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The flow of genetic material in microbial cells usually takes place from

  • A.RNA through DNA to proteins
  • B.proteins through RNA to DNA
  • C.DNA through RNA to proteins
  • D.none of these

Answer: C

Correct answer: DNA through RNA to proteins

This is the central dogma: DNA is transcribed to RNA and RNA translated to protein. Retroviruses reverse the first step with reverse transcriptase, but no mechanism translates protein back into nucleic acid, and it is that last impossibility which gives the dogma its force.

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