pLEASE SOMEONE KIND HELP WITH ANSWERING THESE 10 MUTIPLE CHOICE QUESTION 44. In
ID: 68636 • Letter: P
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pLEASE SOMEONE KIND HELP WITH ANSWERING THESE 10 MUTIPLE CHOICE QUESTION
44. In the lac operon, a constitutive mutation in the operator is one that: a. cannot be bound by lacI b. cannot be bound by lacl in the presence of lactose c. is bound by a mutant lacI d. is bound by both lacI and lactose e. blocks the promoter, preventing transcription 45. Which of the following genetic arrangements is an operon? (P promoter, O operator) a. P genel gene2 gene3 b. PO genel c. P Ogenel gene2 d. P O genel P gene2 e. P genel P gene2 Pgene3 46. Three genes are in an operon. There is a frame-shift mutation in the reading frame of the first gene. How will this affect the reading frame of the other genes? a. the reading frame of the other two genes will also be shifted b. none of the genes will be transcribed c. none of the genes will be translated d. all of the above e. the other two genes will not be affected 47. Which of the following is cis-acting element? a. the lacI repressor protein b. RNA polymerase c. Shine-Dalagarno consensus sequence d. ribosomes e. tRNA 48. Diphtheria toxin produced by the pathogen Corynebacterium diphtheriae is: a. encoded by a phage b. expressed only under conditions of low free iron c. expressed only in the presence of high free iron d. a and b e. a and c 49. The reason eukaryotes do not use polycistronic mRNA is because: a. RNA polymerase will not transcribe through more than one gene b. they do not use operons c. they carry out post-transcriptional modification d. their ribosomes bind at the 5' cap e. the stop codon prevents more than one gene from being transcribed Page 10 of 20Explanation / Answer
44. The answer is cannot be bound by LacI
45. The answer is P O gene 1 gene 2
46. The answer is the reading frames of other two genes will also be shifted
47. The answer is Shine dalagarno sequence
48. The answer is both a and b i.e. encoded by a phage and expressed under the conditions of low free iron.
49. The answer is the stop codon prevents more than one gene from being transcribed.
41. The answer is Jacques monod
42. The answer I+P+OcZ+Y+A+
43. The answer is c
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