Chapter 12-3: RNA & Protein Synthesis Essential Questions:  What are 3 types of RNA?  What is the function of 3 types of RNA?  What happens during transcription?

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Presentation transcript:

Chapter 12-3: RNA & Protein Synthesis Essential Questions:  What are 3 types of RNA?  What is the function of 3 types of RNA?  What happens during transcription?  What happens during translation?

How does a gene work?  Structure of RNA  Ribose, not deoxyribose  Uracil replaces thymine  Single, not double strand

 Types of RNA  mRNA: messenger RNA  rRNA: ribosomal RNA  tRNA: transfer RNA  Transcription  Enzymes separate DNA strand, uses 1 strand to make mRNA strand

 The Genetic Code  Proteins = polypeptides = long chains of amino acids  Properties of proteins determined by sequence of amino acids  Codon = 3 base sequence that specifies a single amino acid  Ex: UGUGGAACGCAU specifies what sequence of amino acids?  4 x 4 x 4 = 64 possible combinations, so some a. acids have more than codon

 Translation  Happens at ribosome  mRNA are “instructions” – ribosome “reads” instr. to build proteins  Translation starts when mRNA attaches to ribosome & moves through it  tRNA “anti-codon” for each a. acid brings it to ribosome  Polypeptide chain grows until a “stop” codon is reached, ribosome then releases polypeptide chain (now a protein)

 Roles of DNA & RNA  Master plans vs. disposable instructions  Genes & proteins  Why are proteins key?  Because proteins control reactions that are key to almost everything living cells do