Question # 1. Polycistronic mRNA refers to A. mRNA which is transcribed by multiple RNA polymerases B. mRNAs that are simultaneously translated C. mRNA that is translated by many ribosomes simultaneously D. mRNA with multiple open reading frames Question # 2. Many genes involved in pathogenicity are located in defined continuous regions (“islands”) of the genome and have different GC content from other portions of the genome, suggesting that they have arisen through A. horizontal gene transfer B. gene duplication and subsequent mutation C. protection from methylation D. increase in the rate of mutation of successive GC pairs Question # 3. A linear arrangement of three DNA nucleotides called a triplet contains four possible bases (A, C, G and T). How many different triplets are possible without ‘AT’ as first two letters? A. 32 B. 48 C. 60
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