Which of the following would suggest your stock culture is contaminated? Gram stain indicates Gram-positive bacilli. Broth media become turbid. Gram stain indicates both Gram-positive cocci and Gram-negative bacilli. Colony morphology is uniform on the streak isolation plate. Gram stain indicates Gram-positive staphylococci.

Q: Pathogen population size correlates with the severity of an infection. What is the most inexpensive,…

A: To quantify bacteria, we can use methods like:Plate Counting (CFU): Dilute and plate samples, count…

Q: A patient enters the clinic demonstrating signs and symptoms of meningitis.  A spinal tap is…

A: Meningitis is the infection that affects the delicate membranes called meninges that cover the…

Q: Peptidoglycan on bacterial cell walls is stained by crystal violet dye and for this reason those…

A: True

Q: layer

A: The crystal violet eventually escapes from cytoplasm of the cell, if left too long for…

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: You have a culture that has 5 X103 cfu/ml of bacteria in it. You perform a serial dilution by adding…

A: In microbiology and bacteriology, the technique of serial dilution is a fundamental method used to…

Q: When you interpret a Gram-stained smear, you should also describe the morphology (shape) of the…

A: Bacteria These are prokaryotic organisms which kack membrane bound organelles. Through the technique…

Q: STREPTOCOCI Gram positive cocci in chains, spherical to ovoid Catalase (-) Non-motile ; Capnophilic…

A: STREPTOCOCCI They are gram positive  cocci arranged in chains or pairs . They are members of the…

Q: Which of the following plates (dilution factor) would you count/use to determine the original…

A: The colony-forming unit is the estimated number of bacterial cells in the culture that are viable…

Q: Imagine a microbiologist performed a series of Gram stains but forgot to perform the destain step…

A: Bacteria are prokaryotic organisms that contain cell walls. Bacteria are further divided into…

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: aseptic technique and pure culture technique

A: The aseptic technique is a fundamental practice in microbiology aimed at preventing the introduction…

Q: n a culture tube labeled X as your unknown. Outline the 7 steps that will enable you to determine…

A: Being able to differentiate microorganism species is very important for a number of reasons, from…

Q: What specifically causes colonies of lactose fermenters to be pink-red on MacConkey agar?

A: MacConkey agar is a selective media and a differential media that is used for isolation and…

Q: All of the following are correctly matched and can be found in bacteria EXCEPT: None of the other…

A: Note : Dear student as per our guidelines we are supposed to answer only one of your questions. So…

Q: How would you grow a streptomycin-resistant strain E. coli bacteria was spread on both agar plates…

A: Bacterial resistance does have the capacity where bacteria will withstand the effects of antibiotics…

Q: A Gram stain indicates purple cells that are round and attached in chains. Which of the following…

A: Gram staining is a simple technique, in which two categories of bacteria are identified based on…

Q: 1. You are given a 1 gram soil sample of unknown bacterial load. After doing 10-fold serial…

A: Serial dilution is a fundamental technique used in microbiology to obtain a precise and controlled…

Q: What color would you expect for a gram positive microorganism for each of his incorrect attempts?…

A: Gram staining is a technique which is used to identify the bacterial cell type, whether it is gram…

Q: A microbe is growing on Sabouraud dextrose agar, which has a slightly acidic pH. Which of the…

A: A culture medium contains enough nutrients for the growth of targeted or desired microbe. Different…

Q: Describe how to make bacterial culture in different media. Explain different cultural techniques…

A: The predigested protein provides nutrition for the growth of bacteria. A culture medium must contain…

Q: You have a culture of bacteria and you performed an Acid Fast staining. You see red rod-shaped…

A: Introduction -  Acid-fast staining is a differential stainingused to differentiate acid fast and non…

Q: The below  photograph shows a Gram-stained slide viewed using a light microscope set at brightfield…

A: Gram's staining is a technique used to distinguish between Gram negative and Gram positive bacteria.…

Q: Which of the following is FALSE about interpreting the results of normal microbial flora experiment?…

A: From shortly after birth until death, every human being's skin and mucous membranes are home to a…

Q: one or your lab partners has followed the rrecommended procedure of running Gram-positive and Gram…

A: Gram staining is a common laboratory test to characterize the bacteria into gram-positive and…

Q: why would selecting a colony from a blood agar plate to test with enterotube be bad

A: Selecting a colony from a blood agar plate to test with an Enterotube may not be ideal for several…

Q: Which of the following are true of the above picture? (Select all that apply.) V The bacteria are…

A: Gram-negative bacteria have a thin peptidoglycan layer which fails to retain colour after treatment…

Q: A patient sample will be analyzed. You are responsible to quantify the bacteria number. The dilution…

A: A sample of your blood, urine, skin, or any part of your body will be taken during a bacteria…

Q: Mannitol salt agar is a selective media that inhibits the growth of Gram-negative bacteria due to…

A: Mannitol salt agar is a differential as well as selective medium which is commonly used for the…

Q: A bacterial sample collected from a patient is processed using a Gram's stain. After staining, the…

A: Gram stain is a test that looks for bacteria in areas where an infection is suspected, such as the…

Q: Which of the following techniques is not used to count bacteria?         Optical density…

A: Bacterial counting can be done by via- (1) Optical density- Optical density of bacteria can be used…

Q: Picture that has dark background with red cells is the Negative stain and other picture in white is…

A: The Acid-Fast Stain is a lab test mainly used to find certain types of bacteria, like Mycobacterium…

Q: Is there a relationship between Gram staining and sensitivity to various antibacterial compounds?…

A: Gram staining is a method to identify whether a bacteria is gram positive or gram negative based on…

Q: What method of bacterial measurement does this graph represent? Is it considered direct, or…

A: Here Bacterial growth is measured in terms of absorbance so, bacterial growth is measured with the…

Q: The presence of endotoxins in a sterile fluid indicates: the presence of gram-positive cell walls…

A: Endotoxins, additionally called LPS, are the part of the external membrane of gram-negative bacteria…

Q: Which of the following media selects for gram negative bacteria by inhibiting the growth of gram…

A: Selective media:- it usually allow the growth of a particular microbe and inhibit the growth of…

Q: You collected a sample from a patient with a suspected STI. After Gram staining, you observed this…

A: The staining of bacteria is an important method of classifying the bacteria There could be multiple…

Q: Which of the following plates (dilution factor) would you count/use to determine the original…

A: Dilution factor is a measure of the decrease in concentration of a solution that occurs in a…

Q: Based on the pictures provided, tell me what I have for the gram-positive, and what I have for the…

A: Biochemical tests coupled with results of Gram stain which reveals the organisms Gram reaction and…

Q: about the Gram stain is false?   A-In the Gram stain, a dye called crystal violet is used to stain…

A: Gram staining is a differential staining method  used for differentiating bacterial species into two…

Q: Based on the pictures provided, tell me what I have for the gram-positive, and what I have for the…

A: A gram stain is a type of differential stain, which means it allows the distinction of one cell from…

Q: What is the shape of the bacteria in the pictures under microscope ( Cocci or Bacilli ) and why with…

A: Bacilli and cocci are different shaped bacteria and they named according to their shape . The…