Asked by kelvin calin
Read the article to learn more about the types of RNA, specifically mRNA and tRNA. Use the information to answer the following question.
RNA
Explain the roles of mRNA and tRNA in protein synthesis.
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Answered by
GPT-5 mini
AI
- mRNA (messenger RNA)
- Carries the genetic instructions copied from DNA into a linear sequence of codons (triplets of nucleotides). Each codon specifies one amino acid (or a stop signal).
- In eukaryotes mRNA is processed (5′ cap, splicing, poly-A tail) and exported from the nucleus to the cytoplasm; in prokaryotes it is often translated directly.
- During translation the ribosome reads the mRNA codons in order and uses that sequence to determine the amino acid sequence of the protein.
- tRNA (transfer RNA)
- Acts as the adaptor that translates codons into amino acids. Each tRNA has a three-base anticodon that pairs with a complementary mRNA codon and a 3′ acceptor stem (CCA) where a specific amino acid is attached.
- Amino acids are covalently attached to the correct tRNA by aminoacyl-tRNA synthetases (one enzyme per amino acid), producing “charged” tRNAs.
- In the ribosome tRNAs deliver their amino acids: an incoming charged tRNA enters the A site, its anticodon base-pairs with the mRNA codon, the growing peptide is transferred to that amino acid (peptide bond formation), the ribosome translocates, and the uncharged tRNA exits (E site).
Together: mRNA provides the template (the sequence), and tRNAs bring the correct amino acids as specified by that template so the ribosome can assemble them into a polypeptide in the proper order.
- Carries the genetic instructions copied from DNA into a linear sequence of codons (triplets of nucleotides). Each codon specifies one amino acid (or a stop signal).
- In eukaryotes mRNA is processed (5′ cap, splicing, poly-A tail) and exported from the nucleus to the cytoplasm; in prokaryotes it is often translated directly.
- During translation the ribosome reads the mRNA codons in order and uses that sequence to determine the amino acid sequence of the protein.
- tRNA (transfer RNA)
- Acts as the adaptor that translates codons into amino acids. Each tRNA has a three-base anticodon that pairs with a complementary mRNA codon and a 3′ acceptor stem (CCA) where a specific amino acid is attached.
- Amino acids are covalently attached to the correct tRNA by aminoacyl-tRNA synthetases (one enzyme per amino acid), producing “charged” tRNAs.
- In the ribosome tRNAs deliver their amino acids: an incoming charged tRNA enters the A site, its anticodon base-pairs with the mRNA codon, the growing peptide is transferred to that amino acid (peptide bond formation), the ribosome translocates, and the uncharged tRNA exits (E site).
Together: mRNA provides the template (the sequence), and tRNAs bring the correct amino acids as specified by that template so the ribosome can assemble them into a polypeptide in the proper order.
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