Answer:
- DNA
- mRNA
- tRNA
Step-by-step explanation:
- DNA is only ever found inside the nucleus- it is too big to exit the nuclear membrane
- tRNA is only ever found outside the nucleus- it constructs proteins by coding for chains of amino acids, and this happens in the cytoplasm, not the nucleus
- mRNA moves between the nucleus and the cytoplasm, transferring the genetic code of the DNA to the tRNA to facilitate protein construction