How long does it take to make an mRNA RNA polymerase copies

How long does it take to make an mRNA?

RNA polymerase copies DNA and adds RNA nucleotides at a rate of 40-80 nts/sec. Using an average rate of 60 nt/sec, how long does it take to make one mRNA of length 1022 nts? How does this compare to the time to make the protein it codes for? Is there a big difference?

Solution

RNA polymerase copies DNA and adds RNA nucleotides at a rate of 60 nt/sec,

So, it takes 17.03 sec to make one mRNA of length 1022 nts

In humans, it takes about 20 mins for transcription and 90sec for translation (to code and translate 450 amino acids on average). Thus, Translation takes less time than transcription.