Describe the structure and function of DNA.
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DNA (deoxyribonucleic acid) is a double-stranded helix composed of nucleotides, which include a sugar (deoxyribose), a phosphate group, and one of four nitrogenous bases (adenine, thymine, cytosine, or guanine). The strands are complementary and anti-parallel, with adenine pairing with thymine and cytosine pairing with guanine. DNA’s structure enables it to store genetic information, which is used to guide the synthesis of proteins and regulate cellular processes. DNA replication ensures that genetic information is accurately passed on during cell division.