Final answer:
The purpose of mRNA is to transfer genetic information from DNA, which cannot exit the nucleus, to the ribosomes in the cytoplasm where protein synthesis takes place. The correct answer is (c) RNA; DNA.
Step-by-step explanation:
The purpose of messenger RNA (mRNA) is to transfer the original message of DNA to the ribosome because the two-stranded nucleic acid cannot leave the nucleus. The correct answer to the question is option (c) RNA; DNA. DNA is housed within the nucleus, and while it contains the instructions for protein synthesis, it cannot leave the nucleus. Therefore, mRNA, a single-stranded nucleic acid, is synthesized from DNA and carries the genetic code out of the nucleus into the cytoplasm. There, the mRNA interacts with ribosomes, which are made up of rRNA (ribosomal RNA) and proteins, to facilitate the translation process where proteins are synthesized according to the sequence coded in the mRNA.