Question

transcription and translation
what is a codon?
○ a type of rna that copies instructions from a portion of dna
○ a sequence of three bases that codes for a protein
○ a portion of dna that codes for a specific protein
○ a sequence of three bases that codes for an amino acid

Explanation:

A codon is a sequence of three nucleotides (bases) in mRNA (messenger RNA). Each codon corresponds to a specific amino acid. For example, the codon AUG codes for the amino acid methionine (which also serves as a start codon). The first option describes mRNA (not a codon). The second option is incorrect as a codon codes for an amino acid, not a protein (proteins are made of multiple amino acids). The third option describes a gene (a portion of DNA coding for a protein), not a codon.

Answer:

a sequence of three bases that codes for an amino acid