How DNA Is Copied: Base Pairing and Replication | Year 12 Biology

Full lesson, notes and practice questions: https://hscscience.com.au/subjects/bi... Explain how a cell copies billions of DNA letters almost without error. Name the parts of a DNA nucleotide, pair A with T and C with G, and explain why one strand acts as a template for the other. Trace a short molecule through semi-conservative replication, where each new molecule keeps one original strand, and explain why copying errors are rare. 0:00 How cells copy DNA 0:52 Base pairing 2:38 Replication steps 3:43 Copy a DNA molecule 5:34 Copying errors and repair 6:34 Practice questions 7:24 Working through the answers 9:11 Key notes Biology 2017: Year 12 Module 5, Heredity. Supports modelling DNA replication using the Watson and Crick model, including nucleotide composition, pairing and bonding. Syllabus dotpoint (NSW Biology Stage 6, 2017, Module 5): "model the processes involved in cell replication, including but not limited to: mitosis and meiosis (ACSBL075) DNA replication using the Watson and Crick DNA model, including nucleotide composition, pairing and bonding (ACSBL076, ACSBL077)" Official 2017 course: https://www.nsw.gov.au/education-and-... Prerequisite: DNA as inherited information, genes, alleles and copying errors, and how a single cell copies its DNA before it splits. Next: Mitosis, how a cell shares its copied chromosomes between two new cells. #Year12Biology #DNA #HSCScience