Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 10, Problem 13SQ
Summary Introduction
Concept introduction: Operons are the set of genes containing a promoter and one or more operator that helps to control the transcription process. A type of operon called lac operon which can occur in the bacteria is used to
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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
Genetics: Operon
In order for the lac operon to be triggered, lactose must be present and ________.
a.
cAMP levels low
b.
glucose stores depleted
c.
glucose levels high
Chapter 10 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 10 - Effect of Paternal Grandmother's Food Supply on...Ch. 10 - Effect of Paternal Grandmother's Food Supply on...Ch. 10 - Effect of Paternal Grandmother's Food Supply on...Ch. 10 - Gene expression does not vary by ___ . a. cell...Ch. 10 - Binding or ___ to ___ in DNA can increase the rate...Ch. 10 - Muscle cells differ from bone cells because they...Ch. 10 - Prob. 4SQCh. 10 - Mechanisms that govern gene expression do not...Ch. 10 - Prob. 6SQCh. 10 - Prob. 7SQ
Ch. 10 - Prob. 8SQCh. 10 - Which of the following includes all of the others?...Ch. 10 - Prob. 10SQCh. 10 - Prob. 11SQCh. 10 - A cell with a Barr body is ___ . a. a bacterium b....Ch. 10 - Prob. 13SQCh. 10 - Which of the following statements is incorrect? a....Ch. 10 - Prob. 15SQCh. 10 - Explain why somebut not allof an organism's genes...Ch. 10 - Do the same mechanisms that govern gene expression...Ch. 10 - Prob. 3CTCh. 10 - The photos below show flowers from two Arabidopsis...
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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_forward. The tryptophan operon is usually in the _______position and is inhibited by a/an_______ molecule. on, repressor off, inducer on, inducer off, repressorarrow_forwardA double stranded region of RNA that can stall ribosomes is a(n) A. repressor sequence B. operator sequence C. antiterminator hairpin D. terminator hairpinarrow_forward
- If tryptophan is presence in the culture media of E.coli then _________. the promoter will be accessed by the RNA polymerase the repressor will bind to the operator the structural genes of the trp operon will be expressed tryptophan will be synthesizedarrow_forwardGenes of related function frequently cluster into: please explain the answer a.transcripts b.oligomers c.operons d. operatorsarrow_forwardThe RNA-induced silencing complex (RISC) _____i. Binds to and unwinds ds siRNA/miRNA to produce ss siRNAs/miRNAii. Creates a block and inhibits translation when the ss siRNA matches the mRNAiii. Mediates the degradation of the siRNA or miRNA to repress gene expression a. I onlyb. II onlyc. I and IId. II and IIIarrow_forward
- 1. What is the default state of the lac operon? a. LacI repressor is sitting on the operator sequence and blocks RNAP from transcribing lacZYA. b. LacI repressor is not in a correct shape to bind to the operator sequence. c. LacI repressor is not produced in the absence of lactose. d. Allolactose is sitting on the operator sequence and blocks RNAP from transcribing lacZYA.arrow_forward1. A strain of E. coli is genetically engineered in which the lacZ and lacY removed and replaced with a gene encoding a fluorescent protein. In addition, scientist produced a partial diploid E. coli strain, i.e. bacteria that have one full copy of the lac operon in their chromosome plus another copy of the lac operon in a plasmid. The modified bacteria have the follow genetic components: genes are One copy of the operon in which the protein product fluoresces green is inserted into the bacteria chromosome One copy of the operon in which the protein product fluoresces red is inserted into a plasmid. Both copies of the lac operon carry one copy of wild-type Promoter (lacP) and Operator (lacO) cis-acting DNA sequences. The modified bacteria have only one copy of the lacI repressor gene in their chromosomes. The lac operon in the plasmid doesn't have the lacI gene. If both fluorescent proteins are expressed, the cells fluoresce yellow and if neither of the fluorescent proteins is…arrow_forwardThe regulation of the trp operon genes by the Trp repressor protein is an example of ______ gene regulation. A.)positive B.)negativearrow_forward
- An activator is to an enhancer as a(n) ____ is to a silencer. Mediator Repressor Inducer Transcription factorarrow_forwardMatch the sequence to its function. Promoter Start codon Regulatory gene Operator Structural gene A. Encodes protein controlled by operon B. Encodes repressor C. Binding site for repressor D. Binding site for RNA polymerase E. Binding site for ribosomesarrow_forwardIn the trp operon, tryptophan is best characterized as being a: A. repressor B. inducer C. corepressor D. DNA-binding domainarrow_forward
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