https://www.khanacademy.org/science/biology/dna-as-the-genetic-material/dna-discovery-and-structure/v/the-discovery-of-the-double-helix-structure-of-dna 2022-09-22T01:27:37.241774086Z The discovery of the double helix structure of DNA How the double helix structure of DNA was discovered. Work of Watson, Crick, Franklin, Wilkins, and Chargaff. video https://cdn.kastatic.org/googleusercontent/Nu1myZ1Zd131-3IKC8dUtwtqqCta6MwX00wpeYfY59jbYKoWpsDMCirekr_dROR0FcuAeKx2AZ8KsWEwhpy29ef6 The discovery of the double helix structure of DNA How the double helix structure of DNA was discovered. Work of Watson, Crick, Franklin, Wilkins, and Chargaff. https://cdn.kastatic.org/ka-youtube-converted/hCUce36Ganc.mp4/hCUce36Ganc.mp4 537 DNA structure https://www.khanacademy.org/science/ap-biology/gene-expression-and-regulation/dna-and-rna-structure/v/introduction-to-nucleic-acids-and-nucleotides 2023-06-06T10:35:22.92767095Z Introduction to nucleic acids and nucleotides Nucleic acids, crucial macromolecules for life, were first discovered in cell nuclei and exhibit acidic properties. DNA and RNA, composed of nucleotide building blocks, store hereditary information. These polymers have a backbone of alternating ribose and phosphate groups, with nitrogenous bases forming ladder rungs. The sequence of nucleotides encodes genetic information, making nucleic acids fundamental to life. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/6074048f-6b8d-4794-b02a-7bb056d6dff4_1280_720_base.png Introduction to nucleic acids and nucleotides Nucleic acids, crucial macromolecules for life, were first discovered in cell nuclei and exhibit acidic properties. DNA and RNA, composed of nucleotide building blocks, store hereditary information. These polymers have a backbone of alternating ribose and phosphate groups, with nitrogenous bases forming ladder rungs. The sequence of nucleotides encodes genetic information, making nucleic acids fundamental to life. https://cdn.kastatic.org/ka-youtube-converted/hI4v7v8AdfI.mp4/hI4v7v8AdfI.mp4 355 DNA structure https://www.khanacademy.org/science/ap-biology/chemistry-of-life/nucleic-acids-ap/v/antiparallel-structure-of-dna-strands 2023-12-04T19:02:25.924542584Z Antiparallel structure of DNA strands DNA structure consists of two strands, each with a backbone of alternating phosphate and sugar groups. These strands are linked by complementary nitrogenous bases, forming a ladder-like structure. The strands are antiparallel, meaning they run in opposite directions, which is crucial for DNA replication. Sal Khan video https://cdn.kastatic.org/googleusercontent/jlVOYhrBGzFF4uavk6HLPEFezcJ4JuLlY5qyQV1xEBLQZkR_bUVOk-7iIDFFKzmKmfe1iWYRUsI8ZF4LX2aIjL_r Antiparallel structure of DNA strands DNA structure consists of two strands, each with a backbone of alternating phosphate and sugar groups. These strands are linked by complementary nitrogenous bases, forming a ladder-like structure. The strands are antiparallel, meaning they run in opposite directions, which is crucial for DNA replication. https://cdn.kastatic.org/ka-youtube-converted/0CQ5ls3Uc2Q.mp4/0CQ5ls3Uc2Q.mp4 597 DNA structure https://www.khanacademy.org/science/revision-term-1-ka-biology-grade-11/x1474e0ca4285b2f5:week-3/x1474e0ca4285b2f5:biomolecules/e/dna-structure 2026-04-08T00:36:09.500768563Z DNA structure Questions to practice DNA structure Moumita exercise https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:gene-expression-and-regulation/x230b3ff252126bb6:dna-structure-and-replication/a/dna-structure 2026-04-27T10:30:47.716252349Z Learn: DNA structure Learn about complementary nucleotide base-pairing and antiparallel strands in the DNA double helix. article