Class Date Indicate the answer choice that best completes the statement or answe
ID: 99980 • Letter: C
Question
Class Date Indicate the answer choice that best completes the statement or answers the question -1. A transcription factor is a. a subunit of RNA polymerase II that does not have a prokaryotic analogue. b. the part of the promoter sequence closest to the start of transcription. c. a protein other than RNA polymerase that is involved in transcription. d. a sequence that determines whether an upstream element will be an enhancer or silencer 2-The major diference between RNA initiation in eukaryotes and prokaryotes is the number of factors involved in the process. a. True b. False -3. Where is the TATA box located? a. At the transcription start site (+1) b.-10 region. c. -25 region. d.-40 region. -4. Which of the following is not a key step in the activation of mRNA synthesis in eukaryotes? a. Binding of TBP to the DNA. b. Binding of other transcription factors. c. Binding of RNA Pol I. d. Phosphorylation of the RNA Pol. e. All of these are necessary to initiate RNA synthesis in eukaryotes. -5. Which of the following RNAs is noted for having a "cloverleaf" structure? a. mRNA b. rRNA c. tRNA d. All of these 6. A commonly encountered feature of transfer RNA synthesis is a. the precursor of several tRNA molecules is transcribed in one long polynucleotide sequence b. there is little or no base modification after transcription c. modification of the sugar moiety never takes place d. the covalent binding of tRNA to specific proteinsExplanation / Answer
[I am going to answer 1-3 question. I hope it helps. Thanks]
1. A transcription factor is a protein that controls the rate of transcription. Transcription is the transfer of genetic information from DNA to messenger RNA. Option C is the correct answer.
2. This statement is true as in prokaryotes, the initiation of transcription does not require any protein while the eukaryotes require a number of protiens like TFIIA, TFIIB, TFIID, TFIIE, TFIIH, etc.
3. TATA box is a type of promoter sequence which promotes the transcription process. Many eukaryotic genes have a conserved TATA box located 25-35 base pairs before the transcription start site of a gene. Option C is the correct answer.