which base in codons have a crucial role for determining amino acids the first, second or third
The base in the third position of a codon has a crucial role in determining the amino acid that is encoded. The first and second bases are also important, but they generally denote the same amino acid across different codons due to redundancy in the genetic code. This is known as the "wobble" position, where some variation in the third base can still specify the same amino acid.
The base in the codon that has a crucial role in determining the specific amino acid is the third base. The sequence of the three bases in a codon determines which amino acid will be incorporated into the growing polypeptide chain during protein synthesis. The first and second bases in the codon also contribute to the specificity of the amino acid, but the third base is particularly important. This is because the genetic code is degenerate, meaning that multiple different codons can code for the same amino acid. The third base often determines which specific codon will be used for a particular amino acid.
The base in the codon that has a crucial role in determining the specific amino acid is the third base. Each codon consists of three bases (A, U, G, or C) that encode for a specific amino acid. The sequence of these three bases in the mRNA determines the order in which the amino acids are assembled during protein synthesis.
To determine the amino acid encoded by a specific codon, you can use a codon table, also known as a genetic code chart. This table shows the correspondence between codons and the amino acids they encode. For example, the codon UGG always codes for the amino acid tryptophan, regardless of what the first and second bases are.
However, it's important to note that there are some exceptions and variations in the genetic code that can occur in different organisms or specific genes. In a few cases, the first or second base in the codon can also play a role in determining the amino acid. But in the vast majority of cases, it is the third base that is the most crucial for the specificity of the amino acid.