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Unformatted text preview: CSC209 ASSIGNMENT 2 Due at 7:00p.m. on June 24 th QUESTION 1 15 POINTS The information stored in deoxyribonucleic acid (DNA) can be thought of as a string consisting of the characters A, T, C, G. This genetic code is translated by the molecular machinery of the cell into a sequence of amino acids according to the following table: T C A G T TTT (Phe/F), TTC (Phe/F) TCT (Ser/S), TCC (Ser/S) TAT (Tyr/Y), TAC (Tyr/Y) TGT (Cys/C), TGC (Cys/C) TTA(LeT/L), TTG(LeT/L) TCA (Ser/S), TCG (Ser/S) TAA (STOP), TAG (STOP) TGA (STOP), TGG (Trp/W) C CTT (LeT/L), CTC (LeT/L) CCT (Pro/P), CCC (Pro/P) CAT (His/H), CAC (His/H) CGT (Arg/R), CGC (Arg/R CTA (LeT/L), CTG (LeT/L) CCA (Pro/P), CCG (Pro/P) CAA (Gln/Q), CAG (Gln/Q) CGA (Arg/R), CGG (Arg/R) A ATT (Ile/I), ATC (Ile/I) ACT (Thr/T), ACC (Thr/T) AAT (Asn/N), AAC (Asn/N) AGT (Ser/S), AGC (Ser/S) ATA (Ile/I),ATG (Met/M) ACA (Thr/T), ACG (Thr/T) AAA (Lys/K), AAG (Lys/K) AGA (Arg/R), AGG (Arg/R) G GTT (Val/V), GTC (Val/V GCT (Ala/A), GCC (Ala/A) GAT (Asp/D), GAC (Asp/D) GGT (Gly/G), GGC (Gly/G) GTA (Val/V) , GTG (Val/V) GCA (Ala/A),GCG (Ala/A) GAA (GlT/E), GAG (GlT/E) GGA (Gly/G), GGG (Gly/G) You can see from the above table that each group of 3 characters (called codons) from the DNA sequence corresponds to an amino acid. For example, the codon GTT codes for the amino acid Valine, which is represented by the single-letter V. There are 3 special codons: TAA, TAG, TGA. These are called stop codons and they do not code for any amino acid. One thing we didnt talk about in assignment 1 is that DNA is double stranded . Each character in the DNA sequence has another character paired with it: A always pairs with T, and C always pairs with G. For example the DNA sequencehas another character paired with it: A always pairs with T, and C always pairs with G....
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