For each of the following gene parts, state whether deleting 1 nucleotide will most likely make (A) more protein, (B) less protein, (C) a different protein, (D) nothing is made and (E) nothing changes at all. Explain. 
a. promoter

b. exon-nothing is made

c. intro-nothing changes at all

d. enhancer (switch)-more protein

e. repressor (switch) -less protein