What you’ll learn6 learning objectivesChoose one objective for a focused lesson, or study the complete topic.6.1.1Nucleotide structure• Nucleotide structure, including phosphorylated nucleotide ATPSyllabus objective6.1.2Purines (adenine, guanine)• Purines (adenine, guanine): double ring structureSyllabus objective6.1.3Pyrimidines (cytosine, thymine, uracil)• Pyrimidines (cytosine, thymine, uracil): single ring structureSyllabus objective6.1.4DNA double helix structure• DNA double helix structure:- Complementary base pairing between antiparallel strands (5′ to 3′ and 3′ to 5′)- Hydrogen bonding differences: C-G vs A-T- Phosphodiester bonds linking nucleotidesSyllabus objective6.1.5Semi-conservative DNA replication• Semi-conservative DNA replication during S phase:- Roles of DNA polymerase and DNA ligase- Leading strand vs lagging strand replication- DNA polymerase adds nucleotides only in 5′ to 3′ directionSyllabus objective6.1.6RNA (mRNA) structure• RNA (mRNA) structureSyllabus objective