List several features about the genetic code.

List several features about the genetic code.

• A. Degenerate
• B. Non-overlapping
• C. Universal
• D. All of the above

Answer: (D)

The genetic code has several defining features that ensure accurate translation across many organisms. Degeneracy means multiple codons can specify the same amino acid, providing redundancy. This often occurs with variation at the third nucleotide of a codon, so synonymous changes can occur without altering the amino acid. Non-overlapping means the code is read in consecutive, separate triplets; each nucleotide belongs to one codon only, so shifting the reading frame disrupts all downstream codons. Universality means the same code is used by virtually all organisms, allowing genes to be transferred and expressed across species, with only a few well-known exceptions in mitochondria and certain protists. Because the code exhibits all of these properties, the best description is that it encompasses all of these features.

The genetic code has several defining features that ensure accurate translation across many organisms. Degeneracy means multiple codons can specify the same amino acid, providing redundancy. This often occurs with variation at the third nucleotide of a codon, so synonymous changes can occur without altering the amino acid. Non-overlapping means the code is read in consecutive, separate triplets; each nucleotide belongs to one codon only, so shifting the reading frame disrupts all downstream codons. Universality means the same code is used by virtually all organisms, allowing genes to be transferred and expressed across species, with only a few well-known exceptions in mitochondria and certain protists. Because the code exhibits all of these properties, the best description is that it encompasses all of these features.