a) The amino acid sequence of the alpha chain terminates with a *.  What does this symbol mean? b) In your own words describe the function of the signal peptide and its final fate in post transcriptional modification. c)How many amino acids form the precursor of insulin (preproinsulin)?  d) Since the C-peptide is cut out of proinsulin to create the final mature insulin (B-chain and A-chain) what role do you think the C-peptide might play in the biosynthesis of the mature insulin protein?

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a) The amino acid sequence of the alpha chain terminates with a *.  What does this symbol mean?

b) In your own words describe the function of the signal peptide and its final fate in post transcriptional modification.

c)How many amino acids form the precursor of insulin (preproinsulin)? 

d) Since the C-peptide is cut out of proinsulin to create the final mature insulin (B-chain and A-chain) what role do you think the C-peptide might play in the biosynthesis of the mature insulin protein?

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