A 3-nucleotide sequence in mRNA that specifies an amino acid (or stop) The genetic code: 64 codons specify the 20 amino acids; 3 are stops (UAA, UAG, UGA).

A 2-nucleotide pair in DNA that signals replication start

A 3-nucleotide sequence in mRNA that specifies an amino acid (or stop)

A 3-amino-acid sequence in a polypeptide that determines folding

A regulatory DNA element that binds transcription factors

Translation

AP Biology· difficulty 1/5

A codon is

A
$A 2-nucleotide pair in DNA that signals replication start$
B
$A 3-nucleotide sequence in mRNA that specifies an amino acid (or stop)$
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C
$A 3-amino-acid sequence in a polypeptide that determines folding$
D
$A regulatory DNA element that binds transcription factors$

Explanation

The genetic code: 64 codons specify the 20 amino acids; 3 are stops (UAA, UAG, UGA).

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