1. The switch of an operon is turned on if specific substance is not bound to the operator. This substance is called :   a repressor   a promoter   an operon   an activator   Hint Half-n-half Clue   2. A series of 20 to 200 Adenine ribonucleotides that is added to the 3' end of the transcribed RNA molecule (pre-mRNA) that helps in the transportation of mRNA out of the nucleus is called :   cap   trailer   the poly-A-tail   a Shine-Dalgarno sequence   Half-n-half Clue   3. A gene that encodes RNA that functions without being translated into a protein is called :   An RNA gene   AN Oncogene   A quiet gene   A pseudogene   Half-n-half Clue   4. Proteins that bind between the promotor region and the section of the gene which is transcribed thus blocking transcription (preventing gene expression) are called :   Activators   Operator   Repressors   inducer   Half-n-half Clue   5. A G-C-rich stretch of nucleotides, followed by an A-T-rich stretch of nucleotides is the signal for :   Rho dependent termination   Initiation   Rho independent termination   transcription   Half-n-half Clue   6. The sequence of bases located prior to the gene (along the DNA strand), to which a complex of RNA polymerase and sigma factors attaches itself to initiate transcription is called :   promotor   terminator   exon   telomere   Half-n-half Clue   7. The series of three consecutive mRNA bases coding for one specific amino acid in a protein is called a :   intron   codon   transposon   exon   Half-n-half Clue