Chapter 9 DNA and the Molecular Structure of Chromosomes

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Chapter 9 and some of 8DNA and the Molecular
Structure of Chromosomes
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The Structures ofDNA and RNA

• DNA is usually double-stranded, with adenine
  paired with thymine and guanine paired with
  cytosine. RNA is usually single-stranded and
  contains uracil in place of thymine.

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nucleotide sugar base phosphate
nucleoside sugar base
When Do we Find RNA Mixed with The DNA?
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Ribonucleotide Reductase
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Pyrimidines have the longer name and smaller
base Purines have the shorter name and bigger base
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Structure of aPolynucleotide Chain
Why do we Always talk about DNA going in the 5
to 3 direction?
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Deoxyribonucleotides
What is dideoxyadenosine triphosphate (ddATP)?
Why are dideoxynucleotides useful in Mol.Bio.?
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I hate when DNA is not depicted properly!
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Standard 4 exon gene


-Where is the polyA tail in the gene above? -Draw
a 4 exon gene where exon 4 is all 3UTR
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