Question

Какими триплетами нельзя кодировать аминокислоту?Какие аминокислоты нельзя кодировать стартовым кодОм???????

Answer 1

УГА, УАГ, УАА -  ЭТИМИ НОНСЕНС КОДОНАМИ триплетами нельзя кодировать аминокислоту

Answer 2

Triplet Encoding of Amino Acids

When it comes to encoding amino acids, the genetic code uses a set of three-letter sequences called codons. Each codon corresponds to a specific amino acid or a stop signal. However, not all combinations of triplets can encode amino acids. Some triplets are reserved as stop codons, while others are not used at all.

1. Triplets that cannot encode amino acids: There are three triplets that do not code for any amino acid and are known as stop codons. These triplets signal the end of protein synthesis. The stop codons are:

- UAA - UAG - UGA

2. Amino acids that cannot be encoded by a start codon: A start codon is the initiation signal for protein synthesis. In the standard genetic code, the start codon is AUG, which codes for the amino acid methionine. However, there are some amino acids that cannot be encoded by a start codon. These amino acids include:

- Selenocysteine (Sec) - Pyrrolysine (Pyl)

Selenocysteine and pyrrolysine have unique mechanisms for their incorporation into proteins and require specific sequences and factors beyond the standard start codon AUG.

Please note that the information provided above is based on the standard genetic code. There are variations in the genetic code among different organisms, and some organisms may have different start codons or use alternative codons for certain amino acids.