Question 1

Which of the following is true about oncogenes?

Accepted Answer

A)   Oncogenes are normal genes that have undergone a mutation.
B)   Oncogenes cause cell division to slow down.
C)   When mutated, oncogenes turn into proto-oncogenes.
D)   Oncogenes increase apoptosis in surrounding cells.
E)   All of the answer choices are true statements about oncogenes.F) A) and C)
G) C) and D)

Question 2

Which of the following is a frameshift mutation of the nucleotide sequence CATUAUCCC?

Accepted Answer

A)   CATTUAUCCC
B)   ATUAUCCC
C)   CTUAUCCC
D)   CATUAUCGC
E)   All of the answer choices are frameshift mutations.F) A) and D)
G) A) and B)

Question 3

The function of the regulator gene is to

Accepted Answer

A)   code for enzymes in a metabolic pathway.
B)   serve as an on/off switch for transcription.
C)   code for a repressor molecule that can bind to the operator.
D)   bind to the RNA polymerase molecule.
E)   bind to the promoter.F) A) and B)
G) B) and D)

Question 4

If the protein coat of a virus that infects a bacterium is labeled with radioactive sulfur while the DNA of the virus is labeled with radioactive phosphorus, over time

Accepted Answer

A)   both the sulfur and the phosphorus will be found within the bacterium.
B)   only the sulfur will be found inside the bacterium.
C)   only the phosphorus will be found inside the bacterium.
D)   both the sulfur and the phosphorus will be found outside the bacterium.
E)   the radioactivity of the sulfur and phosphorus will decay very quickly and not be detectable.F) A) and E)
G) D) and E)

Question 5

Which of the following occurs when lactose is present in the environment of E. coli?

Accepted Answer

A)   The lac repressor binds to the promoter.
B)   RNA polymerase binds to the operator.
C)   No genes are transcribed.
D)   RNA polymerase binds to the promotor.
E)   Lactose binds to the promotor.F) All of the above
G) A) and B)

Question 6

Which of the following is true about RNA?

Accepted Answer

A)   The structure is a double helix.
B)   The bases are held together by hydrogen bonds.
C)   The bases are complementary to each other.
D)   It contains deoxyribose sugar.
E)   It is composed of the nucleotides adenine, guanine, cytosine, and uracil.F) A) and C)
G) C) and D)

Question 7

The site of translation is the

Accepted Answer

A)   nucleus.
B)   nucleolus.
C)   ribosome.
D)   ribozyme.
E)   mitochondria.F) C) and D)
G) A) and D)

Question 8

Identify the amino acids that would be assembled based upon the following codons: CGG AUA GAC GUA.

Accepted Answer

CGG would code for arginine.
A...

Question 9

An oncogene is

Accepted Answer

A)   a viral gene with no relation to the host cell's genes.
B)   a mutated form of a proto-oncogene.
C)   a bacterial gene that causes cancer in the host.
D)   always seen in human cancer cells.
E)   a gene that turns off cellular reproduction.F) A) and C)
G) A) and E)

Question 10

Messenger RNA is produced in the

Accepted Answer

A)   cytoplasm.
B)   ribosomes.
C)   nucleus.
D)   endoplasmic reticulum.
E)   lysosome.F) D) and E)
G) A) and E)

Question 11

What are transcription factors?

Accepted Answer

A)   Transcription factors are proteins that help the repressor bind to the operator.
B)   Transcription factors are proteins that help RNA polymerase bind to the promoter.
C)   Transcription factors are proteins that help DNA polymerase bind to the promoter.
D)   Transcription factors are proteins that help helicases bind to the operator.
E)   Transcription factors are proteins that help the operator bind to the repressor.F) A) and B)
G) A) and C)

Question 12

During translation, which of the following is involved in translation?

Accepted Answer

A)   mRNA
B)   tRNA
C)   rRNA
D)   ribosome
E)   All of the answer choices are involved in translation.F) B) and D)
G) C) and D)

Question 13

In eukaryotes, control of gene expression is accomplished by

Accepted Answer

A)   translational control in cytoplasm after mRNA leaves the nucleus and before protein is produced.
B)   transcriptional control in the nucleus based on which genes are transcribed and how fast they are transcribed.
C)   posttranscriptional control in the nucleus after DNA is transcribed, including the speed with which mRNA leaves the nucleus.
D)   posttranslational control in the cytoplasm that occurs after protein synthesis.
E)   All of the answer choices are correct.F) C) and E)
G) B) and C)

Question 14

When the sheep Dolly was successfully cloned, it was produced by growing an in vitro fertilized egg where the normal egg nucleus had been removed and replaced by a nucleus from an adult. Since this nucleus was from an older mature animal, which of the following would be a reasonable expectation?

Accepted Answer

A)   The nucleus from the older mature animal would have additional Barr bodies.
B)   The nucleus from the older mature animal would contain DNA with many mutations.
C)   The nucleus from the older mature animal would contain chromosomes with shorter telomeres.
D)   The nucleus from the older mature animal would have chromosomes with longer telomeres.
E)   The nucleus from the older mature animal would have a higher concentration of mRNA.F) A) and E)
G) A) and D)

Question 15

Initiation, elongation, and termination are three stages in

Accepted Answer

A)   DNA replication.
B)   error correction by proofreading enzymes.
C)   mRNA processing.
D)   translation.
E)   intron removal.F) All of the above
G) B) and C)

Question 16

Apoptosis refers to cell death and

Accepted Answer

A)   is always biologically detrimental to an organism.
B)   can be programmed and is essential to normal development.
C)   is the accumulation of genetic errors.
D)   is a failure in the translation or transcription mechanism.
E)   is any failure of the genetic machinery to work correctly.F) A) and D)
G) B) and E)

Question 17

Which of the following processes takes place during transcription?

Accepted Answer

A)   attachment of a ribosome to mRNA
B)   growth of a polypeptide chain
C)   binding of two tRNA molecules/ribosome
D)   liberation of polypeptide from ribosome
E)   production of mRNAF) A) and B)
G) All of the above

Question 18

Transcription of part of a DNA molecule with a nucleotide sequence of AAACAACTT results in a mRNA molecule with the complementary sequence of

Accepted Answer

A)   GGGAGAACC.
B)   UUUGUUGAA.
C)   TTTGAAGCC.
D)   CCCACCTCC.
E)   AAACAACTT.F) A) and D)
G) C) and E)

Question 19

Which of the classes of RNA molecules is produced in the nucleolus?

Accepted Answer

A)   ribosomal RNA
B)   transfer RNA
C)   messenger RNA
D)   primary mRNA transcript
E)   ribozymesF) D) and E)
G) B) and D)

Question 20

What part of a tRNA molecule will base pair with the codon of a mRNA molecule?

Accepted Answer

A)   DNA sequence
B)   anticodon
C)   amino acid binding site
D)   amino acid
E)   promoter siteF) B) and D)
G) A) and E)

Exam 25: Dna Structure and Gene Expression

Apoptosis refers to cell death and

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What part of a tRNA molecule will base pair with the codon of a mRNA molecule?

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In eukaryotes, control of gene expression is accomplished by

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Identify the amino acids that would be assembled based upon the following codons: CGG AUA GAC GUA.

Correct AnswerverifiedCGG would code for arginine.A...View AnswerShow Answer

Initiation, elongation, and termination are three stages in

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The site of translation is the

Correct AnswerverifiedShow Answer

Which of the following is a frameshift mutation of the nucleotide sequence CATUAUCCC?

Correct AnswerverifiedShow Answer

When the sheep Dolly was successfully cloned, it was produced by growing an in vitro fertilized egg where the normal egg nucleus had been removed and replaced by a nucleus from an adult. Since this nucleus was from an older mature animal, which of the following would be a reasonable expectation?

Correct AnswerverifiedShow Answer

Messenger RNA is produced in the

Correct AnswerverifiedShow Answer

Transcription of part of a DNA molecule with a nucleotide sequence of AAACAACTT results in a mRNA molecule with the complementary sequence of

Correct AnswerverifiedShow Answer

Which of the classes of RNA molecules is produced in the nucleolus?

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An oncogene is

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Which of the following is true about oncogenes?

Correct AnswerverifiedShow Answer

Which of the following processes takes place during transcription?

Correct AnswerverifiedShow Answer

The function of the regulator gene is to

Correct AnswerverifiedShow Answer

During translation, which of the following is involved in translation?

Correct AnswerverifiedShow Answer

Which of the following occurs when lactose is present in the environment of E. coli?

Correct AnswerverifiedShow Answer

What are transcription factors?

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If the protein coat of a virus that infects a bacterium is labeled with radioactive sulfur while the DNA of the virus is labeled with radioactive phosphorus, over time

Correct AnswerverifiedShow Answer

Which of the following is true about RNA?

Correct AnswerverifiedShow Answer

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CGG would code for arginine.
A...
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