Why is CFU more applicable to a culture of Streptococcus than to a culture of E. coli?

Q: If a bacterial isolate shows intermediate to moderate resistance to an antimicrobial, how might this…

A: Bacteria are microscopic single-celled prokaryotes that thrive in diverse environmental conditions.…

Q: What is the purpose of the pour plate technique? If a pure culture is used to inoculate the plate,…

A: PURPOSE OF POUR PLATE TECHNIQUE The pour plate techniques can be used to determine the number of…

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: How does pasteurization affect the number of bacteria present in milk? What differences, if any,…

A: To control microbial growth or contamination there are a number of aseptic techniques developed that…

Q: How can one distinguish E. coli from P.aeruginosa on nutrient agar? blood agar? EMB agar? What is…

A: Psuedomonas aeroginosa iscan aerobic organism that is motile, gram negative  , rod shaped bacteria…

Q: Why is the effectiveness of an antimicrobial agent determined using an exponentially growing…

A: The bacterial cell reproduce asexually by replicating and dividing their genetic material as well as…

Q: What are peptones, yeast extract, beef extract, thioglycollate, and agar? Why are they used in…

A: A suitable nutrient medium that provide appropriate biochemical environment and maintains all the…

Q: Are the large numbers of microorganisms found in the mouth cause for concern? Explain.

A: We are authorized to answer one question at a time.Since you have not mentioned which one,I am…

Q: Why del factor is important in media sterilization?

A: Sterilization, which was called by various means such as Del factor, Nabla factor and the…

Q: Why is it important for a microbiology laboratory technician to use aseptic technique?

A: The majority of the microbes onto which scientists work in laboratories are known pathogens.

Q: Why is it necessary to perform an enrichment procedure in isolating Staphylococcus aureus instead of…

A: Staphylococcus aureus is a Gram-positive round-shaped bacterium that is normally found in the upper…

Q: Why is it sufficient to stain cells from a SDA (Sabouraud Dextrose Agar) plate with crystal violet…

A: Introduction : Sabouraud agar, often known as Sabouraud dextrose agar (SDA), is a peptone-containing…

Q: Based on the same two strains of E. coli from the previous question, why do you see growth in the…

A: Ampicillin is a penicillin type of antibiotic substances containing medium So the  strain II can…

Q: What concentration of agar is used in a semisolid medium for motility determination?

A: Motility is a feature characteristic of only some bacteria. This ability allows the bacteria to move…

Q: What steps are necessary to ensure the sterility of materialcontaminated with bacterial endospores?

A: During endospore formation, the bacteria protoplasm is condensed to a limited volume, which leads to…

Q: Why do we test water for coliforms if they are not considered pathogenic?

A: Introduction Coliforms are gram-negative, non-sporulating and motile or immotile bacteria. They…

Q: How is the CTSA (Coconut tryptic soy agar) growth medium designed to meet the nutritional need of…

A: Coconut trypic soy agar media are general-purpose, non-selective media that provide enough nutrients…

Q: Contrast the terms thermal death time and decimalreduction time. How would the presence of…

A: Microbial growth can often be controlled by simple methods such as disinfection and decontamination.…

Q: Why are complex media preferable to chemically defined media for routinecultivation of…

A: Microorganisms require nutrients as an energy source and certain other environmental conditions to…

Q: Explain why sulfa drugs prevent bacterial growth without harming the human host.

A: Antimicrobial drugs are those which destroy or inhibit the growth of microorganism. They have their…

Q: Why are semisolid media sometimes preferred over slide techniques for evaluating bacterial motility?

A: Semi-solid media are soft media that is used in demonstrating the motility of bacteria and…

Q: LB (Lysogeny broth) medium for the growth of E. coli,

A: Pseudomonas putida is a kind of rod-shaped, Gram-negative, non-fermenting bacterium which is present…

Q: Why should culture media after inoculation be incubated at an optimal temperature immediately?

A: Culture media, also called as growth media, are particular combinations of nutrients and other…

Q: Why do we use the term CFU (colony forming unit) instead of reporting bacteria per ml? Explain.

A: The  bacterial species are responsible for causing several diseases within the human body. So, for…

Q: Why might viable cell cultures be of more use in microbialtaxonomy than preserved specimens?

A: Microbial taxonomy is a field of biological sciences that deals with the grouping of microorganisms…

Q: Why is it desirable that most cultures be inspected after 15 to 18 hours of incubation?

A: Introduction Microbial culture is a microbiological technique that involves actively multiplying…

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: What settings and time are normally used for sterilization in an autoclave?

A: The fundamental rule of steam sterilisation as cultivated in an autoclave, is to open every thing to…

Q: what treatment can kill the positive result of staphylococcus aureus in a catalase method ?

A: If an organism produces catalase enzyme, then it is able to breakdown hydrogen peroxide into water…

Q: How would you distinguish between Listeria monocytogenes and othe Listeria species on Chromogenic…

A: Listeria monocytogenes is a motile facultative anaerobic gram-positive rod that is present in…

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: Why is 15 minutes generally used for sterilization? Why is agar added to medium?

A: Sterilization is the process in which all life forms like microbes (fungi, bacteria, viruses,…

Q: How can moist heat sterilization can sterilize antibiotic solution?

A: Moist heat sterilization is a technique that uses heated, increased pressure steam to sterilize an…

Q: TRUE OF FALSE: Is E coli colonies colorless in Eosin Methylene Blue Agar (EMBA)? Coliform colonies…

A: Answer: Introduction: Bacteria inhabiting or predominantly present the human intestine is…

Q: Why is it Koch's postulates cannot be used for the microbe E. Coli. What limitations does E.coli…

A: The virulence and pathogenicity is considered as the ability of bacteria to cause disease. Robert…

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: Agar is a complex polysaccharide obtained from seaweed and cannot be digested by most…

A: Growth media is the nutrients rich medium that helps in the growth of several bacteria and other…

Q: What are the culture media that can be used for cultivating non-specific and specific…

A: A microbiological culture medium is a substance that promotes the growth, support, and survival of…

Q: What microbe requires serum components to be added to the growth medium?

A: Introduction Microorganisms:- An organism that can be seen only through a microscope, They live in…

Q: Which bacterial culture (Lb. plantarum, P. acidilactici, or P. pentosaceus) was most effective…

A: Bacteria are prokaryotic organisms that may be pathogenic in nature. The cells are devoid of…

Q: Why does hydrogen peroxide are most effective against probiotics?

A: Hydrogen peroxide is a peroxide. It acts as an oxidizing agent

Q: What is diluent? Why is it useful for working with bacterial samples?

A: Dilution is done to decrease the concentration of the original sample that is being tested. Dilution…

Q: Why are plated media stored in an inverted position?

A: Plated media enables the isolation of microorganisms from samples or specimens.

Q: What conditions are necessary to destroy endospores? In what device are these conditions achieved?

A: Endospores are dormant vegetative cells that have a thick outer covering making them resistant to…

Q: What would happen if you forgot to add NaCl in culture used for isolating vibrios? Which  species…

A: Vibrio bacteria are comma shaped(Curved rod shaped)bacteria; which shows mobility  because of the…

Q: Why is sulfate (SO42-) added to a Winogradsky column?

A: Winogradsky developed the columns as a means of enriching sediments and soils for microbes.…

Q: You have retrieved your MHA (Mueller-Hinton agar) plate, your materials, and your E. coli culture.…

A: Answer : First step of the kirby-Bauer test :-

Q: What is the hazard of the splattering tendency in flame sterilizing an inoculating loop? Can…

A: Aseptic preparation of culture media :-

Q: What type of reaction or lab test differentiates the presence of either staphylococcus bacteria or…

A: Staphylococcus Bacteria which grows in cluster are Gram-positive (catalase-positive). Streptococcus…

Bacterial Morphology

The bacteria are prokaryotic organisms that are single-celled, and are found to exist as free-living and possess a microscopic size. The morphology is found to vary in the bacteria, where some of them are identified as individual organisms and the others are detected as colonies. The size and shape of the bacterial cell also represent its morphology. 

Bacterial cell structure

Bacteria are single-celled, tiny creatures that may enter healthy tissues and grow rapidly. Bacteria are microscopic organisms that are tiny and unicellular. These are members of the prokaryote kingdom. They live in water, air, soil, and all-natural environments. They are used in industrial and therapeutic processes, and they support a wide range of plant and animal life. The first organism to appear on the planet. Bacteria-like creatures are the oldest known fossils. Bacteria can consume a wide range of organic and inorganic elements, and some may even survive in harsh conditions.