The bacterium Agrobacterium infects plants and causes plant cells to develop tumorlike cellular structures and begin synthesizing sets of proteins that protect the bacterium from the plant immune response, as well as synthesize nutrients that can be used exclusively by the bacterium. Researchers testing the efficacy of two new antibiotic treatments against Agrobacterium are tasked with designing an experiment to test their effectiveness. Which of the following describes the most appropriate dependent variable in this experiment? A B C D the rate of infection the amount of treatment the number of formed tumors the rate of plant growth

The bacterium Agrobacterium infects plants and causes plant cells to develop tumorlike cellular structures and begin synthesizing sets of proteins that protect the bacterium from the plant immune response, as well as synthesize nutrients that can be used exclusively by the bacterium. Researchers testing the efficacy of two new antibiotic treatments against Agrobacterium are tasked with designing an experiment to test their effectiveness. Which of the following describes the most appropriate dependent variable in this experiment? A B C D the rate of infection the amount of treatment the number of formed tumors the rate of plant growth

Comprehensive Medical Assisting: Administrative and Clinical Competencies (MindTap Course List)

6th Edition

ISBN:9781305964792

Author:Wilburta Q. Lindh, Carol D. Tamparo, Barbara M. Dahl, Julie Morris, Cindy Correa

Publisher:Wilburta Q. Lindh, Carol D. Tamparo, Barbara M. Dahl, Julie Morris, Cindy Correa

Chapter42: Basic Microbiology

Section: Chapter Questions

Problem 2CR

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During quorum sensing, bacteria sense their populationdensity by:(a) Secretion of inducer molecules that become effectivewhen a sufficient amount is secreted(b) Detection of compression from neighboring cells(c) Detection of nutrient depletion(d) Mobilization of sentry cells that circle the periphery ofthe colony
Suppose you have a bacterium, which is normally killed in an hour when growing in a medium containing penicillin. This bacterium is an auxotroph and requires tryptophan for growth. When placed in a medium lacking both tryptophan and penicillin, the bacterium neither grows nor dies for several hours. Question: Is it killed in an hour in a medium lacking tryptophan but containing penicillin? (Yes/No and explain briefly why).
Below is a diagram of four different antibiotics (numbered 1-4) that are being tested in a petri dish inoculated with bacteria. After a sufficient incubation period, bacterial growth occurred except in the zones of inhibition (shown with dotted lines in the diagram) around the antibiotics. Based on the results shown here, would it be reasonable to conclude that the most effective antibiotic in this example would be an effective antibiotic against any bacterium? Why or why not?
Most ecosystems on Earth rely on sunlight as the primary energy source for the synthesis of organic compounds that living organisms need. Sunlight does not penetrate deep enough in the ocean to provide energy for organisms living near hydrothermal vents. How can these densely populated communities survive without energy from the sun? A. chemoheterotrophic bacteria convert organic compounds into carbon dioxide which is used by other organisms as an energy source B. chemoautotrophic bacteria harvest chemical energy from hydrogen sulfide and then provide the basis of food for the vent communities C. chemoheterotrophic bacteria harvest chemical energy from hydrogen sulfide and then provide the basis of food for the vent communities D. chemoautotrophic bacteria fix nitrogen which then is used as a source of energy for other organisms
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If a bacterial species is not susceptible to an antibacterial drug at the concentration present in a particular disk, does that necessarily mean the species is completely resistant to the drug? Explain your answer. Did you notice any colonies (isolated mounds of cells) growing within any of the zones of inhibition? If so, which plate(s) and which drug(s)? What would cause growth of colonies within a zone of inhibition? please answer both questions.
You're in charge of bioremediation of jet fuel-contaminated soil. Your colleague advises that you add nitrogen and phosphate to the soil to encourage the development of naturally existing hydrocarbon-degrading bacteria. However, you've just read about a new microbe slurry containing nutrients and a surfactant that's being marketed. What information do you need to gather in order to choose the best course of action? How are you going to get these numbers?
Mention and describe the two types of bacterial resistance to antibiotics. And which of the following elements isn't consider a macronutrient?
We are looking for bacteria that can grow with ribose sugar as the only carbon source. Several specimens of bacteria have been sampled from the soil. Pure cultures from each sample are plated on general purpose media (which includes commonly used sugars like glucose), and onto plates containing only ribose as a carbon souce. Which of the following is true? (Consider the entire statement.) The ribose plates are selective - the bacterial colonies on these plates can be compared to those growing on the general purpose plates to look for differences in colony appearance. The ribose plates are differential - the bacterial colonies on these plates can be compared to those growing on the general purpose plates to look for differences in colony appearance. The ribose plates are differential - only bacterial colonies able to use ribose as a carbon source will grow on those plates. The ribose plates are selective - only bacterial colonies able to use ribose…
A. Antibiotics, such as gentamicin, are used in media to prevent growth of susceptible microbes. Is gentamicin media a selective, differential or enrichment media? B. Sorbitol is a sugar alcohol that all Escherichia bacteria can normally ferment into an acidic waste compound. This acidic end product is detected by including a pH indicator in the agar and noticing a color change. The strain of Escherichia that is a common food pathogen, E. coli O157:H7, however can not ferment sorbitol. It will grow similar to other E. coli, but not change the agar color. Is sorbitol in nutrient agar a selective, differential or enrichment media?
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When a test tube of bacteria is treated with penicillin and left for two days, the bacteria were found to still be growing and the a changed form of penicillin is found inside of the bacterial cells. What mechanism of antibiotic resistance is likely to have occurred?