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
Step by step
Solved in 2 steps with 2 images
- Why are petri dishes ALWAYS stored and incubated upside down? Question 17 options: a) helps bacteria grow b) the lid is larger and make the dish more stable c) prevents condensation from dripping on to agar surface d) so the label can be seenA culture with approximately 4x105 cells/mL were incubated. After 10 hours, the number of cells had increased to 5x109. a) How long was the generation time in minutes?b) How many generations have occurred?You inoculated a culture with an initial cell count of 6.5x10^3 cells. The generation time for this organism is 25 minutes. You grew the culture for 10 hours. a) How many generations occurred?b) How many cells will be present after the 10 hours?
- Question 16 Within the context of infectious disease, which of the following specimens would be considered irretrievable? Question 16 options: a) Wound swab b) Blood sample for therapeutic drug monitoring c) Cerebrospinal fluid d) Urine sampleQuestion 68Chlamydia trachomatis is a: Question 68 options: a) Gram-negative, obligate intercellular bacteria b) Gram-negative facultative intracellular bacteria c) Gram-negative, obligate intracellular bacteria d) Gram-negative, facultative intercellular bacteriaFirst image has info to answer second image question. Possible answers are A) The altered bacterium is no longer lactose intolerant B) The altered bacterium is no longer able to use glucose as a food source C) Permease is likely to be produced continuously
- There are two cultures of yeast cells in the pictures, one has been incubated for 6 hours and one has been incubated for 24 hours. After a 10x dilution by taking 100µl of each culture and adding it to 900 µl water in a microcentrifuge tube and 100µl sample from the tube was taken to view in the counting chamber. a) Count the total number of yeast cells for each culture respectively b) Calculate the concentration and density of yeast cells for each culture respectivelyYou are given a 1 gram soil sample of unknown bacterial load. After doing 10-fold serial dilutions of the soil in sterile water, 100 uL volumes are taken from each dilution for preparation of pour plates. Following incubation, each half of the 10-8 plate has 46 colonies.a) What was the dilution factor?b) How many bacteria were present in the soil?2. Staphylococcus aureus divides every 20 minutes. A culture begins with 10 bacterial cells.a) After 5 hours, how many generations have occurredb) After 5 hours, how many bacteria are present?3. How many milliliters would you need to prepare a 10-2 dilution from a 10ml starting culture?Question 15 Which of the following agents used for routine hand hygiene in health care settings is most bactericidal and least irritating to the skin? Question 15 options: a) Alcohol-based handrub b) Chlorhexidine handwash c) Plain soap and water d) Antimicrobial soap and water
- The Petri Dish method is used in microbiology to raise bacteria in: a) rapid growth b) pure culture c) septic environment d) all of the above 2. What is the difference between antiseptic and sanitization?3. In order to prevent any kind of contamination the medium must be _________ before placing it in the Petri dish. a) lyophilized b) pasteurized c) autoclaved d) distilleQUESTION 13 13. How many minutes is an acceptable time for a centrifuge to spin blood specimens? a) 10 - 15 minutes b) 5 - 8 minutes c) 20 - 25 minutes d) 25 - 30 minutes QUESTION 14 1. What are the types of centrifuges? a)swinging-bucket or angled b)Fixed-head rotor c) Ultra-centrifuges d) all the answer are correct.Question 14 If a suspect bacterial pathogen infecting your patient is known to be "fastidious" which medium would you grow this pathogen on? selective media such as MacConkey agar enrichment medium such as blood agar differential medium such as MSA O all purpose medium such as SAB Question 15