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September 20 - Spacing between bases in B form DNA is 0.34...

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September 20, 2010 Spacing between bases in B form DNA is 0.34 nm or 3.4 Angstroms Translation Takes place on structures called ribosomes in the cytoplasm mRNA is read in units of three nucleotides (triplets) o Codons Each codon codes for a specific amino acid tRNAs are specific for an individual amino acid each amino acid has at least one, and usually more than one tRNA o anti-codon on each tRNA interacts with the mRNA with basepair interaction peptal transferase forms a peptide bond between the two amino acids mRNA read 5’ to 3’ direction each tRNA can exist in a charged form (with an attached amino acid) or an uncharged form (without an attached amino acid) The Three Roles of RNA Messenger RNA (mRNA) o Genetic information from DNA in the form of codons Transfer RNA (tRNA) o Key to decipher the codons in mRNA. Each tRNA has an associated amino acid and anticodon Ribosomal RNA (rRNA) o Associates with proteins to form ribosomes
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