OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

What is the function of the triplet code?

1. To determine the size of proteins

2. To represent one amino acid

3. To sequence DNA

4. To regulate enzyme activity

The correct answer is: To represent one amino acid

The triplet code refers to the set of three nucleotides in DNA or RNA that correspond to a specific amino acid in the synthesis of proteins. Each triplet, also known as a codon, is essential because it provides the instructions for assembling amino acids in the correct order, ultimately forming proteins. Proteins are made up of chains of amino acids, and the sequence of these amino acids determines the protein's structure and function in the organism. This code is fundamental to genetic coding, as it translates the genetic information stored in nucleic acids into the functional molecules required for various biological processes. The triplet nature of the code allows for a vast array of combinations, ensuring the diversity of proteins that can be synthesized based on the genetic information. Therefore, representing one amino acid through a specific combination of three nucleotides is the correct interpretation of the function of the triplet code.