lec 13 - BIOLOGY 200 MIDTERM EXAM Monday Oct 25th 2010...

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BIOLOGY 200 MIDTERM EXAM Monday Oct 25th 2010 6:30-8pm ROOM ASSIGNMENTS First Letter of Last Name Building/Room A, B, C, D, E Leacock 132 F, G Stewart Biology N 2/2 H, I, J Stewart Biology S 1/3 K, L Stewart Biology S 1/4 M, N Leacock 26 O, P, Q Otto Maass 10 R, S, T Adams Auditorium U, V,W, X, Y, Z Otto Maass 112
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Quiz Friday….no class! The quiz will be open from: 9h Friday, October 15 th until 9h Monday, October 18 th If you need to see me about a problem with the material please email me and we will arrange an appointment.
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Key concepts A reading frame, the uninterrupted sequence of codons in mRNA from a specificd start codon to a stop codon, is translated into the linear sequence of amino acids in a polypeptide chain. Decoding the nucleotide sequence in mRNA into the amino acid sequence of proteins (translation) requires tRNAs and aminoacyl-tRNA synthetases. All tRNAs have a similar 3-D structure that includes an acceptor arm for attachment of a specific amino acid and a stem-loop with a 3-base anticodon at the opposite end.
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tRNAs fold into 4 base- paired stems and 3 loops. The amino acid is linked to the 3’ A in the acceptor stem.
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