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Zoology - Lecture 8 - How does DNA work Codes for genes...

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1 How does DNA work? Codes for genes that are inherited from your parents – Sequence of DNA that specifies the creation of an mRNA strand – These mRNA strands code for the creation of polypeptides/proteins – Proteins are what allows cells to grow, function, communicate, etc. Recall… DNA: Double stranded A – T and G – C The cookbook for creating RNA and proteins RNA: Single stranded A – U and G – C The “chef” of RNA and protein production Three types RNA mRNA: carries message of DNA 500-3000 nucleotides rRNA: forms ribosomes 100-3000 nucleotides tRNA: transfers amino acid 75-80 nucleotides Protein synthesis DNA codes for proteins 1. Transcription = transfer of info from DNA to mRNA (in nucleus) 2. Translation = transfer of info from mRNA into a polypeptide (in cytoplasm -- ribosomes) Cytoplasm Nucleus 13.01 DNA to RNA to Protein Transcription DNA RNA Protein Translation
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2 G RNA 13.06 The Relationship Among RNA, the DNA Template Strand, and the DNA Coding Strand G 5’ DNA coding strand DNA template strand 5’ 3’ 5’ 3’ DNA G T C A T T C G G C A G T A A G C C G RNA 13.06 The Relationship Among RNA, the DNA Template Strand and the DNA Coding Strand C G 5’ DNA coding strand DNA template strand 5’ 3’
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