4/3/18.docx - Nina Addante Biology Downer TEST SECTION 3...

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Nina Addante Biology Downer 4/3/18 TEST SECTION 3 Unit 3 Points to Review What is DNA? How does DNA form double-helix structures? Where is DNA in a cell? How is DNA organized in the eukaryotic nucleus? How is DNA replicated in eukaryotes? DNA Dna is a double stranded molecule that has a twisted ladder-like appearance, termed double helix. Each strand is composed of subunits called nucleotides Nucleotides Nucleotides can be one of four different bases A, G, T, C Complementary base pairing Two strands of DNA are held together by base pairing (hydrogen bonding) between the bases of each strand The complementary base pairing rule: A always pairs with T C always pairs with G Sugar Phosphate linkage
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