The human pancreas contains beta cells that produce the hormone insulin which regulates sugar levels in the blood. Why is the production of insulin limited to the pancreas?
A) The gene coding for insulin is only present in the beta cells of the pancreas
B)The gene coding for insulin is only expressed in the beta cells of the pancreas
C) The gene coding has a different nucleotide sequence in other cells of body than it does in beta cells of pancreas
D) The gene coding replicates into mRNA in all cells but can only be transcribed into proteins in beta cells of pancreas
