Lecture4_09 - 4/9/2010 Chapter 22 DNA: Deoxyribonucleic...

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4/9/2010 1 Chapter 22 DNA: Deoxyribonucleic Acid: Found within cell nucleus Storage and transfer of genetic information Passed from one cell to other during cell division RNA: Ribonucleic Acid: Occurs in all parts of cell Primary function is to synthesize the proteins All nucleic acids are polymers in which the monomer units are nucleotides.
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4/9/2010 2 A nucleotide is a three-subunit molecule in which a pentose sugar is bonded to both a phosphate group and a nitrogen-containing heterocyclic base. Phosphate Sugar Base The sugar unit of a nucleotide is either the pentose ribose or the pentose 2’ -deoxyribose. In RNA the sugar unit is ribose, and in DNA the sugar unit is 2’ -deoxyribose. Pentose Sugar
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4/9/2010 3 Five nitrogen-containing heterocyclic bases are nucleotide components. Three are derivatives of pyrimidine, and two are derivatives of purine. Both of these heterocyclic compounds are bases because they contain amine functional groups. Nitrogen-Containing Heterocylic Bases
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Lecture4_09 - 4/9/2010 Chapter 22 DNA: Deoxyribonucleic...

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