In Early Experiments, a Polymer of Uracil, UUUUUUUU…, Translated into a Peptide

Multiple Choice

In early experiments, a polymer of uracil, UUUUUUUU…, translated into a peptide comprising only phenylalanine amino acids. What did this observation demonstrate?

A) Uracil is not a functional nucleotide.
B) UUU codes for phenylalanine.
C) RNA cannot be faithfully translated in vitro.
D) No other amino acid codon contains uracil.