What is a codon?

What is a codon?

• A. A single nucleotide in RNA
• B. A sequence of three nucleotides that codes for an amino acid
• C. A type of protein structure
• D. A segment of DNA that codes for a protein

Answer: (B)

A codon refers specifically to a sequence of three nucleotides in messenger RNA (mRNA) that encodes for a specific amino acid during protein synthesis. Each of the twenty amino acids is represented by at least one unique codon, which is part of the genetic code. This triplet code is crucial in the process of translation, where the sequence of codons in the mRNA is read by ribosomes to assemble amino acids into a polypeptide chain, ultimately folding into a functional protein. The significance of codons extends to their role in the universality of gene expression across different organisms and the redundancy of the genetic code, where multiple codons can correspond to the same amino acid. This three-nucleotide sequence ensures precise timing and coordination in protein synthesis, which is vital for proper functioning of cellular processes and maintaining life. This understanding elucidates the importance of codon structure and function in molecular biology and genetics, emphasizing why the provided answer is correct.

A codon refers specifically to a sequence of three nucleotides in messenger RNA (mRNA) that encodes for a specific amino acid during protein synthesis. Each of the twenty amino acids is represented by at least one unique codon, which is part of the genetic code. This triplet code is crucial in the process of translation, where the sequence of codons in the mRNA is read by ribosomes to assemble amino acids into a polypeptide chain, ultimately folding into a functional protein.

The significance of codons extends to their role in the universality of gene expression across different organisms and the redundancy of the genetic code, where multiple codons can correspond to the same amino acid. This three-nucleotide sequence ensures precise timing and coordination in protein synthesis, which is vital for proper functioning of cellular processes and maintaining life.

This understanding elucidates the importance of codon structure and function in molecular biology and genetics, emphasizing why the provided answer is correct.