alleryStart learning →Reading an mRNA colinearly, nucleotides 4 to 6 of the coding sequence specify which amino acid of the protein?
AThe first amino acid
BThe fourth amino acid
CThe sixth amino acid
DThe second amino acid
Answer & Solution
Correct answer: D. The second amino acid
1. Translation is colinear, so consecutive triplets specify consecutive amino acids.
2. Nucleotides 1 to 3 correspond to amino acid 1.
3. Nucleotides 4 to 6 are therefore the second triplet and correspond to amino acid 2.
4. Counting nucleotides rather than triplets is the trap that produces the answers of fourth or sixth.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 15 "Genes and Proteins", section 15.1 The Genetic Code_
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