Messenger rna carries a(n) of the dna’s instructions out of the nucleus to the a) exact copy; ribosome b) transcript; ribosome c) exact copy; mitochondria d) transcript; mitochondria

The correct option for the fill in the blank is  B) Transcript, ribosome.

mRNA is formed by a template of DNA in the nucleus of eukaryotic cells. The genetic information from DNA is transferred to mRNA in process called Transcription. mRNA is transported outside nucleus and helps in protein synthesis at the site called ribosomes.

mRNA thus carries a transcript of DNA instruction out of the nucleus. It helps in the formation of synthesis at ribososme ( present in the cytoplasm of the cell).

Thus, option B) is the right answer.