Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Chapter 18, Problem 5TYU
Summary Introduction
Introduction:
The lactose is the molecule that acts as an inhibitor of the repressor in the lac operon. The lac operon is active and acts efficiently when glucose is absent in the medium. It operates under the negative control, where inducer–repressor controls the activation of lac operon.
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Compare and contrast regulation by a repressor and an activator.
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- Sickle cell anemia is a disease caused by a mutation at the genotypic level. A person with two copies of the gene has the disease, but a person with one copy of the gene does not have the disease. The diagram shows how this mutation affects an organism. Use the image to answer the question. Which conclusion can you draw based on the diagram? A. The mutation changed the amino acid sequence during the translation step. B. A mutation caused the information in DNA to change during the transcription step. C. A change in the DNA sequence can be carried over to the translation and transcription steps. D. The change that affected the translation and transcription steps does not affect the organism.arrow_forwardGive typing answer with explanation and conclusion In eukaryotes, repressors can function by: Select one: binding to the regulatory promoter blocking DNA polymerase binding binding to the polyA tail blocking ribosome bindingarrow_forwardA. Which genes could be used to monitor the process of the disease? B.  If you worked for a drug company developing a treatment for the cancer, which genes would you target to turn on in cancer cells? C. Which genes would you target to turn off in cancer cells?arrow_forward
- In Eukaryotes, DNA is a long molecule inside a tiny nucleus. a. How can this long chain fit in such space? b. How does it affect gene expression?arrow_forwardWrite a brief essay that discusses why you think gene-regulatory systems evolved in bacteria, and why genes related to common functions are found together in operons.arrow_forwardYou are curious to identify the region of the gene X sequence that serves as an enhancer for gene expression. Design an experiment to investigate this issue.arrow_forward
- Why is regulating transcription the main way that cells control gene expression? A. Because transcription is the last step in gene expression, stopping here ensures that the cell has a stockpile of proteins to prepare them from all unexpected environmental changes. B. Because transcription involves interactions with DNA, preventing transcription reduces the changes of mutation in the cell’s genome. C. Because transcription is the first step in gene expression, stopping at transcription reduces the amount of energy and resources used by producing unnecessary gene products. D. Because transcription is the shortest step in gene expression, preventing transcription has little effect on the rate of protein production.arrow_forwardPlease choose the correct answer. The prokaryotic operator gene is turned on if a. a repressor binds with an aporepressor. b. an inducer binds with the operator gene. c. a repressor binds with a regulatory protein. d. an inducer binds with the regulatory protein.arrow_forwardCan 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 happensarrow_forward
- In the trp operon, what happens to the trp repressor in the absence of tryptophan? a. It binds to the operator and represses transcription. b. It cannot bind to the operator, and transcription takes place. c. It binds to the regulator gene and represses transcription. d. It cannot bind to the regulator gene, and transcription takes place.arrow_forwardWhat 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 transcriptionarrow_forwardUse the lac operon as an example to describe one way thatbacteria regulate gene expressionarrow_forward
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