Which of the following is observed in prokaryotes but not in eukaryotes?

A) UGG is an example of a stop codon only found in prokaryotes.
B) An mRNA can be translated by only one ribosome at a time in prokaryotes.
C) The 5´ end of a prokaryotic mRNA can be translated while the 3´ end is still being transcribed.
D) Translation does not require any protein factors in prokaryotes.
E) In prokaryotes, ribosomes move along an mRNA in the 3´ to 5´ direction.