Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 18, Problem 4TYK
Summary Introduction
Introduction:
A regulon can be defined as a group of genes that are regulated as a unit, controlled by the genes, which are involved in the expression of the protein acting as a repressor or as an activator.
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Is each of the following statements true or false?
A. An enhancer is a type of regulatory element.
B. A core promoter is a type of regulatory element.
C. Regulatory transcription factors bind to regulatory elements.
D. An enhancer may cause the down regulation of transcription.
Eukaryotic cells have multiple complex mechanisms for the regulation of gene expression, but a regulatory mechanism they rarely (if ever) use is
a. operons.
b. regulatory proteins.
c. transcriptional factors.
d. promoters.
E. coli are grown on a medium containing lactose. Once glucose is added to the medium, the bacteria stop fermenting lactose. Which of the following BEST explains the observed effect?
A. Cellular levels of cAMP are lowB.Glucose is bound to the promoter
C. Repressor protein is bound to the operator
D. Repressor protein is bound to the promoter
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- All genes regulated by PKA contain a cis-acting DNA sequence that binds to the phosphorylated form of a transcription factor called (choose one answer) a. CREB. b. C-Jun. c. beta-catenin. d. TCF.arrow_forwardIn humans, bone cells and nerve cells have very different functions and produce different sets of proteins. The reason for the observed differences in the proteins expressed by these different cell types within the same individual is that bone and nerve cells contain different A. DNA sequences. B. promoters and operators. C. combinations of regulatory proteins. D. operons.arrow_forwardA scientist compares the promoter regions of two genes. Gene A’s core promoter plus proximal promoter elements encompasses 70bp. Gene B’s core promoter plus proximal promoter elements encompasses 250bp. Which of the scientist’s hypotheses is most likely to be correct? a. More transcripts will be made from Gene B. b. Transcription of Gene A involves fewer transcription factors. c. Enhancers control Gene B’s transcription. d. Transcription of Gene A is more controlled than transcription of Gene B.arrow_forward
- Which of the following statements about gene regulation is false? a. An operon contains DNA sequences that regulates its own expression. b. The operator region can only be bound by an activator protein. c. Transcription factors can affect the binding of RNA polymerase to the promoter. d. A repressor is a transcription factor that hinders gene transcription.arrow_forwardthere is the statement: "Both stem cells and specialized cells have all the same genes. They differ in the regulation of those genes and express very different sets of genes ". Which one of the following explanations best accounts for this difference in stem cell and specialized cell gene expression? A. Stem cells and specialized cells have different activators and repressors that affect transcription B. Stem cells and specialized cells have different promoter sequences for their genes, thus affecting transcription C. Stem cells and specialized cells have different ribosomes that affect translation D. Stem cells and specialized cells use different start codons on mRNAs, thus affecting translationarrow_forwardWhich of the following is true of CpG islands? a. They are methylated near promoters of actively transcribed genes. b. They are unmethylated near promoters of actively transcribed genes. c. Acetylation of CpG islands leads to repression of transcription. d. CpG islands code for RNA molecules that activate transcription.arrow_forward
- Which of the following is generally true about eukaryotic gene regulatory regions? a. All regulatory regions lie within 200 base pairs of the promoter. b. Promoters are typically under control of a single regulatory sequence. c. Promoters are usually blocked through the action of repressors d. Enhancer sequences can be located thousands of base pairs upstream or downstream from the promoter.arrow_forwardHow does reverse methylation affect gene expression? Select one: o a. The gene is turned off, but still expresses a protein product. b. The gene becomes transcriptionally silent. c. There is no effect on the gene. d. The gene is hyperactive resulting in a gain of function. e. The gene expresses the wrong protein. Clear my choice How do microRNAs regulate epigenetic mechanisms during development? Select one: o a. MicroRNAs function as gene repressors b. You only find microRNAS in epigenetic and cancer cells c. MicroRNAs function as gene activators d. MicroRNAS regulate methylation on the DNA sequences of embryos e. Researchers find that when microRNAs are present the effects of epigenetic modifications are 50% greater Clear my choicearrow_forwardWhich of the following DNA regions is NOT involved on gene expression regulation in Eukaryotes?. ( not enhancer or promotor-proximal) A. Promoter-proximal B. Promoter C. Enhancer D. Operatorarrow_forward
- Which of the following best explains how the prokaryotic expression of a metabolic protein can be regulated when the protein is already present at a high concentration? a.Repressor proteins can be activated and bind to regulatory sequences to block transcription. b.Regulatory proteins can be inactivated to increase gene expression. c.Transcription factors can bind to regulatory sequences to increase RNA polymerase binding. d.Histone modification can prevent transcription of the gene.arrow_forwardWhich of the following is not an example of constitutively expressed gene? a. genes for cell division and growth b. genes involved in DNA repair c. genes for cellular respiration d. genes that function in ATP synthesisarrow_forwardGeneral transcription factors Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a a) act at every gene for a given RNA pol b b) act only at specific genes for under specific conditions c) must be very close to the promoter C d) none of the abovearrow_forward
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