BIOL 103 Lecture Notes - Lecture 24: Dna Ligase, Dna Replication, Nitrogenous Base

• School: George Mason University
• Department: Biology
• Course: BIOL 103
• Professor: chaitanyaravi

Document Summary

Double helix is shown through the ribbon model. A new strand is built mitosis and meiosis. 10. 2 dna and rna are polymers of nucleotides. The monomer unit of dna and rna is the nucleotide, containing the sugar-phosphate backbone: nitrogenous base. Pyrimidines: thymine and cytosine: 5-carbon sugar, phosphate group. The sugar-phosphate backbone is on the outside. The nitrogenous bases are perpendicular to the backbone in the interior. 10. 4 dna replication depends on specific base paring. Each strand is used as a pattern to produce a complementary strand, using specific base pairing: daughter strand. Each new dna helix has one old strand with one new strand. 10. 5 dna replication proceeds in two directions at many sites simultaneously. Dna replication begins at the origins of replication: dna unwinds at the origin to produce a bubble, replication proceeds in both directions for the origin and ends when products from the bubbles merge with each other.