Journal 5-6: A Closer Look at Protein Synthesis And Review of Journal 5-5.

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Journal 5-6: A Closer Look at Protein Synthesis And Review of Journal 5-5

2 Genes and Traits Genes – section of DNA that codes for a protein ~21,000 proteins (only!) Genotype - Letters in your DNA Ex. Gene mutation that causes sickle cell Phenotype - physical trait or characteristics Ex: Symptoms of Sickle Cell Central Dogma of Biology: DNA RNA Protein genotypephenotype

Written Language is a code! ABCDEFGHIJKLMNOPQRSTUVWXYZ 26 characters Specific sequences are required to communicate. RACECAR has meaning but….. RRAACCE does not DNA has a 4 base code…. ATCG Specific sequences are required to produce specific proteins 3

Gene Expression = Protein Synthesis 2 Steps Transcription DNA sequence converted to mRNA sequence Translation mRNA sequence converted to amino acid sequence

Protein Synthesis: Cellular components Transcription RNA polymerase – Enzyme that converts DNA sequence to mRNA sequence Process occurs in nucleus

Protein Synthesis: Cellular Components Translation Ribosome (rRNA) – Cell structure that converts mRNA sequence into amino acid sequence, makes the polypeptide (protein) Transfer RNA (tRNA) – carries amino acids into the correct position Codon to anticodon pairing

7 Genetic Code Codons and corresponding Amino Acids Redundant code

8 thesunwashotbuttheoldmandidnotgethishat the sun was hot but the ole man did not get his hat the sun was hot but the old man did not get his cat the sun was hot but the old ma. did not get his hat thd esu nwa sho tbu tth eol dma ndi dno tge thi sha t