Final answer:
The statement is false. Not all eukaryotic mRNA is derived from hnRNA.
Step-by-step explanation:
The statement that all eukaryotic mRNA is derived from heterogeneous nuclear (hn) RNA is False.
While it is true that eukaryotic pre-mRNAs undergo several processing steps before they can be translated, including splicing and modification, not all eukaryotic mRNA is derived from hnRNA. Pre-mRNAs are synthesized as longer precursors and undergo processing to become mature, functional mRNA.