Molecular Biology Module 4: Translation
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The alanine aminoacyl tRNA synthetase enzyme of E. coli recognizes the alanine tRNA only by an unusual G:U base pair at position 70 in the stem of the tRNA. In the laboratory, you make a copy of the alanine tRNA gene that is identical to the wildtype copy except that the anicodon sequence 5' - IGC -3' is replaced with the sequence 5' - UCA -3'. You then add this mutant tRNA gene back into a wildtype E. coli. As a result,
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Complete the following sentence. The covalent bond between a tRNA and its amino acid is catalysed:
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You have found an E. coli that is mutant at the gene encoding EF-Tu. The only effect of the mutation is to decrease the rate of hydrolysis of EF-Tu-GTP. The effect of this mutation will most likely be:
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In humans there are 64 codons. 61 of these code for amino acids. There are 20 amino acids. There are 31 tRNAs. How many different aminoacyl tRNA synthetases are there?
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Look at the genetic code included with the exam. What is the minimum possible number of different tRNAs to be charged with Serine?
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Which of the following are correct? Because of the differences in the translation machinery between Prokaryotes and Eukaryotes:
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Under conditions where methionine must be the first amino acid, what protein would be coded for by the following mRNA? 5'-CCUCAUAUGCGCCAUUAUAAGUGACACACA-3'
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This is an important step in translation. It is mediated by:
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