You observe a blood agar plate and see a clear/transparent area where the bacteria have been inoculated. With this information what are some possible outcomes if someone was infected with this type of bacteria?

Q: Why is the Widal Test performed? What disease does it indicate? Is the Widal test reliable?…

A: 1) Widal is the presumptive serological test for the diagnosis of enteric fever ,typhoid. ▪︎ It is a…

Q: You are working in the lab with Streptococcus pyogenes and two other bacteria. You streak all three…

A: The basal,  enriched, bacterial growth medium, named the blood agar medium encourages the growth of…

Q: The number of bacteria in a sample can also be quantified with other techniques, such as examination…

A: In microbiology laboratories the number of microorganisms present in a particular sample is…

Q: Bacillus cereus divides every 30 minutes. You inoculate a culture with 100 After 3 hours, how many…

A: Bacillus cereus is a rod-shaped, gram-positive bacteria. It is a facultative anaerobe. It is a toxin…

Q: You have a mixed culture of 2 different bacterial species. One of the species is Gram negative…

A: Answer: Gram negative bacilli are those rod shaped bacteria which have thin peptidoglycan layer…

Q: samples and trying to determine characteristics they contain. You determine sample M requires an…

A: On the basis of Habitat in which the microorganism live,  these can be classified into many types.…

Q: You use tubes to test aerotolerance of bacteria. From your samples you have 3 results: A. Bacteria…

A: The bacteria can grow only in the favourable conditions that is when there is optimum amount of pH,…

Q: In a bacterial culture on an agar plate, what is a zone of inhibition?     An area where the…

A: Microbial culture is a method of multiplying microbial organisms by letting them reproduce in…

Q: bacterium is grown in an environment with tryptophan added to the medium.  Describe how the bacteria…

A: Tryptopham  is an amino acid and is a necessary ingredient to  synthesise its protein. There are…

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: Given a log phase bacterial culture with 1 x 10^6  cells per ml and a generation time of 30 minutes…

A: Cell multiplication is due to the growth which leads to an increase in the number of bacteria over a…

Q: One of the following is considered as Fastidious bacteria: Select one: Staphylococcus spp.…

A: Bacteria are usually single-celled microorganisms that can be present everywhere. They are…

Q: You are given an unknown bacterial culture and you want to determine if it is resistant to…

A: Antibiotics are chemicals that fight bacterial infections in humans and animals. They work by…

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

A: Urine microscopy is a diagnostic tool used in diagnosis of various diseases such as bacterial…

Q: which one is more pathogenic? gram positive or gram negative bacteria? explain

A: Pathogens : It is the microorganism which cause damage to the host by causing diseases.  Difference…

Q: You decide to sample the bacteria growing on several items in a laboratory space. You follow aseptic…

A: By using an aseptic technique such as using applicator swabs dipped in a sterile broth solution to…

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: you looked under a microscope and found colony of perfectly round bacteria, all in a straight line.…

A: Streptococci and staphylococcus are both in special shape and are bacterias but the perfect round or…

Q: You counted 40 colonies on a plate in your dilution series. The plate was inoculated with 1.0ml from…

A: A microbial sample will have enormous amount of cells. To estimate this by calculation, the sample…

Q: Why is it important to follow sterile technique?

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: What is the correct shape of the unknown bacterium growing on your mannitol salt agar

A: Mannitol salt agar also known as MSA is commonly used selective agar in microbiology. This material…

Q: Would you use an inoculating loop to transfer bacteria to an agar deep tube?

A: Agar deep tube is a glass tube which is filled with solid medium. The medium is solid due to…

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: Bacteria whose colonies grow in long chains of spherical cells are classified as___.…

A: Streptococcus

Q: You are working with an intestinal bacterium of humans, which you have in pure culture (in liquid…

A: Microbiology is the branch of biology that deals with study of organisms that are too small to be…

Q: Some antibiotics show no zone of inhibition against the microbe. How is this possible? Explain how…

A: Zone of inhibition The Zone of inhibition, it is a area around  the antibiotic drug which inhibit…

Q: A laboratory technician performed a series of 10 fold serial  dilutions shown below. he plated 0.1…

A: In this question, we are given colony count from different 10 fold dilutions. The volume plated from…

Q: The culture primarily contains nutrients such as sugars and a gel (agar). Why don’t viruses grow in…

A: Culture media are an integral part of the microbiology lab. There are various kinds of media used in…

Q: In spread plate method, inoculating loop is used to spread bacteria from the inoculation site. For…

A:

Q: Pretend you want to test whether a certain bacterium can take iron away from hemoglobin. What is the…

A: Culture media  Culture media is a type of media that support the growth of bacteria and fungi and…

Q: you are given a mix culture of S aureus, E. coli and P. aeruginosa. besides using the streak plate…

A: The first requirement for physically isolating a bacterium is that it can be cultured in the…

Q: Which of the following is true of commensal bacterium?   Question 2 options:   A)  commensal…

A: Answer- Commensal bacterias are the part of microbiota that induces immune response against the…

Q: How is UV radiation a good type of control mechanism against microbial growth? Please explain what…

A: UV radiation is a kind of non-ionizing radiation released by the sun and other manmade sources.…

Q: You have found a putative virus which is able to infect a bacterium causing increased mortality and…

A: Serial dilution is a series of sequential dilutions that are performed to convert a concentrated…

Q: what is your initial assumption of the organism causing this disease

A: Bacteria are the prokaryotic microorganism and based on the structural cell walls, Gram stain…

Q: Why does uninoculated agar plates still has visible growth of microorganisms? Where do you think the…

A: Microorganisms are present in abundance in nature. When there are no aseptic conditions then…

Q: Why is aseptic urine collection important when cultures are ordered? If you counted 20 colonies…

A: Urine collection for the urinary tract infection.

Q: A culture of Staphylococcus of unknown density is diluted as follows (letters represent each step):…

A: In a microbiology lab - food or environmental  - samples are regularly diluted to find out the…

Q: Which bacterium showed some hydrogen sulfide precipitate after 24 hours? Would you expect this to…

A: The TSIA test is an acronym for triple sugar iron agar test which is used to determine the…

Q: Why is low microbial population in milk samples a limitation for microscopic count?

A: The bacteria present in milk are lactococcus , lactobacillus, streptococcus, leuconostoc and…

Q: What are two possible reasons for choosing a bacteriostatic treatment over a bactericidal one? Name…

A: Q)What are two possible reasons for choosing a bacteriostatic treatment over a bactericidal one?…

Q: James inoculated a species of bacteria into KIA media and realized that it has a yellow butt and a…

A: Introduction KIA or the Kilger Iron Agar is a differential media that helps in distinguishing the…

Q: Name 3 gram negative and 3 antibiotics preferred against gram negative bacteria? Please answer at…

A: Gram-negative bacteria, such as Escherichia coli, Proteus, Klebsiella, and Entero bacter, are the…

Q: When testing the efficacy of an antibiotic against bacteria on an agar plate, it is important to…

A: The disk diffusion method, also known as the Kirby-Bauer test, is used to test the effectiveness of…

Q: A microbiologist sets up a serial dilution to analyze bacteria in raw milk.   Tube 1 – 0.1 mL milk…

A: Dilution is a phenomenon in which final solution are prepared having concentration comparatively…

Q: why is it important that you disinfect your work area both before and after working with bacteria?

A: Bacteria are present everywhere in each and every corner,present on non-living surfaces and as well…

Q: Abigail did not dry the top of her agar plate and stored it top up. Now she wants to count colonies…

A: Microorganisms are small organism that cannot be seen by naked eyes. Microorganism can be harmful to…

Q: Which of the following is true regarding pathogenic strains of Staphylococcus and Streptococcus,…

A: Staphylococcus are gram-positive cocci that grow in clumps whereas streptococci are also gram…

Q: bacterial culture has a concentration of 3.2 x 108 cells /mL. You dilute this culture as follows:…

A: CFUs are a measure of the number of progenitors present in a given population of cells; if an…