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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Which of the following is true of operons?a. They consist of a coordinated set of genes, all of which are regulated as a single unit.b. They may be inducible or repressible.c. Only bacteria and archaea utilize operons.d. All of the above are true.
A 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.
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.
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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- A 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_forwardWhich protein(s) would be bound to the DNA of the lac operon in the presence of both lactose and glucose? A.) both lac repressor protein AND CRP-cAMP B.)neither the lac repressor protein NOR CRP-cAMP C.)the lac repressor protein D.)CRP-cAMParrow_forwardWhat would occur if the repressor of an inducible operon weremutated so it could not bind the operator?(A) irreversible binding of the repressor to the promoter(B) reduced transcription of the operon’s genes(C) buildup of a substrate for the pathway controlled by theoperon(D) continuous transcription of the operon’s genesarrow_forward
- The presence of glucose in the medium will lead to: a) increased cAMP concentrations and reduction of lac operon gene expression b) increased cAMP concentrations and promotion of lac operon gene expression c) reduced cAMP concentrations and reduction of lac operon gene expression d) reduced cAMP concentrations and promotion of lac operon gene expressionarrow_forwardThe gad operon is controlled by a number of transcription factors that regulate a promoter of approximately 450bp. Which would NOT explain why bacterial promoters are shorter than the typical eukaryotic promoter? a. Bacteria do not have nucleosomes b. Bacteria do not have mediator complex c. Each operon is regulated by only one signal d. All of the above are truearrow_forwardWhat is the effect of a mutation in the allosteric site of the Lac Repressor protein? A) The Lac Operon would always be expressed whenever glucose is absent. B) The Lac Operon would never be expressed in any environment. C) The Lac Operon would be regulated normally. D) The Lac Operon would be never be expressed in lactose but would always be expressed in glucose.arrow_forward
- Which will be bound to the Lac Operon in an environment with lactose and glucose? A) both repressor and CAP B) repressor only C) CAP only D) neither repressor nor CAParrow_forwardIf glucose is absent, but so is lactose, the lac operon will be ________. a. activated b. repressed c. activated, but only partially d. mutatedarrow_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_forward
- In the lac operon, the lac genes are transcribed in the presence of lactose because a RNA polymerase binds to the operator b The repressor can not bind the promoter c Production of the repressor protein is inducible d The inducer binds to the repressor e The inducer binds to the operatorarrow_forwardIn a bacterial operon, the active repressor bind to the A. promoter. B. terminator. C. operator. D. regulator.arrow_forwardA drug inhibits positive regulation of an operon. What is the most likely outcome? a. No mRNA transcription. b. Inhibition of the operon. c. Only a small amount of the protein will be synthesized. d. a and b e. a, b, and c asap , typed onlyarrow_forward
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