Question

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

Explanation:

To determine which RNA carries genetic instructions for protein building, we analyze each type:

• tRNA (transfer RNA): Transfers amino acids during translation, not carrying genetic instructions.
• rRNA (ribosomal RNA): Part of ribosomes, involved in protein synthesis structure, not carrying instructions.
• mRNA (messenger RNA): Copies DNA's genetic code and carries it to ribosomes for protein synthesis.

So only mRNA carries the genetic instructions for building a specific protein. The other options include tRNA or rRNA, which do not carry the instructions.

Answer:

C. mRNA only (Note: Assuming the options are labeled as A: tRNA and rRNA, B: mRNA and tRNA, C: mRNA only, D: rRNA only. If the original options have different labels, adjust accordingly, but the correct content is "mRNA only".)