Articles > Codon definition – quiz Codon definition – quiz Quiz Choose the best answer. 1. What is a codon? A sequence of three nucleotides A sequence of two nucleotides A single nucleotide None 2. A codon codes for ... an amino acid a fatty acid a nucleotide None 3. Where is codon found? rRNA mRNA tRNA None 4. Cysteine encoded by either UGU or UGC indicates that ... the genetic code is devoid of any punctuation the genetic code is non-overlapping the genetic code is degenerate None 5. Which biological process are codons used for? Carbohydrate synthesis Lipid synthesis Protein synthesis None Send Your Results (Optional) Your Name To Email Time's up