Microbiology: An Introduction
11th Edition
ISBN: 9780321733603
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: Benjamin Cummings
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Textbook Question
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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Explain very well please ASAP.
Enhancers:
a.
are always located upstream of the TATA sequence
b.
are always within 200 bp of the TATA sequence
c.
are responsible for time and tissue specific transcription
d.
All the above are true.
In 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.
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 - Prob. 5RCh. 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 - 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 - 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 - 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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- Enzymes that have binding sites for modulators are specifically called a. zymogens b. quaternary proteins c. induced enzymes d. allosteric enzymesarrow_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_forwardBinding 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_forward
- 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.arrow_forwardA mutation occurs in the lac operon operator site such that LacI can no longer bind to the operator site. The effect that this mutation has on the cell is that a. the activity of the lac operon will not be affected. b. the cell can no longer convert lactose to glucose. c. the expression of the lac genes cannot be turned off. d. the expression of the lac genes cannot be turned on.arrow_forwardPositive regulators are called: A. Repressors B. Activators C. Enhancers D. None of the abovearrow_forward
- A 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_forwardSelect one: and p53 is a a transcription factor, motor protein b. kinase, motor protein c. transcription factor, kinase d. motor protein, transcription factor e. motor protein, protease f. kinase, transcription factorarrow_forwardIn a suppressor interaction, produce(s) a protein complex that is O a. 1 mutation, active b. 1 mutation, inactive С. 2 mutations, active d. 2 mutations, inactivearrow_forward
- In terms of gene expression, the regulation of lac operon is an example of? A. Post-transcriptional regulation B. Alternative splicing C. Splicing D. Transcriptional regulation E. Post-translational regulationarrow_forwardThe Trp peron of genes encoding enzymes for Trp synthesis, is which of the following? Select one: a.inducible b.activated c.constitutive d.repressible e.None of the Abovearrow_forwardControl of the trp operon relies on which of the following: a. High levels of tryptophan causing a pause (but not termination) in transcription b. Low levels of tryptophan causing a pause (but not termination) in transcription c. Allolactose binding to the inhibitor to prevent it from binding to the promoter d. Tryptophan binding to the inhibitor to prevent it from binding to the promoterarrow_forward
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