q: Why does saliva not serve as a good microbialgrowth medium?
A: Saliva is the watery, frothy substance that is produced in the mouths of some animals, including…
Q: What is a pure culture and why is obtaining one useful inmicrobial ecology?
A: Microbes are living organisms. They are ubiquitous. They cannot be seen by the naked eyes. In…
Q: Why can milk become sour due to bacteria even though it has been pasteurized?
A: Pasteurization is the process in which non-packaged and packaged foods such as fruit juice, milk, or…
Q: Why is it important to distinguish between E.coli & E. Aerogenws in contaminated water samples?
A: E.coli is a rod-shaped, gram -ve, facultatively anaerobic, coliform bacterial species that is…
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…
Q: What types of bacteria grow on nutrient agar?
A: Nutrient agar is a nutrient-rich medium that allows the growth of a wide range of organisms in the…
Q: What type of agar is MacConkey agar?
A: MacConkey agar or MAC which is also described as a bacterial culture medium was named after the…
Q: Is there any pH buffering system or device for acidic microbiological experiments?
A: All biological processes are dependent on pH, cells and organisms must maintain their specific and…
Q: Why do we grow the bacteria in minimal media when testing for citrate utilization
A: Minimal media are those that provide the minimal nutrients possible for colony development, usually…
Q: How do you do the continuous culture of bacteria by chemostat and turbidostat
A: Answer: CONTINUOUS CULTURE : It is the method of culturing/growing of bacteria in a media in a…
Q: Is the mannitol salt agar (MSA) a complex or defined medium? Explain based on Composition. What kind…
A: The selective ingredients of MSA the bile salts and the dye, crystal violet which inhibit the growth…
Q: Write the limitations of sterilization by Dry heat?
A: The dry heat sterilization technique includes the removal or killing the microorganism and require…
Q: Which growth phase of bacteria is used for commercial producion of secondary metabolites and why?
A: Bacteria are unicellular and prokaryotic organisms that live in a wide variety of environments. It…
Q: What is the function of nitrifying bacteria?
A: Bacteria are a group of prokaryotic microscopic single celled organisms. They live in diverse…
Q: What is a starter culture and what is its purpose? What are the characteristics of a good starter…
A: STARTER CULTURE:- Starter culture are those microorganisms that are used in the production of…
how often must bacteria be subcultured from a broth to maintain culture viability?
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- what type of bacteria may cause spoilage in coconut water that has been in the fridge for more than a week?What is a starter culture and what is its purpose? What are the characteristics of a good starter culture and why is it necessary to add one to fermented foods instead of using the natural flora?A broth culture is initially inoculated with a single bacterial cell. For the first hour the bacteria has a generation time of 30 minutes, for the second hour the generation time has been reduced to 15 minutes, and for the third hour the generation time has been reduced to 10 minutes. At the end of the third hour how many bacteria are present in the broth culture?
- What are the culture media that can be used for cultivating non-specific and specific microorganisms?Listen Which of the following methods of microbial control is used most often with surgical equipment? a) autoclave b) sugar and salting c) dessication d) lyophilizationWhat is the major difference between an enrichment culture and a selective culture? Why are microbial doubling times in nature typically longer than those obtained in the lab? Briefly describe the following mechanisms of measuring bacterial growth: Direct microscopic cell count Plate count Most probable number
- After streaking microbial culture on agar plates and observing colonial growth, TMTC usually happens. What are the causes of TMTC plates (plates with more than 300 colonies that cannot be counted)? What are the ways to prevent this from happening?In a bacterial culture on an agar plate, what is a zone of inhibition? An area where the growth of bacteria is increased compared to the rest of the agar plate An area where the growth of bacteria is prevented or reduced compared to the rest of the agar plate An area where the growth of bacteria is not affected compared to the rest of the agar plate An area where the the agar becomes contaminated with moldWhy is nutrient broth considered as a universal growth medium for bacteria?
- Can simply observing the colonies formed on agar plates and the results of a few biochemical tests (catalase, gram stain and oxidative/fermentation test) confirm how many different types of bacteria are present in coconut water samples?Why do we grow the bacteria in minimal media when testing for citrate utilization?Why are the streak plates incubated at 7°C when selecting for psychrotrophic bacteria?