Nucleic Acids

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Nucleic Acids
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Nucleotides 3 parts

• 5-C sugar
• Phosphate Group
• Nitrogenous Bases
• A, T, C, G

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Sing Along Songs - Row, Row, Row Your Boat

• We love DNA
• Made of nucleotides
• Sugar, Phosphate, and a base
• Bonded down one side
• Adenine with thymine make a lovely pair
• Cytosine without guanine would feel very bare.

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4 Nitrogenous Basesin DNA in RNA

• A adenine
• T thymine
• C cytosine
• G guanine

A adenine U uracil (replaces T in DNA) C
cytosine G guanine
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DNA Base Pairing

• A T (adenine with thymine)
• C G (cytosine with guanine)

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DNA and RNA

• -DNA is
• double stranded
• -Bases A-T, C-G
• -Only in nucleus
• -Deoxyribose sugar

-RNA is single stranded -Bases A-U, C-G -In
nucleus and in cytoplasm -Ribose sugar
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Nitrogenous BasesPurines two rings- AG
(silver)Pyrimidines CUT -one ring (pie)
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Nitrogenous Base

• Why is it called a base?
• Remember NH2 to NH3 (picks up H) its a weak
  base

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Nucleoside

• Nitrogenous Base Ribose Sugar (5-C)

Check your Pattern Matching pp. 9-10
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Nucleosides

• Uses in medicine as antiviral or anticancer agents

Ribasphere-a nucleoside
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Nucleotide ribose sugar phosphate nitrogenous
base
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Compare Nitrogenous Base with Nucleoside

• Guanoside (nitrogenous base of guanine ribose
  sugar)

• Guanine Nitrogenous Base

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SNEAK PREVIEW

• DNA molecule
• Sections of it are genes
• Genes are the codes that make specific amino
  acids that link together to make a protein

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Hydrogen Bonds

• Join nucleotides together

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