Microbiology: An Introduction
12th Edition
ISBN: 9780321929150
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: PEARSON
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Chapter 8, Problem 3MCQ
Feedback inhibition differs from repression because feedback inhibition
- a. is less precise.
- b. is slower acting.
- c. stops the action of preexisting enzymes.
- d. stops the synthesis of new enzymes.
- e. all of the above
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Chapter 8 Solutions
Microbiology: An Introduction
Ch. 8 - Briefly describe the components of DNA, and...Ch. 8 - DRAW IT Identify and mark each of the following on...Ch. 8 - Match the following examples of mutagens. Column A...Ch. 8 - The following is a code for a strand of DNA. a....Ch. 8 - Identify when (before transcription, after...Ch. 8 - Which sequence is the best target for damage by UV...Ch. 8 - You are provided with cultures with the following...Ch. 8 - Why are mutation and recombination important in...Ch. 8 - NAME IT Normally a commensal in the human...Ch. 8 - Match the following terms to the definitions in...
Ch. 8 - Match the following terms to the definitions in...Ch. 8 - Feedback inhibition differs from repression...Ch. 8 - Bacteria can acquire antibiotic resistance by all...Ch. 8 - Suppose you inoculate three flasks of minimal...Ch. 8 - Plasmids differ from transposons in that plasmids...Ch. 8 - Mechanism by which the presence of glucose...Ch. 8 - The mechanism by which lactose controls the lac...Ch. 8 - Two offspring cells are most likely to inherit...Ch. 8 - Which of the following is not a method of...Ch. 8 - Nucleoside analogs and ionizing radiation are used...Ch. 8 - Replication of the E. coli chromosome takes 40 to...Ch. 8 - Pseudomonas has a plasmid containing the mer...Ch. 8 - Ciprofloxacin, erythromycin, and acyclovir are...Ch. 8 - HIV, the virus that causes AIDS, was isolated from...Ch. 8 - Human herpesvirus-8 (HHV-8) is common in parts of...
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- State true or false, giving a brief justification: 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. Typically, an enhancer may cause the downregulation of transcription.arrow_forwardIn E. coli, induction in the lac operon and repression in the trp operon are both examples of a. negative control by a repressor. b. positive control by a repressor. c. negative control by an activator. d. positive control by a repressor.arrow_forwardYou are studying a new gene that is expressed within the adipose tissue of humans during the development of diabetes. Specifically, you want to learn why gene expression levels are very high in those people who develop diabetes. What DNA sequence would you concentrate on? Group of answer choices A specific response elements B the TATA box C enhancer sequences D promoter proximal elements E metal response elementsarrow_forward
- Which of the following statements concerning enhancer DNA sequences is true? Group of answer choices Enhancer DNA sequences must be located before (upstream) the genes they control. Enhancers DNA sequences are close to the genes they activate (via looping) even if they very far away as measured through the linear DNA sequence. Enhancer DNA sequences will not recruit their respective protein factors if you artificially insert the enhancer backwards. All these statements are true.arrow_forwardE. 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 promoterarrow_forwardAn operon is repressible—a small effector molecule turns off itstranscription. Which combination(s) of small effector molecule andregulatory protein could be involved in this process?A. An inducer plus a repressorB. A corepressor plus a repressorC. An inhibitor plus an activatorD. An inducer plus an activatorarrow_forward
- Binding of _______ to _______ in DNA can increase the rate of transcription of specific genes. a. activators; repressors c. repressors; operators b. activators; enhancers d. repressors; enhancersarrow_forwardIs 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.arrow_forwardPositive regulators are called: A. Repressors B. Activators C. Enhancers D. None of the abovearrow_forward
- A researcher has just identified a new protein in bacteria that binds DNA near the promoter of a gene and involved in the positive regulation of that gene. This new protein is most likely a(n). activator operator allosteric effector repressorarrow_forwardA mutation in the operator region of the trp operon can prevent the trp repressor from binding to this operator. When these mutant cells are placed in a solution containing chicken broth, which of the following happens? a. Tryptophan would bind to the repressor. b. The Repressor would bind to the operator irrespective of the presence of amino acids in the environment. c. The transcription of the trip operon would be inhibited. d. The transcription of the repressor protein is inhibitedarrow_forwardIf CAP is bound to the Promoter of the Lac Operon and the repressor protein is not bound to the operator, which of the following is true: a.Glucose Levels are low & Lactose is absent b.Glucose is absent & Lactose is present c.cAMP is low & Lactose is Absent d.Glucose and Lactose are Present e.cAMP is low & Lactose is presentarrow_forward
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