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TLS Online TPP Program

#Question id: 18981

The pL promoter is controlled by the cl repressor protein of bacteriophage A. In practice, a temperature-sensitive mutant of the cl repressor, cl857, is generally used to regulate pL-directed transcription. Cells carrying the temperature-sensitive cl repressor are first grown at 30°C, and 42°C

#Unit 13. Methods in Biology
  1. at 30°C the cl repressor prevents transcription directed by the pL promoter
  2. at 42°C the thermosensitive cl repressor is inactivated and transcription can proceed.
  3. at 30° the thermosensitive cl repressor is inactivated and transcription can proceed.
  4. at 42°C the cl repressor prevents transcription directed by the pL promoter
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TLS Online TPP Program

#Question id: 18785

#Unit 13. Methods in Biology

Flow cytometry is based on 
TLS Online TPP Program

#Question id: 2284

#Unit 2. Cellular Organization

Because they have chloroplasts for energy production, plant cells
TLS Online TPP Program

#Question id: 18743

#Unit 13. Methods in Biology

What happens if insert DNA is cut with two different restriction enzymes at the ends?
TLS Online TPP Program

#Question id: 4301

#Unit 3. Fundamental Processes

Which of the following proteins prevents eukaryotic mRNAs from being recruited to the ribosome prior to egg fertilization
TLS Online TPP Program

#Question id: 12105

#Unit 10. Ecological Principles

A species of fish is found to require a certain water temperature, a particular oxygen content of the water, a particular depth, a rocky substrate on the bottom, and a variety of nutrients in the form of microscopic plants and animals to thrive. These requirements describe its