(a) (b) FIGURE 11.24 Bioluminescent Bacteria (a) Plate culture of bioluminescent bacteria. (b) Flashlight fish; under the eye is a light organ colonized with bioluminescent bacteria. COM
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What role does quorum sensing play in bioluminescence?
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- Nitrogen fixing bacteria can use atmospheric nitrogen as their sole source of nitrogen. Imagine you are trying to select only nitrogen fixing bacteria from a soil sample. Could the sample be grown on a complex medium? Explain why or why not.When we grow bacteria on TSA plates for 5 days, we see mostly vegetative cells. Why?Where you can find bacteria ?enlist it? Mention the reason why bacteria is present everywhere?
- Your right-handed TA has pressed her hands onto agar plates. There are four plates total--left hand palm, left hand top, right hand palm, right hand top. They are incubated for growth. Which one of the four plates would you expect to contain the most diverse bacteria? Why? What factors contribute to differences you might see between the plates? Which two plates would you expect to be the most similar to each other? Why?What is the difference between a bactericidal antibiotic and an antibiotic that is bacteriostatic? Examine the zone of inhibition around each disk for the presence of micro colonies within the zone. What do these micro colonies represent? Why didn't plants evolve anti-microbial agents against all the microbes in their environment?Nitrogen and phosphorus added to beaches following an oil spill encourages the growth of natural oil degrading bacteria. Explain why the bacteria do not grow if nitrogen and phosphorus are not added?
- Streak plate allows microbiologists to isolate one species of bacteria from another. Why is that important?Why is a microtome an indispensable tool in a Microtechnique laboratory?The bacteria which oxidize various inorganic substancesand use the released energy for the synthesis of food arecalled _______________.(a) Archaebacteria(b) Heterotrophic bacteria(c) Photosynthetic autotrophic bacteria(d) Chemosynthetic autotrophic bacteria Please try to break the solutions into as many steps as practically possible and the steps should come one by one and they should be short and crisp and plagiarism-free.
- Escherichia coli but not Pyrolobus fumarii will grow at 40°C,while P. fumarii but not E. coli will grow at 110°C. What ishappening (or not happening) to prevent growth of eachorganism at the nonpermissive temperature?Name bacteria a, b and c. How do plants obtain their nitrogen? How do animals obtain their nitrogen? Name two plants that have nodules on their roots. Name the three ways atmospheric nitrogen can be changed to nitrates. Why do all livings things need nitrogen? In what type of environmental conditions do bacteria B thrive in?Do some research and describe two or three scenarios in which it would be preferable to use a stab tube vs. a growth plate. (Hint: What do bacteria use to help them move? Can motility be used to help identify many medically important pathogenic bacteria such as the Enterobacteriaceae?)