hooboo

It means there are many introns (ie, bits of the gene that aren't transcribed). 749 aa means 749 x 3 base pairs in the mature mRNA. Which means a good portion of the 80k bp were not transcribed (about 97%), and hence not translated to aa. You can also inf...

There are 20 amino acids. If you had codons of two nucleotides, would there be a sufficient number of codons to code for 20 amino acids?

Insulin. Wiki it. The insulin gene is spliced into an e. coli plasmid.