True or false: repressible positive regulation occurs when the gene is transcribed in the presence of a specific small molecule?判断题

题目图片
A

True

B

False

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LAC OPERON STRUCTURE The L A C operon has a region labeled Regulatory Gene that contains loci P subscript 1 and l a c 1. The L A C operon has a 2nd, separate region that contains five loci, in order from left to right on the DNA strand, P subscript l a c, operator, l a c Z, l a c Y, l a c A. The functions of the loci of the lac operon shown in the diagram are described in the table below. Functions of the loci of the lac operon Locus Function PI Attachment site for RNA polymerase lacI Encodes a repressor protein that prevents transcription of the structural genes of the lac operon Plac Attachment site for RNA polymerase Operator Binding site for the repressor protein lacZ Encodes beta-galactosidase, the enzyme that digests lactose to glucose and galactose lacY Encodes lactose permease, the channel through which lactose moves into the cell lacA Encodes galactoside transacetylase The diagram above represents a segment of the E. coli chromosome that contains the lacI gene and part of the lac operon, a coordinately regulated set of genes that are required for the metabolism of lactose. The presence of lactose, which causes the repressor to be released from the operator, results in increased transcription of the lac operon. Which of the following best explains the contribution of the lac operon to the metabolic efficiency of a bacterial cell?

The table below describes the action of two genes involved in the regulation of nervous system development in the nematode C. elegans. C. elegans nervous system regulation genes Gene A Gene B Observation Pattern 1 Inactive Inactive No neurons develop Pattern 2 Inactive Active No neurons develop Pattern 3 Active Inactive Greater-than-normal number of neurons develop Pattern 4 Active Active Normal number of neurons develop Which of the following claims is best supported by the data?

True or false: inducible negative regulation occurs when the gene is not transcribed in the presence of a specific small molecule?

The trp operon is an example of a Blank 1 Question 13[select: , negative repressible, operator, blocks, enhances, promotor, negative inducible, positive repressible, positive inducible, activator] operon. This is because its regulatory region contains an Blank 2 Question 13[select: , negative repressible, operator, blocks, enhances, promotor, negative inducible, positive repressible, positive inducible, activator] , which suppresses transcription and because binding of tryptophan to the repressor protein Blank 3 Question 13[select: , negative repressible, operator, blocks, enhances, promotor, negative inducible, positive repressible, positive inducible, activator] transcription.

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