@gethelpwithproctoredexam: DNA (deoxyribonucleic acid) acts as the biological blueprint for every living organism. It is a polymer composed of nucleotides, each containing a phosphate group, a 2-deoxyribose sugar, and one of four nitrogenous bases. These nucleotides form a double helix, where the sugar-phosphate "backbone" supports the "rungs" made of paired bases. The genetic code is defined by strict complementary base-pairing: • Adenine (A) always pairs with Thymine (T) • Guanine (G) always pairs with Cytosine (C) Biological Functions DNA facilitates life through three primary mechanisms: 1. Replication: The ability to create exact copies of itself, ensuring genetic continuity during cell division. 2. Protein Synthesis: A two-stage process involving transcription (DNA to mRNA) and translation (mRNA to protein), which builds the functional components of the body. 3. Heredity: The transmission of genetic information from parents to offspring. Organization: Genes to Genomes To fit within the cell nucleus, DNA is highly organized: • Genes: Specific segments of DNA that provide the instructions for individual proteins. • Chromosomes: Long DNA molecules tightly coiled around histone proteins. Humans typically have 46 chromosomes. • Genome: The total collection of an organism’s genetic material, consisting of approximately 3 billion base pairs in humans. #humanbiology #biology #study #dna #nursing

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