Question 1

Which of the following statements is true regarding dosage compensation?

Accepted Answer

A)  In Drosophila,one of the two X-chromosomes is randomly inactivated in females. 
B)  In mammals,the genes on the single X-chromosome in a male are transcribed at a higher level. 
C) The X-inactive specific transcript is a functional RNA molecule that results in X-inactivation in Drosophila. 
D)  In C.elegans,dosage compensation results from partial repression of X-linked genes in hermaphrodites. 
E)  The gene product of the gene maleless is responsible for X-inactivation in mammals. 
A)  In Drosophila,one of the two X-chromosomes is randomly inactivated in females. 
B)  In mammals,the genes on the single X-chromosome in a male are transcribed at a higher level. 
C) The X-inactive specific transcript is a functional RNA molecule that results in X-inactivation in Drosophila. 
D)  In C.elegans,dosage compensation results from partial repression of X-linked genes in hermaphrodites. 
E)  The gene product of the gene maleless is responsible for X-inactivation in mammals.

Question 2

How does alternative splicing help to modify RNA transcripts in eukaryotes.Explain your answer by using a real life example such as that of the troponin T gene in rats.

Accepted Answer

One example of alternate splicing occurs

Question 3

Which of the following is not true regarding steroid hormones?

Accepted Answer

A)  They are small, lipid-soluble molecules derived from cholesterol. 
B)  Insulin is an example. 
C)  Testosterone and estrogen are examples. 
D)  The have little or no trouble passing through cell membranes. 
E)  They interact with cytoplasmic or nuclear proteins called hormone receptors. 
A)  They are small, lipid-soluble molecules derived from cholesterol. 
B)  Insulin is an example. 
C)  Testosterone and estrogen are examples. 
D)  The have little or no trouble passing through cell membranes. 
E)  They interact with cytoplasmic or nuclear proteins called hormone receptors.

Question 4

Which of the following is true about signal transduction by hormones?

Accepted Answer

A)  All hormones are linear chains of amino acids (peptides). 
B)  Hormones can diffuse freely in and out of cells. 
C)  Steroid hormone-receptor complexes can enter the cell nucleus. 
D)  Peptide hormones directly act on DNA to stimulate transcription. 
E)  Binding of a peptide hormone to its receptor causes a conformational change in the hormone molecule. 
A)  All hormones are linear chains of amino acids (peptides). 
B)  Hormones can diffuse freely in and out of cells. 
C)  Steroid hormone-receptor complexes can enter the cell nucleus. 
D)  Peptide hormones directly act on DNA to stimulate transcription. 
E)  Binding of a peptide hormone to its receptor causes a conformational change in the hormone molecule.

Question 5

Which of the following genes is expressed in reaction to the exposure of light?

Accepted Answer

A)  Troponin T 
B)  HSPs 
C)  rbcS 
D)  Sxl 
E)  None of these are correct. 
A)  Troponin T 
B)  HSPs 
C)  rbcS 
D)  Sxl 
E)  None of these are correct.

Question 6

Which type of enzyme produces siRNA molecules in eukaryotes?

Accepted Answer

A)  Restriction exonucleases 
B)  DNA restriction endonucleases 
C)  Dicer enzymes 
D)  Regulator enzymes 
E)  RNA polymerase 
A)  Restriction exonucleases 
B)  DNA restriction endonucleases 
C)  Dicer enzymes 
D)  Regulator enzymes 
E)  RNA polymerase

Question 7

Which of the following molecules participates in RNA interference?

Accepted Answer

A)  siRNA 
B)  tRNA 
C)  rRNA 
D)  dsDNA 
E)  All of these are correct. 
A)  siRNA 
B)  tRNA 
C)  rRNA 
D)  dsDNA 
E)  All of these are correct.

Question 8

DNA regions which are locally unwound because transcription has begun,and which are sensitive to low doses of DNAse 1 are known as

Accepted Answer

A)  RNase hypersensitive sites. 
B)  RNase hyposensitive sites. 
C)  DNase 1 hypersensitive sites. 
D)  DNase 1 hyposensitive sites. 
E)  None of these are correct. 
A)  RNase hypersensitive sites. 
B)  RNase hyposensitive sites. 
C)  DNase 1 hypersensitive sites. 
D)  DNase 1 hyposensitive sites. 
E)  None of these are correct.

Question 9

Which of the following is true regarding eukaryotic transcription factors?

Accepted Answer

A)  Most eukaryotes have only one or a few transcription factors. 
B)  Many transcription factors have dimerization motifs. 
C)  Eukaryotic transcriptional activation does not require protein-protein interactions. 
D)  Transcription factors can be active only when they form homodimers. 
E)  Homeodomains are a class of transcription factors. 
A)  Most eukaryotes have only one or a few transcription factors. 
B)  Many transcription factors have dimerization motifs. 
C)  Eukaryotic transcriptional activation does not require protein-protein interactions. 
D)  Transcription factors can be active only when they form homodimers. 
E)  Homeodomains are a class of transcription factors.

Question 10

Enhancers are

Accepted Answer

A)  domains in proteins that enhance gene transcription. 
B)  special cis regions in the vicinity of a gene to which transcription factors bind. 
C)  also capable of inhibiting gene transcription. 
D)  regions along a promoter to which basal transcription factors bind. 
E)  not able to act over long distances away from the gene. 
A)  domains in proteins that enhance gene transcription. 
B)  special cis regions in the vicinity of a gene to which transcription factors bind. 
C)  also capable of inhibiting gene transcription. 
D)  regions along a promoter to which basal transcription factors bind. 
E)  not able to act over long distances away from the gene.

Question 11

Which of the following is a mechanism of dosage compensation?

Accepted Answer

A)  Inactivation 
B)  Hyperactivation 
C)  Hypoactivation 
D)  All of these are correct. 
E)  None of these are correct. 
A)  Inactivation 
B)  Hyperactivation 
C)  Hypoactivation 
D)  All of these are correct. 
E)  None of these are correct.

Which of the following statements is true regarding dosage compensation?

How does alternative splicing help to modify RNA transcripts in eukaryotes.Explain your answer by using a real life example such as that of the troponin T gene in rats.

Which of the following is not true regarding steroid hormones?

Which of the following is true about signal transduction by hormones?

Which of the following genes is expressed in reaction to the exposure of light?

Which type of enzyme produces siRNA molecules in eukaryotes?

Which of the following molecules participates in RNA interference?

DNA regions which are locally unwound because transcription has begun,and which are sensitive to low doses of DNAse 1 are known as

Which of the following is true regarding eukaryotic transcription factors?

Enhancers are

Which of the following is a mechanism of dosage compensation?

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Exam 19: Regulation Of Gene Expression In Eukaryotes

Which of the following statements is true regarding dosage compensation?

How does alternative splicing help to modify RNA transcripts in eukaryotes.Explain your answer by using a real life example such as that of the troponin T gene in rats.

Which of the following is not true regarding steroid hormones?

Which of the following is true about signal transduction by hormones?

Which of the following genes is expressed in reaction to the exposure of light?

Which type of enzyme produces siRNA molecules in eukaryotes?

Which of the following molecules participates in RNA interference?

DNA regions which are locally unwound because transcription has begun,and which are sensitive to low doses of DNAse 1 are known as

Which of the following is true regarding eukaryotic transcription factors?

Enhancers are

Which of the following is a mechanism of dosage compensation?

The Science Of Genetics

Cellular Reproduction

Mendelism The Basic Principles Of Inheritance

Extensions Of Mendelism

The Chromosomal Basis Of Mendelism

Variation In Chromosome Number And Structure

Linkage,Crossing Over,And Chromosome Mapping In …

The Genetics Of Bacteria And Their Viruses

DNA And The Molecular Structure Of Chromosomes

Replication Of DNA And Chromosomes

Transcription And RNA Processing

Translation And The Genetic Code

Mutation,DNA Repair,And Recombination

The Techniques Of Molecular Genetics

Genomics

Applications Of Molecular Genetics

Transposable Genetics Elements

Regulation Of Gene Expression In Prokaryotes

The Genetic Control Of Animal Development

The Genetic Basis Of Cancer

Inheritance Of Complex Traits

Population Genetics

Evolutionary Genetics

Filters