1) In the trp operon, starvation to multiple amino acids other than tryptophan w
ID: 133957 • Letter: 1
Question
1) In the trp operon, starvation to multiple amino acids other than tryptophan would cause: a) region 1 pairing with region 2, 3 with 4 and termination of transcription b) region 1 pairing with region 2, 3 with 4 and non-termination of transcription c) region 2 pairing with region 3, region 4 unpaired and termination of transcription d) region 2 pairing with region 3, region 4 unpaired and non-termination of transcription e) none of the above, the trp operon only responds to tryptophan availability 2) Before transcription of the lac operon can occur, RNA polymerase must bind strongly to the promoter. This happens when a) CAP binds to the CAP site in the promoter b) CAP-cAMP complex binds to the CAP site in the promoter c) catabolite repression occurs d) lac is mutated to lacl e) b and c f) none of the aboveExplanation / Answer
1. Region 1 is paired with region 2 and 3 is paired with 4 in presence of tryptophan and causes premature inhibition of transcript by attemuation. Option a is correct.
2. If lac I+ is mutated to lac I- then inhibitor is absent and transcription will atarted. Option d is correct.
3. It will complimentry bind to AUA. Option d is correct.
4. Total length of mature mRNA will be about 375 nucleotide long. 175 nucleotide long exons and 200 nucleoside Poly A tail. Option d is correct.
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