PPT-Molecular biology DNA Replication

Lecture 4 DNA replication Before each cell division new copies must be made of each of the many molecules that form the cell including the duplication of all DNA molecules DNA replication . GO TO . BIOINTERACTIVE WEBSITE. DNA replication questions. Why is DNA replication so important?. In what part of the cell cycle does DNA replication occur?. What enzyme brings in the new DNA nucleotides that form complimentary pairs with the old DNA strand?. WHAT YOU WILL LEARN. -process of DNA making copies . -role of enzymes in copying DNA. -leading and lagging strands in DNA replication. READING Q. ’. s . 1-LIST:. -the 3 phases of semi-conservative replication. 20.1 part 2. DNA replication. Earlier on in this unit we learned about mitosis or cell division.. In order for mitosis to occur and chromosomes to duplicate themselves, the DNA must copy itself exactly.. Models of DNA replication: Meselson-Stahl Experiment. DNA synthesis and elongation. DNA polymerases. Origin and initiation of DNA replication. Prokaryote/eukaryote models (circular/linear chromosomes). Learning Objectives. What happens during DNA replication?. How is a new polynucleotide strand formed?. Why is DNA replication known as ‘semi-conservative’?. Putting What We’ve Learnt So Far In To Context.... The function of DNA in the cells is to. preserve genetic information.. transfer genetic information to new cells as the strands of DNA are copied.. DNA Replication. In . DNA replication. ,. the strands in the original or parent DNA molecule separate to allow the synthesis of complementary DNA strands.. DNA REPLICATION. DNA IS COPIED. 1. DURING . S-phase. of . INTERPHASE. PREPARATION FOR CELL DIVISION. SEPARATION. 2. THE . STrAND. OF DNA IS . UNZIPPED. BY . HELICASE. 3. THE POINT OF SEPARATION IS CALLED THE . Dr. Kevin Ahern. Structure. Structure. Structure. One Strand of DNA. Structure. Introduction. Structure. Introduction. DNA Structure. DNA Forms. Semi-Conservative Replication. Discontinuous. Replication. . Understanding DNA structure and replication is a prerequisite for understanding/using the principal tools of molecular biology . R. R. 0. R0. R0. 0. R0. R0. R. 0. R. RR. R0. 0. R0. 00. DNA: Structure & Replication. Something to think about... When a species . reproduces. , there is . genetic continuity . maintained from one generation to the next.. WHAT . is responsible for this continuity?. HOW . does this continuity happen?. BIOLOGY SECOND CLASS HAIDER ALNAJI ISLAMIC UNIVERSITY DEPARTMENT OF CLINIC AL LABORATORY INVESTIGA TION TECHNIQUES 4 Molecular Biology Lecture 4 : DNA Replication Haider Alnaji 20 Part 1 Moleculer ;. . the. . study of . biology. at the . molecular. level.. Molecular biology. ;. . the. . study of . gene . structure and functions at the . molecular level. . to understand the molecular basis of hereditary, genetic variation, and the expression patterns of genes. . . DNA . replication occurs in all living organisms acting as the most essential part for biological inheritance. This is essential for cell division during growth and repair of damaged tissues, while it also ensures that each of the new cells receives its own copy of the DNA. . What is DNA?. DNA is a . Nucleic Acid in the nucleus. Polymer of . Nucleotides. Each nucleotide consists of. Deoxy. ribose (5-carbon sugar) . Phosphate group. a nitrogen-containing base. Four bases.