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TLS Online TPP Program

#Question id: 4018

How does binding of the lac repressor to the lac operator block transcription initiation?

#Unit 3. Fundamental Processes

  1. lac repressor binding blocks RNA polymerase from interacting with DNA at the start site.

  2. lac repressor binding induces a DNase that cleaves the DNA at the transcription start site.

  3. lac repressor binding causes a conformational change in RNA polymerase.

  4. lac repressor binding induces a protease that degrades the sigma subunit of RNA polymerase.

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TLS Online TPP Program

#Question id: 11294

#Unit 10. Ecological Principles

A small lake has three trophic level – Phytoplankton(autotroph) , Zooplankton (herbivore ) and planktivorous fish ( primary carnivore) . In to this lake Population of some other primary carnivore introduced to study top down effect . What is expected long term consequence of this  introduction ?
TLS Online TPP Program

#Question id: 11295

#Unit 10. Ecological Principles

The amount of energy entering a food chain depends on the
TLS Online TPP Program

#Question id: 11296

#Unit 10. Ecological Principles

Which of the following statements is true?
TLS Online TPP Program

#Question id: 11297

#Unit 10. Ecological Principles

What is the difference between gross and net primary production?
TLS Online TPP Program

#Question id: 11298

#Unit 10. Ecological Principles

A pyramid of numbers shows _____________.
TLS Online TPP Program

#Question id: 11299

#Unit 10. Ecological Principles

Carbon is initially incorporated into the food chain by _____________