A. E. coli RNA polymerase adds ribonucleotides to an RNA strand
at a rate of 25 per second. The average size of the transcribed
region of a bacterial gene is 1200 bp. How long (in seconds) will
it take RNA polymerase to complete transcription of an
average-sized gene?

B. The average size of the transcribed region in a human gene is
15,000 bp. Assuming that a eukaryotic RNA polymerase adds
ribonucleotides at the same rate as E. coli RNA polymerase, how
long (in minutes) will it take the RNA polymerase to complete
transcription of an average human gene?

C. The transcribed region of the largest human gene is 2,500,000
bp. Assuming that a eukaryotic RNA polymerase add ribonucleotides
at the same rate as E. coli RNA polymerase, how long (in hours)
will it take the RNA polymerase to complete transcription of this
gene? (Round off to the nearest hour.)