Question

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

Explanation:

• mRNA (messenger RNA): Transcribes the genetic code from DNA in the nucleus and carries it to ribosomes in the cytoplasm for protein synthesis. It directly carries the genetic instructions for building a specific protein.
• tRNA (transfer RNA): Brings amino acids to the ribosome during translation. It does not carry the genetic instructions for building the protein but rather helps in assembling the protein based on the mRNA code.
• rRNA (ribosomal RNA): Forms part of the ribosome structure. It is involved in the catalytic process of protein synthesis (e.g., peptidyl - transferase activity in forming peptide bonds) but does not carry the genetic instructions for the specific protein sequence.

Answer:

mRNA only