Unit 2: Molecular Genetics Bi 1d: Central Dogma Bi 5a: DNA, RNA, protein structure and function Bi 5b: Base pairing rules.

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Presentation transcript:

Unit 2: Molecular Genetics Bi 1d: Central Dogma Bi 5a: DNA, RNA, protein structure and function Bi 5b: Base pairing rules

proteins DNA  Function:  genetic material ▪ stores information ▪ genes ▪ blueprint for building proteins  DNA  RNA  PROTEINS ▪ transfers information ▪ blueprint for new cells ▪ blueprint for next generation

 Examples:  RNA (ribonucleic acid) ▪ single helix  DNA (deoxyribonucleic acid) ▪ double helix  Structure:  monomers = nucleotides RNADNA

 3 parts  nitrogen base (C-N ring)  pentose sugar (5C) ▪ ribose in RNA ▪ deoxyribose in DNA  phosphate (PO 4 ) group Are nucleic acids charged molecules? Nitrogen base I’m the A,T,C,G or U part!

 2 types of nucleotides  different nitrogen bases  purines ▪ double ring N base ▪ adenine (A) ▪ guanine (G)  pyrimidines ▪ single ring N base ▪ cytosine (C) ▪ thymine (T) ▪ uracil (U) Purine = AG Pure silver!

 Backbone  sugar to PO 4 bond  phosphodiester bond ▪ new base added to sugar of previous base ▪ polymer grows in one direction  N bases hang off the sugar-phosphate backbone

 Nucleotides bond between DNA strands  H bonds  purine :: pyrimidine  A :: T ▪ 2 H bonds  G :: C ▪ 3 H bonds Matching bases? Why is this important?

 Double helix  H bonds between bases join the 2 strands ▪ A :: T ▪ C :: G H bonds? Why is this important?

 Replication  2 strands of DNA helix are complementary ▪ have one, can build other ▪ have one, can rebuild the whole Matching halves? Why is this a good system?

 When in the life of a cell does DNA have to be copied?  cell reproduction ▪ mitosis  gamete production ▪ meiosis

“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

 DNA composition: “Chargaff’s rules”  varies from species to species  all 4 bases not in equal quantity  bases present in characteristic ratio ▪ humans: A = 30.9% T = 29.4% G = 19.9% C = 19.8% 1947 That ’ s interesting! What do you notice? Rules A = T C = G

 Ratio of A-T::G-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 (don’t know why)

proteinRNADNA transcriptiontranslation replication  Flow of genetic information in a cell Where do these processes occur in the cell?