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klasskru [66]
3 years ago
5

Amino acids are coded for by triplet bases in RNA called _____

Biology
2 answers:
lutik1710 [3]3 years ago
8 0
Triplet bases in RNA called codons
svlad2 [7]3 years ago
3 0
1. Three nucleotides encode an amino acid. Proteins are built from a basic set of 20 amino acids, but there are only four bases. Simple calculations show that a minimum of three bases is required to encode at least 20 amino acids. Genetic experiments showed that an amino acid is in fact encoded by a group of three bases, or codon. 

<span>2. The code is nonoverlapping. Consider a base sequence ABCDEF. In an overlapping code, ABC specifies the first amino acid, BCD the next, CDE the next, and so on. In a nonoverlapping code, ABC designates the first amino acid, DEF the second, and so forth. Genetics experiments again established the code to be nonoverlapping. </span>



<span>3. The code has no punctuation. In principle, one base (denoted as Q) might serve as a “comma” between groups of three bases. </span>

<span>This is not the case. Rather, the sequence of bases is read sequentially from a fixed starting point, without punctuation. </span>





<span>4. The genetic code is degenerate. Some amino acids are encoded by more than one codon, inasmuch as there are 64 possible base triplets and only 20 amino acids. In fact, 61 of the 64 possible triplets specify particular amino acids and 3 triplets (called stop codons) designate the termination of translation. Thus, for most amino acids, there is more than one code word.</span>
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