Which four nucleotides form the genetic code within DNA?

The correct answer showcases the four nucleotides that are fundamental components of DNA: adenine (A), guanine (G), cytosine (C), and thymine (T). These nucleotides pair specifically—adenine with thymine and cytosine with guanine—forming the rungs of the DNA double helix structure.

Focusing on the selections, while some options may present variations of these nucleotides, the one that properly identifies the distinct bases is crucial. In the given answer, adenine and guanine are purines, while cytosine and thymine are pyrimidines, and together, these nucleotides encode the vast array of genetic information necessary for life processes. This pairing occurs during DNA replication and transcription, making it essential for genetic stability and information transfer between generations.

Understanding the particular roles and relationships of the nucleotides enhances knowledge of genetic coding, and it's critical for those studying agricultural biotechnology to grasp how these base pairs influence everything from plant genetics to crop improvement techniques.