Nucleic acids

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Nucleic acids
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• Nucleic Acids

__________________________
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Nucleic Acids

• Function
• _______________________
• ________________________
• genes
• blueprint for building proteins
• DNA ? RNA ? proteins
• ________________________
• blueprint for new cells
• blueprint for next generation

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Nucleic Acids

• Examples
• ________ (ribonucleic acid)
• single helix
• ________ (deoxyribonucleic acid)
• double helix
• Structure
• monomers ________________

RNA
DNA
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Nucleotides

• 3 parts
• _____________ (C-N ring)
• _____________(5C)
• ribose in RNA
• deoxyribose in DNA
• _____________________

Nitrogen baseIm the A,T,C,G or Upart!
Are nucleic acidscharged molecules?
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Types of nucleotides
Purine AG Pure silver!

• 2 types of nucleotides
• different nitrogen bases
• _________________
• double ring N base
• ________________
• ________________
• _________________
• single ring N base
• ________________
• ________________
• ________________

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Nucleic polymer

• Backbone
• sugar to PO4 bond
• _______________________
• new base added to sugar of previous base
• polymer grows in one direction
• N bases hang off the sugar-phosphate backbone

Dangling bases?Why is this important?
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Pairing of nucleotides

• Nucleotides bond between DNA strands
• H bonds
• purine pyrimidine
• __________
• 2 H bonds
• __________
• 3 H bonds

Matching bases?Why is this important?
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DNA molecule

• Double helix
• ____________ between bases join the 2 strands
• A T
• C G

H bonds?Why is this important?
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Copying DNA

• Replication
• ______________________________________________
• have one, can build other
• have one, can rebuild the whole

Matching halves?Why is this a good system?
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When does a cell copy DNA?

• When in the life of a cell does DNA have to be
  copied?
• ____________________
• ________________
• ____________________
• ________________

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DNA replication

• It has not escaped our notice that the specific
  pairing we have postulated immediately suggests a
  possible copying mechanism for the genetic
  material.
• James Watson
• Francis Crick
• 1953

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Watson and Crick and others
1953 1962
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Maurice Wilkins and
1953 1962
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Rosalind Franklin (1920-1958)
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Interesting note

• Ratio of A-TG-C affects stability of DNA
  molecule
• 2 H bonds vs. 3 H bonds
• biotech procedures
• more G-C need higher T to separate strands
• high T organisms
• many G-C
• parasites
• many A-T (dont know why)

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Another interesting note

• ATPAdenosine triphosphate

• modified nucleotide
• adenine (AMP) Pi Pi

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HELIXHELIX
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• Macromolecule Review

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Carbohydrates

• Structure / monomer
• monosaccharide
• Function
• energy
• raw materials
• energy storage
• structural compounds
• Examples
• glucose, starch, cellulose, glycogen

glycosidic bond
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Lipids

• Structure / building block
• glycerol, fatty acid, cholesterol, H-C chains
• Function
• energy storage
• membranes
• hormones
• Examples
• fat, phospholipids, steroids

ester bond (in a fat)
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Proteins

• Structure / monomer
• amino acids
• levels of structure
• Function
• enzymes u defense
• transport u structure
• signals u receptors
• Examples
• digestive enzymes, membrane channels, insulin
  hormone, actin

peptide bond
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Nucleic acids

• Structure / monomer
• nucleotide
• Function
• information storage transfer
• Examples
• DNA, RNA

phosphodiester bond