Which of the following will increase the rate of transcription? a. Activation of a transcriptional repressor b. Inhibition of a transcriptional activator c. Histone methylation leading to chromatin compaction d. Removal of RNA polymerase
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- Which of the following is true of transcription factors? A)The same transcription factors are found in all cell types. B)They can increase or decrease gene expression. C)They are a type of cis-acting element. D)They bind only to promoters.Can one transcription factor sometimes act as a repressor and sometimes act as an activator? a. Yes, but it depends on where the transcription factor binds in the promoter b. Yes, but it depends on other proteins that might act with the transcription factor c. No, transcription factors are always either activators or repressors d. Yes, but only if a mutation happensWhat is a possible outcome of the addition of a transcription factor such as Myod to the nucleus of a cell? Assume that there are no other factors to either activate or prevent the response of the cell. Group of answer choices A) Production of mRNA from genes that were previously not expresed B)adding methyl groups to DNA C)prevention of protein synthesis D)uncoiling of the chromatin to allow transcription
- Transcriptional activation of eukaryotic genes involves which of the following events? a. Changes in nucleosome locations b. Changes in histone composition within nucleosomes c. Changes in histone modifications d. All of the aboveChromatin remodeling is affected by two processes, DNA methylation and a. base substitution b. histone covalent modifications c. ultraviolet radiation d. transcription factor bindingWhich of the following is the best description of a transcription factor? A. A protein that brings the correct nucleotides to RNA polymerase B. A protein that binds to specific DNA sequences C. A DNA sequence that binds to RNA polymerase D. A modification that is made to mRNA to help it be exported from the nucleus. .
- Answer the following concisely: a. Where does transcription begin? b. What are the template and coding strands of DNA? c. Why only one strand transcribed? d. Is the same strand of DNA always transcribed?Post-translational control refers to: a. regulation of gene expression after transcription b. regulation of gene expression after translation c. control of epigenetic activation d. period between transcription and translationPost-translational modifications of proteins can affect which of the following? a. protein function b. transcriptional regulation c. chromatin modification d. all of the above
- Mutations that occur at the end of a gene may alter the sequence of the gene and prevent transcriptional termination. A. What types of mutations would prevent ρ-independent termination? B. What types of mutations would prevent ρ-dependent termination? C. If a mutation prevented transcriptional termination at the end of a gene, where would gene transcription end? Or would it end?Most transcriptional activator proteins affect transcription by interacting with a. introns. b. the basal transcription apparatus. c. DNA polymerase. d. the terminator.Proteins that regulate gene expression by directly binding to the DNA are known as _____. a. transcription factors b. transposable elements c. translation factors d. phosphorylation e. methylation