The agar turns pink because the enzyme produces which causes a pH change to Ammonia, alkaline OA. Putrescine, acidic O B. Putrescine, alkaline OC. Ammonia, acidic

Q: If the result of an unknown bacteria is “poor growth” and “red growth,” can this result be…

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

Q: A culture of E. coli has a concentration of 5 x 108 cells/mL. How many times do you have to dilute…

A: Given: 1. Number of colonies: 2502. No. of bacteria in culture: 5 X 108 3. Volume plated: 0.1 ml 4.…

Q: Two different bacterial samples, A and B, were inoculated onto SIM media. What can you conclude…

A: SIM (Sulfide, Indole and Motility) test is done to differentiate the Gram negative bacilli based on…

Q: O O What is the component in a biochemical media test responsible to inhibit a certain group of…

A: Biochemical tests are helpful in identification of bacterial species by separating them on the…

Q: Which characteristic of the species used determines whether sterility was achieved when autoclaved?

A: Microorganism: These are too small organism which is impossible to see by naked eyes. They exist in…

Q: Why does motility media contain a lower amount of agar than ordinary agar?

A: Agar is a phyco-colloid polymer of galactose monomers obtained from red algae (Gelidium and…

Q: CITRATE UTILIZATION TEST WAS PERFORMED IN A CULTURE MEDIA WHICH CONTAIN A STRONG BUFFER. AND EVEN A…

A: In this test citrate agar is used, where citrate is carbon source and NH4and ability of organism to…

Q: Give two ways to prevent the diffusion of oxygen into the medium in this test.

A: The main two ways to prevent the diffusion of oxygen are given below.

Q: Why is there a need to filter the alkaline solution after adding the Barium chloride solution?

A: In an aqueous solution, barium chloride acts as a simple salt.  However when dissolved in water, it…

Q: You inoculate a species of bacteria on a MacConkey agar which normally shows positive growth and the…

A: MacConkey Agar (MAC) is selective and differential agar that is used to isolate non-fastidious…

Q: Jessie is working with a 100% stock concentration of Clorox. She decides to add 100 μL of bacteria…

A: For calculating the unknown concentration of the tube we will be using the formula as mentioned…

Q: Explain why litmus milk is considered a good differential medium.

A: Differential media are the growth medium that helps in differentiating bacterial samples on the…

Q: Why do the results for the confirmed test represent  faecal coliform in the analysis of water using…

A: MPN is Most probable number. It is commonly applied for testing the quality of water.

Q: what type of bacteria would be used to make sauerkraut?

A: Sauerkraut is product of cutting raw cabbage that fermented by various lactic acid bacteria. The…

Q: Nitrate reduction test can be used to differentiate between Pseudomonads and Enterobacteriaceae. You…

A: The nitrate reduction test is used to differentiate between Pseudomonads and Enterobacteriaceae or…

Q: Why does the nitrate reduction tube turn red after the addition of zinc?

A: Nitrate reduction test is used to find the bacteria who have the ability to reduce the nitrate.

Q: Describe how each of the following would appear when grown on EMB agar: a. Escherichia coli b.…

A: EMB stands for Eosin Methylene Blue. This media is used as a seletive stain for the gram negative…

Q: In the amino acid decarboxylase test (lysine decarboxylase), we added mineral oil to the tube before…

A: Introduction The Lysine Decarboxylase Test Is Based On Some Bacteria's Capacity To Convert L-lysine…

Q: where 5 nutrient agar pates per female student and 3 agar slants per males student are needed to…

A: It is given that 5 nutrient agar plate prepared by per female so Seven female will prepare=7*5=35…

Q: Is the Peptone Iron Agar (PIA) a complex or defined medium? Explain based on its composition. Is the…

A: Depending on their composition, media can be classified as defined and undefined media. Defined…

Q: Identify the oxidase-negative, gram negative bacillus isolated from the blood cultures of a…

A: Gram-negative bacteria are those that do not retain the crystal violet stain after gram staining.…

Q: In some cases, why does a chemical is more effective as a microbicide  when it is diluted rather…

A: An antimicrobial is an agent that kills microorganisms or stops their growth. Antimicrobial…

Q: For each of the following situations, describe how bacteria on these growth media would appear on…

A: In this examination, we will explore the appearance of bacterial growth on various growth media…

Q: why do We need to Wait for the iron Agar to set and then Add another thin layer of 45°C Iron Agar?

A: The test that uses iron agar is the Triple Sugar Iron (TSI) Test and is used to determine the…

Q: The arrowhead shaped zone shows what reaction? How do you set up the test for this reaction? For…

A: INTRODUCTION Clostridium perfringens is a normal bactetia seen  in large intestine of humans and…

Q: Why are petri dishes ALWAYS stored and incubated upside down?   Question 17 options:   a)  helps…

A: ANSWER) Petri dish is a transparent dish which is shallow and is used with the purpose of holding…

Q: The Bradford reagent gives a linear response only from 0.1 mg/mL to 1.4 mg/mL of protein…

A: There are several biochemical tests that are used to determine the concentration of protein in a…

Q: Can you describe a situation where high-level disinfection would be needed? Medium-level? Low-level?

A: Disinfection is the process in which pathogenic microorganisms are eliminated by means of chemical…

Q: Cytopathic effects (CPE) are visible changes in cells due to: A)viral infection B)mutations…

A: Cytopathic effects are structural changes in a cell which can be easily viewed under a compound…

Q: Does this source pass the CRAPP test? In what way?…

A: Solution:The source, titled "The Effectiveness of Mindfulness-Based Stress Reduction on the…

Q: You inoculate a species of bacteria on a MacConkey agar. It normally shows positive for growth and…

A: MacConkey Agar is a differential agar for Lactose fermentation while if no other Sugars are used,…

Q: Why do we add powdered zinc to the nitrate reduction test?

A: Bacteria are prokaryotic simple unicellular organisms. Their mode of respiration may be aerobic or…

Q: In the traditional alkaline lysis method, what is the purpose of Solution 2? For what is its use?

A: Solution 2 is a critical component of the alkaline lysis method, as it provides the harsh conditions…

Q: What is the substrate(s) that will be used by the microorganism to produce the calcite ?

A: Biomineralization is the process by which microorganisms and other living organisms directly or…

Q: in the isolation of alkaloid,in the early stages of acid or base required conditions. explain the…

A: Alkaloids are secondary metabolites derived through shikimic acid pathway. They are nitrogen…

Q: If ABG sample is not properly iced, what effect will this have on the results?

A: The amounts of oxygen and carbon dioxide in our blood are measured by an arterial blood gas (ABG)…

Q: After filtering off the yeast in a difficult process, using a Celite pad to the filtrate which…

A: Celite is a substance that is most commonly used for the purpose of filtration. Celite is composed…

Q: How can organisms develop resistance to chemical disinfectants?

A: Bacteria can develop resistance to disinfectants over time either by acquisition of exogenous mobile…