Structure of DNA and RNA

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Created by tiasabs over 4 years ago
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Topic 2.6 Structure of DNA and RNA of IB Biology Chapter 2 Molecular Biology

Resource summary

Structure of DNA and RNA
1 Nucleic acids and nucleotides
1.1 nucleic acids DNA and RNA polymers of nucleotides
1.2 first discovered in materials extracted for cell nuclei
1.3 Nucleic acids = large molecules made by linking nucleotides to form polymer
1.4 parts of a nucleotide
1.4.1 pentose sugar; 5 C atoms
1.4.2 phosphate group; negatively charged; acidic
1.4.3 base; contains N; 1 or 2 rings of atoms
1.5 base and phosphate group linked to sugar by covalent bonds
1.6 strong backbone; sugar phosphate structure
1.7 4 diff bases = 4 diff nucleotides
1.8 any base sequence possible; stores genetic info
2 Differences between DNA and RNA
2.1 number of strands present
2.1.1 DNA = 2
2.1.2 RNA = 1
2.2 base composition
2.2.1 DNA = adenine, cytosine, guanine, thymine
2.2.2 RNA = uracil instead of thymine
2.3 type of pentose
2.3.1 DNA = deoxyribose
2.3.2 RNA = ribose
3 Structure of DNA
3.1 strands wound; double helix
3.2 antiparallel (opposite) strands of nucleotides
3.3 linked by hydrogen bond b/ween complementary pars
3.4 each strand, chain of nucleotides; covalent bond
3.5 complementary base pairing
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