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Structure of
DNA and RNA
- Nucleic acids and nucleotides
- nucleic acids DNA
and RNA polymers
of nucleotides
- first discovered in materials
extracted for cell nuclei
- Nucleic acids = large
molecules made by linking
nucleotides to form polymer
- parts of a nucleotide
- pentose sugar;
5 C atoms
- phosphate group;
negatively charged; acidic
- base; contains N; 1
or 2 rings of atoms
- pentose sugar;
5 C atoms
- base and phosphate
group linked to sugar
by covalent bonds
- strong backbone; sugar
phosphate structure
- 4 diff bases = 4
diff nucleotides
- any base sequence
possible; stores genetic info
- nucleic acids DNA
and RNA polymers
of nucleotides
- Differences between DNA and RNA
- number of strands present
- DNA = 2
- RNA = 1
- DNA = 2
- base composition
- DNA = adenine, cytosine, guanine, thymine
- RNA = uracil instead of thymine
- DNA = adenine, cytosine, guanine, thymine
- type of pentose
- DNA = deoxyribose
- RNA = ribose
- DNA = deoxyribose
- number of strands present
- Structure of DNA
- strands wound; double helix
- antiparallel (opposite) strands of nucleotides
- linked by hydrogen bond
b/ween complementary pars
- each strand, chain of
nucleotides; covalent bond
- complementary base pairing
- strands wound; double helix
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