BIO 121 Chapter Notes -Dna Replication, Telomere, Nucleoid
Document Summary
Two antiparallel sugar-phosphate chains wind around the outside of the molecule; the nitrogenous bases project into the interior, where they hydrogen-bond in specific pairs, a with t, g with c. Timeline: 1866- gregor mendel published the results of his investigations of the inheritance of. Hydrogen bonding- between specific pairs; binds two chains of helix. Hydrogen bonds are weak, allowing dna to unzip easily. A & t forms two bonds, g & c forms 3 bonds: backbone of dna chain, alternating sugar and phosphate groups, joined by covalent bonds. Structure: double helix, chains run side by side, antiparallel, one is going one way, the other is going the other way, 5" end phosphate attatched o 5" deoxyribose carbon, 3" end hydroxyl attatched to 3" deoxyribose carbon. Semiconservative replication: each daughter double helix consists of 1 original strand from parent and 1 new complementary strand. In mismatch repair, enzymes correct errors that persist.
