Question

a sequence of three nitrogenous bases can specify the identity of ________.
○ a single dna molecule
○ a specific peptide chain
○ a single amino acid
○ a specific gene
○ i dont know yet

Explanation:

In genetics, a codon (a sequence of three nitrogenous bases in DNA or RNA) codes for a single amino acid. A single DNA molecule is too large to be specified by three bases, a specific peptide chain is made of multiple amino acids (coded by multiple codons), and a specific gene has many codons. So the correct option is the one about a single amino acid.

Answer:

C. a single amino acid (assuming the options are labeled A to E with C being "a single amino acid" as per the order: A. a single DNA molecule, B. a specific peptide chain, C. a single amino acid, D. a specific gene, E. I DON'T KNOW YET)