Question 1

Epigenetics is defined as changes in the expression of a gene or set of genes by _______ and _______.

Accepted Answer

A)  transcription factors; DNA methylation 
B)  chromosomal protein alteration; transcription factors 
C)  DNA methylation; chromosomal protein alteration 
D)  promoters; DNA methylation 
E)  promoters; chromosomal protein alteration 
A)  transcription factors; DNA methylation 
B)  chromosomal protein alteration; transcription factors 
C)  DNA methylation; chromosomal protein alteration 
D)  promoters; DNA methylation 
E)  promoters; chromosomal protein alteration

Question 2

Which of the following mechanisms of posttranscriptional regulation of gene expression can produce several different proteins from a single gene?

Accepted Answer

A)  microRNAs 
B)  protein degradation 
C)  protein phosphorylation 
D)  alternative splicing 
E)  regulation of translation 
A)  microRNAs 
B)  protein degradation 
C)  protein phosphorylation 
D)  alternative splicing 
E)  regulation of translation

Question 3

Bacterial viruses (phage)

Accepted Answer

A)  can reproduce on their own. 
B)  require a host cell to replicate. 
C)  carry out metabolism. 
D)  have a plasma membrane. 
E)  are alive. 
A)  can reproduce on their own. 
B)  require a host cell to replicate. 
C)  carry out metabolism. 
D)  have a plasma membrane. 
E)  are alive.

Question 4

In DNA, 5-methylcytosine

Accepted Answer

A)  forms a base pair with adenine. 
B)  is not recognized by DNA polymerase. 
C)  is related to transcriptional silencing of genes. 
D)  does not occur at promoters. 
E)  is an irreversible modification of cytosine. 
A)  forms a base pair with adenine. 
B)  is not recognized by DNA polymerase. 
C)  is related to transcriptional silencing of genes. 
D)  does not occur at promoters. 
E)  is an irreversible modification of cytosine.

Question 5

In a repressible operon, the repressor molecule

Accepted Answer

A)  must first be activated by a co-repressor. 
B)  can repress the transcription of the operon on its own. 
C)  is a molecule made from the operon. 
D)  binds to the mRNA. 
E)  must first be made negative to control the operon. 
A)  must first be activated by a co-repressor. 
B)  can repress the transcription of the operon on its own. 
C)  is a molecule made from the operon. 
D)  binds to the mRNA. 
E)  must first be made negative to control the operon.

Question 6

Use the following to answer questions:
Refer to the diagram below.  
-Which of the following represents the regulatory sequence of the DNA?

Accepted Answer

A)  TATAT 
B)  ATATA 
C)  TFIID 
D)  BFEH 
E)  TFIID + B 
A)  TATAT 
B)  ATATA 
C)  TFIID 
D)  BFEH 
E)  TFIID + B

Question 7

Use the following to answer questions:
Refer to the diagram below.  
-The only transcription factor(s) that bind(s) directly to DNA is/are

Accepted Answer

A)  B. 
B)  F. 
C)  E and H 
D)  TFIID 
E)  B and H. 
A)  B. 
B)  F. 
C)  E and H 
D)  TFIID 
E)  B and H.

Question 8

During lysogeny

Accepted Answer

A)  the viral DNA is present as a self-replicating plasmid. 
B)  the host bacterium is usually adversely affected. 
C)  the host's gene expression is inhibited. 
D)  the viral DNA is lost in a few generations. 
E)  the viral genome is integrated into the host's genome. 
A)  the viral DNA is present as a self-replicating plasmid. 
B)  the host bacterium is usually adversely affected. 
C)  the host's gene expression is inhibited. 
D)  the viral DNA is lost in a few generations. 
E)  the viral genome is integrated into the host's genome.

Question 9

The lac operon of E. coli consists of

Accepted Answer

A)  a segment of DNA. 
B)  a promoter. 
C)  an operator. 
D)  three structural genes. 
E)  All of the above 
A)  a segment of DNA. 
B)  a promoter. 
C)  an operator. 
D)  three structural genes. 
E)  All of the above

Question 10

The expression of the lac structural genes is _______ when lactose is absent from the culture medium and is _______ when lactose is added because lactose binds to the _______ and inactivates it.

Accepted Answer

A)  low; high; lac repressor 
B)  high; low; lac inducer 
C)  low; high; lac promoter 
D)  high; low; lac operator 
E)  low; high; lac operator 
A)  low; high; lac repressor 
B)  high; low; lac inducer 
C)  low; high; lac promoter 
D)  high; low; lac operator 
E)  low; high; lac operator

Question 11

Mary Lyon, Liane Russell, and Ernest Beutler discovered

Accepted Answer

A)  the basis of hormone action. 
B)  X chromosome inactivation. 
C)  Barr bodies. 
D)  melanosomes. 
E)  heterochromatin. 
A)  the basis of hormone action. 
B)  X chromosome inactivation. 
C)  Barr bodies. 
D)  melanosomes. 
E)  heterochromatin.

Exam 16: Regulation of Gene Expression

Epigenetics is defined as changes in the expression of a gene or set of genes by _______ and _______.

Which of the following mechanisms of posttranscriptional regulation of gene expression can produce several different proteins from a single gene?

Bacterial viruses (phage)

In DNA, 5-methylcytosine

In a repressible operon, the repressor molecule

Use the following to answer questions: Refer to the diagram below. -Which of the following represents the regulatory sequence of the DNA?

Use the following to answer questions: Refer to the diagram below. -The only transcription factor(s) that bind(s) directly to DNA is/are

During lysogeny

The lac operon of E. coli consists of

The expression of the lac structural genes is _______ when lactose is absent from the culture medium and is _______ when lactose is added because lactose binds to the _______ and inactivates it.

Mary Lyon, Liane Russell, and Ernest Beutler discovered

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Filters

Epigenetics is defined as changes in the expression of a gene or set of genes by _ and _.

The expression of the lac structural genes is ___ when lactose is absent from the culture medium and is _ when lactose is added because lactose binds to the _____ and inactivates it.