What is the three-base code in DNA that directs the order of amino acids in a protein?

• A. Transcription
• B. Amino acid sequence
• C. Genetic code
• D. Allelic sequence

Answer: (C)

The three-base code in DNA that dictates the order of amino acids in a protein is known as the genetic code. The genetic code is composed of codons, which are sequences of three nucleotides. Each codon corresponds to a specific amino acid or a stop signal during protein synthesis. This code is universal and ensures that the same codon will direct the synthesis of the same amino acid, regardless of the organism, highlighting the fundamental nature of genetic language in all living things.

In this context, while transcription refers to the process of copying DNA into RNA, it does not directly represent the three-base code itself. The amino acid sequence is an end result of the genetic code but does not define the code. An allelic sequence pertains more to variations of genes and does not relate directly to the coding aspect of amino acids. Thus, the term genetic code specifically captures the essence of the question regarding the directive role of the three-base sequences in amino acid ordering.