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Explore how reading the language of DNA brings us close to understanding the secret of life in this second lecture from Walter Bodmer's 1984 Christmas Lectures series at The Royal Institution. Delve into the complex chemical makeup of living matter, from simple molecules like salts, sugars and fats to the intricate structures of proteins and DNA that form the foundation of all life. Discover how proteins serve as both the building blocks of living material—including collagen in skin, keratin in hair, and muscle protein—and as functional molecules like hemoglobin that carries oxygen and enzymes that process food. Learn about DNA's role as the ultimate chemical of life, housed in chromosomes and structured as a double helix that explains cellular division, one of life's most fundamental properties. Understand how the four basic building blocks of DNA translate through the genetic code into the 20-letter language of proteins, and how even a single change in the 3 billion letter DNA sequence can cause devastating diseases by producing abnormal, non-functional proteins. Trace the connection between genetic diseases and their molecular origins, following the path from observable symptoms in patients down to specific changes in DNA language and chromosomes, demonstrating how deciphering this genetic code brings us closer to unlocking life's deepest secrets.
