You receive a bacterial culture in the lab and your job is to figure out information which will be helpful. You are only allowed to use one of the staining methods we practiced. Which one would be the best option? Why? And what will this information help you determine? Explain.
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Q: layer
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A: Option b
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Q: What stain technique is used here? What is the primary stain, mordant, decolorizing agent, and…
A: What stain technique is used here? What is the primary stain, mordant, decolorizing agent, and…
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- An acid-fast staining method was performed on a bacterial smear using the dyes carbolfuchsin and methylene blue. The resulting stained slide contained only cells that appeared blue when visualized using a microscope. Which of the following could explain why only blue cells were present? No acid-fast bacteria are present on the slide Methylene blue was not used Carbolfuchsin was not used Acid-alcohol was not usedWhy are basic dyes more effective for bacterial staining than acidic dyes? State two ways that can confirm whether a bacterial smear has been correctly prepared or not. Why should you be careful not to underheat a smear during the heat-fixing process? Why do you think the presence of grease or dirt on a glass slide will result in a poor smear preparation? Cite two or three reasons.Which of the following is/are true regarding the acid-fast stain? (There may be more than one correct answer.) Non-acid-fast microbes appear blue in a completed acid-fast stain. O Acid-fast cells retain the primary dye after treatment with acid-alcohol. O It is used to identify members of the genus Mycobacterium. V Acid-fast cells appear bright pink/red in a completed acid-fast stain. O If cells are acid-fast, they are gram-negative.
- In the preparation of a bacterial smear, why is there a need to fix the bacteria to the slide? Aside from passing the slide over a flame, what are the other ways of fixing the bacteria to the slide?After performing the gram stain you observe your result as gram negative. To help confirm this result what type of method (besides the gram stain) could you perform? Please explain why, the result you would want to observe and the interpretation of the result.The unknown observations are shown as a mixed stain, gram positive, and gram negative. The next images shows the chart of what we can choose from for the gram positive bacterial stain. We are allowed to choose 4 test or stains that we would like to use to preform to identify the unknown.
- Based from the results obtained from Gram staining, explain why bacterial cells retained or changed their color. Briefly explain the principle behind the procedure. Cite advantages of differential staining method (Gram staining and endospore staining) over simple staining only. List other staining methods aside from those you performed in the laboratory. conclusion:You are performing a Gram stain on Gram-negative bacteria, and you stop after the addition of the alcohol. What is the appearance of the bacteria at this point? ○ pink ○ colorless ○ blue ○ purpleThe acid-fast bacterium, Mycobacterium smegmatis, is relatively safe to be used by students in performing the acid-fast stain technique because of its thin cell wall. However, if this organism is used for Gram-stain, it can also take the Gram stain reaction. Why is this so?
- The first step in identifying an organism from a pure working culture is to perform a(n) __________ test. acid-fast staining negative staining endospore staining simple staining Gram stainYou have performed an experiment and your aim is to obtain pure colonies. However, you observe some colony variations and you need to verify that this is not due to contamination, name and describe the staining method would you use to achieve this goal?The acid-fast stain is used to stain _____. The decolorizer used to destain the cells is ______. Positive cells that retain the primary stain are ______, while negative cells are counterstained with _____ and will have a ______ color. *Please use answers from the options provided in the image below.