Question 1

Since Watson and Crick described the structure of DNA in 1953,which of the following statements might best explain why the function of small RNAs is still being explained?

Accepted Answer

A)  As RNAs have evolved since that time,they have taken on new functions.
B)  Watson and Crick described DNA but did not predict any function for RNA.
C)  The functions of small RNAs could not be approached until the entire human genome was sequenced.
D)  Changes in technology as well as our ability to determine how much of the DNA is expressed have now made this possible.

Question 2

Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome.If she moves the regulatory gene (lac I) ,along with its promoter,to a position some several thousand base pairs away from its normal position,which would you expect to occur?

Accepted Answer

A)  The repressor will no longer be made.
B)  The repressor will no longer bind to the operator.
C)  The repressor will no longer bind to the inducer.
D)  The lac operon will function normally.

Question 3

A type of mutation in bacteria in the repressor results in a molecule known as a super-repressor because it represses the lac operon permanently.Which of the following processes would occur in such a mutant?

Accepted Answer

A)  The repressor protein cannot bind to the operator.
B)  A functional repressor protein is produced.
C)  The repressor protein cannot bind the inducer.
D)  The lac operon will be transcribed continuously.

Question 4

Transcription factors in eukaryotes usually have DNA-binding domains as well as other domains that are specific for binding other molecules.In general,which of the following would you expect many of them to be able to bind?

Accepted Answer

A)  repressors
B)  protein-based hormones
C)  other transcription factors
D)  tRNA

Question 5

One way scientists hope to use the recent knowledge gained about noncoding RNAs lies with the possibilities for their use in medicine.Of the following scenarios for future research,which would you expect to gain most from RNAs?

Accepted Answer

A)  exploring a way to turn on the expression of introns
B)  targeting siRNAs to disable the expression of an allele associated with an autosomal recessive disease
C)  targeting siRNAs to disable the expression of an allele associated with an autosomal dominant disease
D)  creating organisms that can be useful for pharmaceutical drug design

Question 6

Which of the following statements correctly describes the role of histone acetylation and DNA methylation in gene regulation?

Accepted Answer

A)  DNA methylation reduces transcription,and histone acetylation promotes transcription.
B)  DNA methylation promotes transcription,and histone acetylation reduces transcription.
C)  DNA methylation and histone acetylation both promote transcription.
D)  DNA methylation and histone acetylation both reduce transcription.

Question 7

Which of the following environments would most likely lead to the transcription of the lactose operon?

Accepted Answer

A)  There is more glucose in the cell than lactose.
B)  The cyclic AMP levels are low.
C)  There is glucose but no lactose in the cell.
D)  The cyclic AMP and lactose levels are both high within the cell.
E)  The cAMP level is high and the lactose level is low.

Question 8

Which of the following processes do steroid hormones carry out to produce their effects?

Accepted Answer

A)  They activate key enzymes in metabolic pathways.
B)  They activate translation of certain mRNAs.
C)  They promote the breakdown of specific mRNAs.
D)  They bind to receptors inside the cell and promote transcription of specific genes.

Exam 15: Regulation of Gene Expression

Correct Answer
verified

A type of mutation in bacteria in the repressor results in a molecule known as a super-repressor because it represses the lac operon permanently.Which of the following processes would occur in such a mutant?

Correct Answer
verified

Which of the following processes do steroid hormones carry out to produce their effects?

Correct Answer
verified

Which of the following statements correctly describes the role of histone acetylation and DNA methylation in gene regulation?

Correct Answer
verified

Since Watson and Crick described the structure of DNA in 1953,which of the following statements might best explain why the function of small RNAs is still being explained?

Correct Answer
verified

Which of the following environments would most likely lead to the transcription of the lactose operon?

Correct Answer
verified

Transcription factors in eukaryotes usually have DNA-binding domains as well as other domains that are specific for binding other molecules.In general,which of the following would you expect many of them to be able to bind?

Correct Answer
verified

One way scientists hope to use the recent knowledge gained about noncoding RNAs lies with the possibilities for their use in medicine.Of the following scenarios for future research,which would you expect to gain most from RNAs?

Correct Answer
verified

Exam 15: Regulation of Gene Expression

Correct AnswerverifiedShow Answer

A type of mutation in bacteria in the repressor results in a molecule known as a super-repressor because it represses the lac operon permanently.Which of the following processes would occur in such a mutant?

Correct AnswerverifiedShow Answer

Which of the following processes do steroid hormones carry out to produce their effects?

Correct AnswerverifiedShow Answer

Which of the following statements correctly describes the role of histone acetylation and DNA methylation in gene regulation?

Correct AnswerverifiedShow Answer

Since Watson and Crick described the structure of DNA in 1953,which of the following statements might best explain why the function of small RNAs is still being explained?

Correct AnswerverifiedShow Answer

Which of the following environments would most likely lead to the transcription of the lactose operon?

Correct AnswerverifiedShow Answer

Transcription factors in eukaryotes usually have DNA-binding domains as well as other domains that are specific for binding other molecules.In general,which of the following would you expect many of them to be able to bind?

Correct AnswerverifiedShow Answer

One way scientists hope to use the recent knowledge gained about noncoding RNAs lies with the possibilities for their use in medicine.Of the following scenarios for future research,which would you expect to gain most from RNAs?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified