List two characteristics of genetic code.

Explanation

To answer the question about the characteristics of the genetic code, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Codons**:
- The genetic code is composed of codons, which are sequences of three nitrogenous bases (nucleotides). Each codon corresponds to a specific amino acid or a stop signal during protein synthesis.

2. **Characteristic 1: Unambiguous**:
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