Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 14, Problem 6TY
Summary Introduction
Introduction: The CAP (Catabolite activation protein). is the protein which is activated by cyclic adenosine monophosphate. These proteins stimulate the synthesis of enzymes that catabolize non-glucose metabolites.
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As trytophan levels increase in the cell, _____ bind(s) to active aporepressors, causing ______ of tryptophan operon.
a.
inducers, negative regulation
b.
repressors, co-repressing
c.
tryptophan, negative regulation
d.
tryptophan, positive regulation
e.
B-lactose, negative regulation
If lactose and glucose are provided in the growth medium of a culture of E. coli, then
a. Both lactose and glucose are metabolized at same rate.
b. Lactose metabolism is favored.
c. CAMP-CAP complex binds CAP site.
d. Lac Operon is repressed.
e. Adenylate cyclase is activated.
Which of the following environmental conditions would be MOST likely to result in transcription of the lac operon in an E. colicell?
A. low levels of lactose and high levels of glucose
B. high levels of lactose and high levels of cyclic AMP
C. low levels of lactose and low levels of cyclic AMP
D. high levels of lactose and high levels of glucose
Chapter 14 Solutions
Biology
Ch. 14.1 - Prob. 1CCCh. 14.2 - Which genes are under the control of the lac...Ch. 14.2 - With regard to regulatory proteins and small...Ch. 14.2 - What were the key observations made by Jacob,...Ch. 14.2 - CoreSKILL What was the eventual hypothesis...Ch. 14.2 - Prob. 3EQCh. 14.2 - Core Skill: Connections Look back at Fig 9.12....Ch. 14.2 - What are the advantages of having both an...Ch. 14.2 - Prob. 2CSCh. 14.3 - Prob. 1CC
Ch. 14.4 - What are the two opposing effects that histone...Ch. 14.4 - Prob. 1CSCh. 14.5 - Prob. 1CCCh. 14.5 - Prob. 2CCCh. 14 - Prob. 1TYCh. 14 - Prob. 2TYCh. 14 - Transcription factors that bind to DNA and...Ch. 14 - Prob. 4TYCh. 14 - For the lac operon, what would be the expected...Ch. 14 - Prob. 6TYCh. 14 - The trp operon is considered _____ blank operon...Ch. 14 - Prob. 8TYCh. 14 - Prob. 9TYCh. 14 - _____ blank refers to the process that allows a...Ch. 14 - Prob. 1CQCh. 14 - Transcriptional regulation often involves a...Ch. 14 - Prob. 3CQCh. 14 - Discuss the advantages and disadvantages of...Ch. 14 - Discuss the advantages and disadvantages of...
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- b. c. spores d. all of the above e. none of the above 4. Concerning the lac operon, activation of the protein called CAP by CAMP will enable the complex CAP-CAMP to bind to the a. promoter b. terminator c. activator-binding site d. operator e. coding sequence 5. Bacteria are excellent model organisms for genetic studies, and mutations often result in observable phenotypic changes because a. of their rapid growth b. they are haploid organisms c. they can be studied in relatively inexpensive experiments d. they have a diploid genome e. their phenotypic changes can also be affected by environmental factorsarrow_forwardIn prokaryotes, the trp operon is under ________ that ________ prevents RNA polymerase from binding. a. negative regulation; biochemically b. negative regulation; physically c. positive regulation; biochemicallyarrow_forwardWhich of the following molecules is an inducer of the lac operon:a. Galactose d. Isothiocyanateb. Glucose e. cAMPc. Allolactose f. Lactosearrow_forward
- Which of the following statements about the lac operon is correct? 1. lacZ, lacY and lacA proteins are translated using the same RNA molecule. 2. Lacl is a gene that codes for allolactose. 3. Allolactose activates transcription of lacz, lacY and lacA. 4. In the presence of lactose, the repressor is active. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3, and 4 are correct.arrow_forwardThe tryptophan operon is a repressible operon that is A. transcribed only when glucose is present in the growth medium B. not transcribed whenever tryptophan is plentiful in the growth medium C. permanently turned on D. turned on only when tryptophan is present in the growth mediumarrow_forwardThe presence of _____ in the medium prevents CAP from binding to theDNA, resulting in _____ in transcription of the lac operon.a. lactose, an increase d. glucose, a decreaseb. glucose, an increase e. lactose, a decreasec. cAMP, a decreasearrow_forward
- in E.coli, high glucose levels reduce cyclic AMP (cAMP) levels which then ______ transcription of the lactose operon. a. does NOT change b. decreases c. increasesarrow_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_forwardCatabolite activating factor (CAP) senses and the transcription of the lac operon. A. glucose; represses B. lactose; represses C. none of the above D. cAMP; activatesarrow_forward
- When lactose is present in the environment, the lac operon is transcription occurs to produce enzymes that catalyzes the sugar Select one: a. False b. Truearrow_forwardA newly synthesized drug is able to inhibit growth of pathogens by inhibiting a genetic process of the prokaryote without affecting those of the host cells. Which of the following is most likely NOT a possible mechanism of action of this drug? A. Inhibition of the formylation of methionyl-t-RNA B. Binding of the 50S with the 30S subunit C. Binding of RNA polymerase the promoter region of a gene D. Binding of MRNA to the 30S subunit of the ribosomes E. Binding of the drug to the 70S ribosome, preventing translocation of tRNAs.arrow_forwardA mutation that inactivates the repressor gene of the lac operon results in (a) the continuous transcription of the structural genes (b) no transcription of the structural genes (c) the binding of the repressor to the operator (d) no production of RNA polymerase (e) no difference in the rate of transcriptionarrow_forward
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