Final answer:
The correct statement regarding RNA is that messenger RNA, transfer RNA, and ribosomal RNA play roles in protein synthesis. The other provided options are incorrect; the mRNA sequence is complementary to DNA, not every amino acid has a specific mRNA, and rRNA is not always attached to the rough ER.
Step-by-step explanation:
The correct statement regarding RNA in the presented options is that messenger RNA, transfer RNA, and ribosomal RNA play a role in protein synthesis. Messenger RNA (mRNA) carries genetic information from DNA to the cytoplasm, where it interacts with ribosomes to guide the sequence in which amino acids are assembled into proteins. Transfer RNA (tRNA) brings specific amino acids to the growing polypeptide chain as dictated by the sequence of codons on the mRNA. Ribosomal RNA (rRNA) is a major component of ribosomes themselves and plays a critical role in aligning the mRNA and the ribosomes, as well as catalyzing the formation of peptide bonds.
Contrary to the second option, the RNA base sequence is complementary to DNA's coding sequence. In RNA, the base uracil (U) is used instead of thymine (T), so the mRNA sequence complementary to the DNA sequence ATTGCA would actually be UAACGU.
The third and fourth statements are also incorrect. There is not one specific type of mRNA for each amino acid, as multiple codons can code for the same amino acid. Also, rRNA does not always attach to the rough ER; ribosomes containing rRNA can be found free-floating in the cytoplasm as well as attached to the rough ER in eukaryotic cells.