Question

which type of rna carries genetic instructions for building a specific protein?
mrna only
trna and rrna
mrna and trna
rrna only

Explanation:

Messenger RNA (mRNA) is transcribed from DNA and contains the genetic code for building a specific protein. Transfer RNA (tRNA) helps in bringing amino - acids to the ribosome during translation, and ribosomal RNA (rRNA) is part of the ribosome structure. The key is that only mRNA carries the genetic instructions for building a specific protein.

Answer:

A. mRNA only