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TLS Online TPP Program

#Question id: 1042

A student complains that it makes no sense to worry about coliform bacteria in water, since we naturally possess harmless coliforms in our intestines anyway. Why do regulatory agencies worry about coliform bacteria in water supplies, then?

#Unit 4. Cell Communication and Cell Signaling

  1. The coliforms in our intestines can sometimes turn harmful, causing intestinal infections. We need to constantly be on guard against this happening. Coliforms in water might add to this potential problem.

  2. Not all coliforms are harmless and symbiotic with human beings. Some may carry genes/proteins that can make them dangerous to humans. It's best to keep coliforms OUT of our drinking water, since it's difficult to identify which ones might be harmless and which ones might be harmful.

  3. Regulatory agencies are worried that multiple types of coliforms in water might lead to greater antibiotic resistance in the bacterial populations. They try to keep them out of water to keep antibiotic resistance levels down.

  4. Regulatory agencies simply need something to do to justify their existence. There is no real danger from coliforms in water supplies.

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TLS Online TPP Program

#Question id: 18795

#Unit 13. Methods in Biology

Which of the following compound can be used as analogue to Propidium Iodide
TLS Online TPP Program

#Question id: 18796

#Unit 13. Methods in Biology

Newly replicating cell can be selectively killed by photolysis incorporating 
TLS Online TPP Program

#Question id: 18797

#Unit 13. Methods in Biology

A replicating cells that have incorporated a high level of BrdU are exposed to light, they will
TLS Online TPP Program

#Question id: 18798

#Unit 13. Methods in Biology

which of the is a fluorescent dye with a flat, planar structure that slides between the rungs of (or intercalates into) the DNA ladder in a quantitative manner frequently used in FACS.
TLS Online TPP Program

#Question id: 18799

#Unit 13. Methods in Biology

Propidium iodide-labeled cells can be identify cells within the populations are at each stage of the cell cycle. After passing through flow cytometer a graph is observed
  
In this graph A, B, C, and D represent a cell stage which are
TLS Online TPP Program

#Question id: 18800

#Unit 13. Methods in Biology

Propidium iodide-labeled cells can be identify cells within the populations are at each stage of the cell cycle. After passing through flow cytometer a graph is observed

In this double diploid cell are found at