https://www.khanacademy.org/science/ap-biology/gene-expression-and-regulation/dna-and-rna-structure/a/nucleic-acids 2026-03-17T04:40:31.334379942Z Nucleic acids DNA and RNA structure and function. Nucleotides and polynucleotides. mRNA, rRNA, tRNA, miRNA, and siRNA. article 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 Nucleic acids: structure and composition https://www.khanacademy.org/science/grade-11-biology-snc-aligned/x58c107ba92d3f0b2:introduction-to-molecular-biology/x58c107ba92d3f0b2:nucleic-acids-structure-and-composition/v/nucleic-acid-structure-1 2021-05-25T21:59:59Z Nucleic acid structure 1 Efrat Bruck video https://cdn.kastatic.org/googleusercontent/c4hVLkc4n4wNCJSUGJpeEBIBPRzpJu9nAevuQdaDU3unuKqLmvHx2g31qPLcHP3TmXY7RES5LuZT0658UGBnGSQ Nucleic acid structure 1 https://cdn.kastatic.org/ka-youtube-converted/NX0ZPtB_QFY.mp4/NX0ZPtB_QFY.mp4 603 Nucleic acids: structure and composition https://www.khanacademy.org/science/biology/energy-and-enzymes/atp-reaction-coupling/v/adenosine-triphosphate 2023-12-04T19:02:25.924542584Z ATP: Adenosine triphosphate ATP, or Adenosine Triphosphate, is the energy currency in biological systems. It's made up of adenosine and three phosphate groups. Energy is stored when ATP is formed and released when it's broken down into ADP (Adenosine Diphosphate) and a phosphate group. This energy release powers various biological processes. Sal Khan video https://cdn.kastatic.org/googleusercontent/O61Rx22O0mauQRyjebWzYoMjkDqhouSnzPo32A7EKPbTVUJBAmGCAYcdEOuXEc6rgUvyWD8MmmNQZxdsmLGVHgGDWg ATP: Adenosine triphosphate ATP, or Adenosine Triphosphate, is the energy currency in biological systems. It's made up of adenosine and three phosphate groups. Energy is stored when ATP is formed and released when it's broken down into ADP (Adenosine Diphosphate) and a phosphate group. This energy release powers various biological processes. https://cdn.kastatic.org/ka-youtube-converted/PK6HmIe2EAg.mp4/PK6HmIe2EAg.mp4 379 Nucleic acids: structure and composition