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TFIID
TFIIA
TFIIH
TBP
TFIIB
TFIIF
TFIIE
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Solved in 2 steps
- Identify the labeled factors in the figure below (A and B) and indicate the direction of transcription. ts A O A= Mediator, B= TFIID; direction is into the screen O A= TEIIE, B= TFIIH; direction is into the screen rences A= TBP, B= TEIIB; direction is out of the screen O A= TFIIF, B= TFIIE; direction is out of the screenA pre-initation complex (PIC) is required for transcription to begin. State which TFII protein has catalytic function.Regarding the trp operon: when levels of tryptophan are low, the ___ hairpin forms, resulting in _____ of transcription. Group of answer choices 2-3; termination 3-4; termination 3-4; continuation 2-3; continuation
- Once an RNA polymerase has initiated transcription, it will release the sigma factor or sigma subunit and bind other proteins known as elongation factors before it begins moving down the DNA template doing strand elongation. Briefly explain why this is necessary - why can't RNA polymerase + sigma factor do all of transcription? Be specific.Here is the sequence of a portion of a bacterial gene. The template strand is on the bottom: 5’-ATGCTGCGTGCATGGGATATAGGTAGCACACGTCC-3’ 3’-TACGACGCACGTACCC TATATCC ATCGTGTGCAGG-5’ Assuming that transcription starts with the first C in the template strand, and continues to the end, what would be the sequence of the mRNA derived from this fragment? Q) Would there be an effect on translation of changing the fourthA in the template strand to a C? If so, what effect?This diagram shows a double-stranded section of DNA. The arrow indicates location and strand of the transcription start site. The direction of transcription is also indicated. In which box would you find a 5’TATAA \3’ promoter sequence that would be used for initiating transcription at the start site shown? a) Box A b) Box B c) Box C d) Box D
- Write out the sequences of the two conserved elements in the following bacterial promoter. The startpoint of transcription is shown in red. TGCTTGACTCTGTAGCGGGAAGGCGTATTATGCACACCGCG(c) By binding one L-tryptophan molecule/monomer, the trp repressor binds to DNA to suppress syn- thesis of L-tryptophan in E. coli. Below is the amino acid sequence of the helix – (reverse) turn – helix region of the trp repressor that binds to DNA compared to the sequence of the corresponding DNA binding motif of the Prl protein, a different type of repressor protein. A diagram of the trp repressor dimer is also shown. reverse turn trp helix 4 70 Trp -Gly-Glu-Met-Ser-Gln-Arg-Glu-Leu-Lys-Asn-Glu-Leu-Gly-Ala-Gly- Ile- Prl -Ser-Glu-Glu-Ala-Lys-Glu-Glu-Leu-Ala-Lys-Lys-Cys-Gly-Ile-Thr- Val- Pri heilix trp helix 5 80 90 Trp Ala-Thr-Ile-Thr-Arg-Gly-Ser sgn-Ser-Leu-Lys-Ala-Ala- Prl Ser-Gln-Val-Ser-Asn-Trp-Phe-Gly-Asn-Lys-Arg-Ile-Arg- Prl helixThe following diagram represents DNA that is part of the RNA-coding sequence of a transcription unit. The bottom strand is the template strand. Give the sequence found on the RNA molecule transcribed from this DNA and identify the 5′ and 3′ ends of the RNA. 5′–ATAGGCGATGCCA–3′ 3′–TATCCGCTACGGT–5′ ← Template strand
- The following is a sequence of the leader region ofthe his operon mRNA in Salmonella typhimurium.What bases in this sequence could cause a ribosometo pause when histidine is limiting (that is, when thereis very little of it) in the medium?5′ AUGACACGCGUUCAAUUUAAACACCACCAUCAUCACCAUCAUCCUGACUAGUCUUUCAGGC 3′Once an RNA polymerase has initiated transcription, it will release the sigma factor or sigma subunits or bind other proteins known as elongation factors before it begin moving down the DNA template doing strand elongation. Briefly explain why this is necessary - why cant RNA polymerase + sigma factor do all of transcription?Using the following list of codons describe, using diagrams etc., how information stored in the DNA is translated into a peptide. Be sure to discuss all steps. In other words, use a diagram and give me sequences, transcription and translation steps. Show the sequences of the sense and the other DNA strand, the mRNA and the tRNA’s. UUU -phenylalanine UCU -serine AUG –initiation/methionine CUU -leucine ACU -threonine GUU -valine UAA -Termination