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: Why are endospore forming bacteria commonly found in soil?
A: A bacteria is a cell which is susceptible to a variety of environmental stress. Any environmental…
Q: Using one of the graphs obtained with the medium II, name the different phases of the bacterial…
A: Micro organisms are typically grown in a closed culture media. Nutrients are added according to the…
Q: What effect does decreasing the incubation temperature have on bacterial growth rate? Why?
A: Bacterial growth is proliferation of bacterium into two daughter cells, in a process called binary…
Q: Why is the level of contamination measured as number of colonies rather than size of colonies?
A: Microbiological contamination refers to the presence of unwanted or accidental introduction of…
Q: What is the best growth medium that contains glucose that can be used to acclimatize bacteria? and…
A: A growth medium is a liquid, solid, or semi-solid preparation that supports the growth of a…
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: Question 15 How would you sterilized a collection of petri dishes?
A: Sterilization is a process used to kill or remove the micro-organisms. This process is very…
Q: What is the purpose of the bacterial capsule? Answer in not more than 3 sentences.
A: Prokaryotic calls contain addition protective layer outside of the bacterial cell wall. It is…
Q: How does bacteria grow on agar plates?
A: Bacteria are the most primitive organisms on Earth. They can survive in most extreme environments as…
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: Do Gram-negative bacteria grow on PEA agar? If not, what prevents their growth?
A: ANSWER;-
Q: How could you determine whether the turbidity in your LB tube was from a mixture of different…
A: Introduction: The term "turbidity" describes how cloudy a solution is. Turbidity in a Luria Broth…
Q: A broth culture is initially inoculated with a single bacterial cell. For the first hour the…
A: * Given that The bacteria has generation time of 30 minutes. So it takes about thirty minutes to…
Q: Which bacterium produced a yellow halo, and how do you interpret this result? • If you grew…
A: Microbes require micronutrients and macronutrients for growth and multiplication. Required nutrients…
Q: Why are extended periods of exponential microbialgrowth in nature rare and often slower than…
A: Microbial growth is the proliferation of the microbe into genetically identical daughter cells, by…
Q: A culture of bacteria is found to have a DRT of 2 minutes. How long would it take to reduce the…
A: Heat is used for sterilization of those substances that can withstand it over longer periods or…
Q: Name and explain the culture media that can be used for cultivating non-specific and specific…
A: a) nutrient agar & tryptic soy agar, & brain heart infusion agar are culture media that can…
Q: While you were working on the oil spill problem, you received a report showing that the bacteria you…
A: The release of liquid petroleum hydrocarbons into the water bodies like oceans is known as oil…
Q: If you had a mixed culture that contained a Gram-negative enteric bacterium and Gram-positive…
A: MSA or mannitol sale agar used in microbiology. It encourages growth of some group of bacteria…
Q: What would you expect to see if you cultured Gram-positive, lactose-fermenting bacteria on MacConkey…
A: Given: What would happen if you culture gram positive, lactose fermenting bacteria in MacConkey…
Q: The graph shows the number of microbial cells (log scale) against time in a liquid culture. In which…
A: Bacterial growth is divided into four stages. During the lag phase, the bacterium prepares itself by…
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 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: If coliform bacteria are native to human colons, why the big concern over coliform contamination?
A: According to the question, we have to mention the solution of the question asked above i.e. If…
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: Taking microbial cells out of a stationary phase culture and putting them into a fresh, sterile…
A: Growth in higher organisms refers to a rise in size and volume, whereas growth in bacteria refers to…
Q: why are psychrotrophic bacteria incubated at 7 degrees
A: Each species of microbe has a preferred temperature that lies somewhere between its characteristic…
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: Do Gram-positive bacteria grow on PEA agar? If not, what prevents their growth?
A: Bacteria are common, mostly free-living organisms that are often made up of only one biological…
Q: Define the term “colony” as it relates to bacterial growth on solid media.
A: The pure culture techniques are carried out in the microbial laboratories, where the microbes of…
Q: Name two biological processes that operate in a fixed film-growth mode?
A: This model considers secondary clarifier at a rural sewage treatment plant which is a typical phase…
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: Why does dry heat require higher temperatures for longer time periods to sterilize than moist heat
A: Sterilization may be defined as the process which help in the complete removal of all…
Q: What technology is available for faster bacterial culture?
A: BASIC INFORMATION BACTERIA It is one of the type of biological cell. They belong to prokaryotic…
Q: Would all microorganisms exhibit the same bacterial growth curve? Why?
A: The bacterial growth curve is a closed curve, it is typical in nature for all microorganisms. All…
Q: If triclosan is the active agent in antibacterial handsoaps, what group of bacteria can grow freely…
A: Antibacterial soap is the one that contains the chemical ingredients which assist in killing the…
Q: Which of the answers below represents the correct mathematical expression of bacterial growth of…
A: The formula for bacterial growth is as follows: Nt = No × 2n Where Nt= bacterial population at time…
Q: The generation time of microbacterium cells present in activated sludge is 30 minutes. If these…
A: Introduction: Cells are the most basic and basic unit of life. So, if we dissect an organism down to…
Q: Why are agar plates incubated upside down?
A: The Petri dish has existed for over a decade, whereas simple, cell-growing equipment remains…
Q: How would light shone on one side of the Winogradsky column influence the growth of microorganisms?
A: Microbiology is the study of microscopic organisms, such as bacteria, viruses, archaea, fungi and…
Q: Which environment would a microaerophilic bacterium like the best?
A:
Q: Why do petroleum-degrading bacteria need to attach to thesurface of oil droplets?
A: Petroleum is a crucial strategic resource and all countries compete fiercely for it. The…
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: If you were using the quadrant streak plate method to plate a very dilute broth culture (with many…
A: Streak plate technique is the technique or method that is widely used for the isolation of a pure…
Q: Tell me three things about microbial metabolism and growth?
A: Microbial metabolism refers to how a microorganism acquires the energy and nutrients (such as…
Q: Which type of bacteria survive more easily in dry environments? Question 4 options: gram…
A: Bacteria are small prokaryotic unicellular organisms. They have different abilities to resist…
Question 2
A specimen transferred onto a fresh agar plate is initially in which phase of bacterial growth?
Question 2 options:
a)
Exponential
b)
Death
c)
Lag
d)
Stationary
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- What did pasteur prove when he showed that a cotton plug that had filtered air would trigger microbial growth when transferred to a sterile medium?what argument made previously was he addressingA microbiologist used the concept of enrichment culture to isolate aerobic and anaerobic nitrogen-fixing bacteria, sulfate-reducing bacteria, and sulfur-oxidizing bacteria. What kind of selective media could he haveused for isolating each of these four classes of microbes?Why would farmers be concerned about nitrifying bacteria?
- If the original number of cells in a sample was 12,000, how many bacteria will be present in 12 hours when the generation time is 15 minutes?An attempt to transfer bacteria into new media during the death (Decline) phase of a culture resulted in actual growth of the organisms. What is the most likely explanation of this phenomenon?Which of the following agents if introduced into a growing culture of bacteria would halt growth but if removed would allow growth to continue? A) Antiseptic B) Bacteriostatic agent C) Disinfectant D) Bactericidal agent E) Sterilizing agent
- As a microbiology student, how can you prevent or control coliform contamination in drinking water of your respective communityAfter inoculating and incubating an agar slant from a pure broth culture of a bacterial species such as E. coli, which of the following would indicate an unsuccessful aseptic transfer? (Choose ALL that apply) a - There is fungal growth in the original broth culture tube. b- There is too much growth on the agar slant. c- There are colonies of similar morphology on the slant. d - There are red, yellow, and white colonies on the slant. e - There is no growth on the slant.How does the growth rate of a specific bacterium impact how easy or difficult it is to treat clinically?
- What is the advantage of the plating method over an electronic cell counting method in counting cells? Why does turbidity lose reliability at high cell concentrations when the culture reaches the stationary phase?Do you think scientists working at Pitch Lake were at a great risk ofinfection from the organisms growing in the lake? Explain.Which of the following types of bacteria can contaminate water sources in hospitals and also cause pulmonary diseases or infections? Question 9 options: Mycobacterium spp. Hydrobacterium spp. Escherichia coli Shigella spp.