a. Very few if any eukaryotic genes contain tractswith more than 25 As or Ts in a row, yet almost alleukaryotic mRNAs have a tract with more than100 As in a row. How is this possible?b. Scientists know the nucleotide sequences that directthe termination of bacterial gene transcription, butthey generally have little idea about the nature ofthe nucleotide sequences that direct transcriptiontermination in eukaryotic cells. Explain the basisof this statement.

Question

a. Very few if any eukaryotic genes contain tracts
with more than 25 As or Ts in a row, yet almost all
eukaryotic mRNAs have a tract with more than
100 As in a row. How is this possible?
b. Scientists know the nucleotide sequences that direct
the termination of bacterial gene transcription, but
they generally have little idea about the nature of
the nucleotide sequences that direct transcription
termination in eukaryotic cells. Explain the basis
of this statement.

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