Ch Protein Synthesis Protein Synthesis Proteins are polypeptides

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Presentation transcript:

Ch. 12.3 Protein Synthesis Protein Synthesis Proteins are polypeptides Long chain of amino acids

Ch. 12.3 Protein Synthesis There are 20 amino acids DNA codes For the order of amino acids

Ch. 12.3 Protein Synthesis Amino acids are connected by peptide bonds Ribosomes connect amino acids together in a chain and make the peptide bonds between them.

Ch. 12.3 Protein Synthesis Genetic Code (universal) DNA Codes for Amino Acids 3 mRNA nucleotides code for an amino acid. This is called a codon. Each codon is specific for an Amino Acid The Start Codon is AUG. This starts translation. The Stop Codons UAG UAA UGA

Ch. 12.3 Protein Synthesis Translation: RNA to Protein A process where the mRNA is converted to Amino Acids and proteins are synthesized. Occurs in ribosomes

Ch. 12.3 Protein Synthesis Protein Assembly 1. start codon attaches to the ribosome 2. tRNA carries an anti codon and appropriate Amino Acid 3. Ribosome moves to the 2nd codon 4. creates peptide bond between the amino acids 5. the ribosome falls off the mRNA

Ch. 12.3 Protein Synthesis

Ch. 12.3 Protein Synthesis mRNA – portable genetic code (message) that leaves the nucleus and is read by ribosomes (made by Transcription) tRNA – transferss in amino acids rRNA – makes up part of ribosome