Question

which best describes a codon?
a cell structure that gives the master instructions for an organism
a segment of dna that is the basis of heredity in organisms
the sequence of three bases that codes for a specific amino acid
the basic unit of structure and function of all living things

Explanation:

A codon is a sequence of three nucleotides (bases) in mRNA (messenger RNA). Each codon codes for a specific amino acid. For example, the codon AUG codes for the amino acid methionine.

• The first option describes DNA as a whole (which contains all the master instructions for an organism), not a codon.
• The second option describes a gene (a segment of DNA that is the basis of heredity), not a codon.
• The fourth option describes a cell (the basic unit of structure and function of all living things), not a codon.

Answer:

the sequence of three bases that codes for a specific amino acid