Concept explainers
Why do you expect colonies on the ampicillin agar to fluoresce?
To determine:
The reason for observation of the green fluorescent on ampicillin agar plate.
Introduction:
The gfp or the green flouroscent protein is a 238 amino acid long amino acid first isolated from Aequorea Victoria (avGFP). The GFP gives aa green fluorescent in visible light and blue fluorescent in UV. The GFP is very important for the microbial study as it allows tagging of protein and associated products and genes.
Explanation of Solution
In case, the ampicillin resistant genes is labelled as fluorescent, then on ampicillin rich agar, this gene will be expressed. The expression of the ampicillin resistance gene will cause the gfp protein to be expressed as a result green fluorescent will be observed.
Want to see more full solutions like this?
Chapter 29 Solutions
Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
- You found a bright blue growth on a tomato you had left on your kitchen counter. You’ve never seen a microorganism that color, and you want to know what it is. You take the tomato into the lab, sterilize an inoculating loop, transfer a sample from the tomato to a Nutrient Agar Petri dish, and incubate it at 37°C. But when you come back two days later, your Petri dish is empty. Why might this be? Be specific about what might have happened. How would you test your hypothesis?arrow_forwardWhy did you perform the catalase test on colonies growing on nutrient agar plates but not on the blood agar plates?arrow_forwardUsing your fingers, you are asked to aseptically touch the surface of a sterile agar plate. Illustrate the possible result from this step if your fingers are (a) unwashed – touched various things prior to placing on agar surface, and (b) washed with soap or disinfected with 70% alcohol. Describe the relative abundance of microbial growth observed on the plates. List and draw the possible characteristics of an isolated bacterial colony that can be observed based on type of (a) margin, (b) elevation, (c) texture, and (d) optical property.arrow_forward
- Why is oil immersion necessary to see bacteria in the laboratory?arrow_forwardWhat is the benefit of using LB (Lysogeny broth) medium for the growth of E. coli, Bacillus subtilis and Pseudomonas putida? Why ?arrow_forwardIn 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?arrow_forward
- How can moist heat sterilization can sterilize antibiotic solution?arrow_forwardWhy are the streak plates for microorganisms in coconut water incubated at 7°C?arrow_forwardIn an experiment, the bacteria were placed in dropper bottles containing glycerol as a carbonsource. Why did the culture have to be incubated for an hour in the new media?arrow_forward
- Inoculate one colony from LB plate into 5 mL LB liquid medium. Shake at 37 °C overnight. Why inoculate from just a single colony?arrow_forwardOn which of the following types of media would you expect untransformed bacteria to grow on? LB agar LB agar with ampicillin Untransformed bacteria will not grow on any type of medium. Untransformed bacteria will grow on all three types of media. LB agar with ampicillin and arabinosearrow_forwardWhy would you use one single colony for both streaks on a plate and inoculate a culture for plasmid purification?arrow_forward