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Download Unit 1 Ch. 1, 17, 18. WHAT IS BIOLOGY?
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DNA (Deoxyribonucleic Acid) What is it? Read Chap 13 How Read Chap 14 How does it work? do we know? Read 13, 14 & class notes The Central Dogma DNA makes PROTEINS and PROTEINS make LIFE The Central Dogma DNA makes PROTEINS and PROTEINS make LIFE But how? At its essence, DNA is a set of instructions for making proteins. “DNA is a cookbook and the genes are recipes” Proteins are made from different arrangements of protein building blocks called Amino Acids. There are 20 different Amino Acids. You get them from your food. So how do you change the protein in a tuna fish sandwich into human hemoglobin, hair, enzymes, etc.??? There’s a little problem here… Step 1: Transcription Copying the DNA DNA g mRNA Transcription: Copying the DNA DNAgmRNA Transcription: Copying the DNA DNAgmRNA COMPARISON OF DNA AND MESSENGER RNA Transcription: Copying the DNA DNAgmRNA COMPARISON OF DNA AND MESSENGER RNA DNA mRNA Structure Double Helix Single Strand Sugar Deoxyribose C5 H10 O4 Ribose C5 H10 O5 Bases A,G,C,T A,G,C,U Uracil How can 4 bases tell you how to make proteins from 20 amino acids??? Law of Parsimony (The simplest answer is often the right answer. Sort of, not always but a lot.) 4 letter alphabet making 1–letter words? 4-letter alphabet making 2-letter words? A G AA GA CA TA AG GG CG TG AC GC CC TC AT GT CT TT C T mRNA & Codons The 3-base units of information on mRNA are called codons. AAU,GCC,CAU,GGG,CGA……………. Codons “spell out” the names of the specific amino acids to be used in making a specific PROTEIN. The sequence of bases on DNA or RNA is called, duh, the “base sequence” The Universal Genetic Code is 64 triplets It’s a 4-letter alphabet that makes 64 3-letter words Protein Synthesis (makin’ proteins) So this movie requires another actor… TRANSFER RNA (tRNA) Transfer RNA (tRNA) Protein Synthesis Some terms that you MUST know… DNA codes or triplets (the genetic code of DNA) TRANSCRIPTION (of DNA to make mRNA) mRNA CODONS (3-base information units of mRNA tRNA ANTICODONS (anticodons pair with codons) TRANSLATION (tRNA reads mRNA to make a protein) OK, so you want to make some protein… Hook together AMINO ACIDS with PEPTIDE BONDS Protein Synthesis = Translation (makin’ proteins) Codons Transfer RNA (tRNA) “Picks up and transfers the amino acids over to the ribosome and mRNA” tRNA Structure codon in mRNA anticodon in tRNA amino acid Fig. 14-7, p.223 Protein Synthesis (makin’ proteins) “Poly-ribosomes” Transcription Overview mRNA Mature mRNA transcripts Translation rRNA ribosomal subunits tRNA mature tRNA binding site for mRNA P (first binding site for tRNA) A (second binding site for tRNA) c Initiation ends when a large and small ribosomal subunit converge and bind together. elongation Amino Acid 1 d The initiator tRNA binds to the ribosome. e One of the rRNA molecules b Initiation, the first stage of translating mRNA, will start when an initiator tRNA binds to a small ribosomal subunit. initiation a A mature mRNA transcript leaves the nucleus through a pore in the nuclear envelope. Fig. 14-9a-e, p.224 f The first tRNA is released g A third tRNA binds with the next codon h Steps f and g are repeated termination i A STOP codon moves into the area where the chain is being built. j The new polypeptide chain is released from the ribosome. k The two ribosomal subunits now separate, also. Fig. 14-9f-k, p.224 and all this requires just 28 molecules… 20 5 2 1 THE END. TEST NEXT TIME. Extra slides below. Disregard the remaining slides… Hershey and Chase REPLICATION OF DNA