* tRNA's Role: tRNA molecules act as "molecular couriers" carrying specific amino acids to the ribosomes during protein synthesis.

* Ribosomes in Cytoplasm: Ribosomes, the protein-making machinery, are located in the cytoplasm (and sometimes attached to the endoplasmic reticulum).

* Nuclear Function: The nucleus is the site of DNA transcription, where the genetic code is copied into messenger RNA (mRNA). mRNA then travels to the cytoplasm to direct protein synthesis.

Therefore, tRNA needs to be in the cytoplasm to interact with the ribosomes and mRNA, facilitating the translation of genetic information into proteins.