Question 1

Artificial RNA with a known base sequence was added to a medium containing bacterial ribosomes and a mixture of amino acids.By chemical identification of the resulting polypeptide,researchers could discover the

Accepted Answer

A)  transcription factors involved.
B)  mutation rate.
C)  codon.
D)  Chargaff rule.
E)  difference between DNA and RNA.F) B) and C)
G) A) and E)

Question 2

If the protein coat of a virus that infects a bacterium is labeled with radioactive sulfur and 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 B)
G) All of the above C

Question 3

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) A) and E)
G) B) and E)

Question 4

In Figure 25.4,if adenine is located on strand 4,then on strand 2 at the same location ____ must be present.

Accepted Answer

A)  adenine
B)  thymine
C)  cytosine
D)  guanine
E)  uracilF) A) and B)
G) A) and E)

Question 5

The enzyme that is used to join complementary DNA nucleotides together is

Accepted Answer

A)  DNA polymerase.
B)  RNA polymerase.
C)  helicase.
D)  ribozyme.
E)  lipase.F) A) and E)
G) A) and D)

Question 6

Which statement is NOT correct about the results of the Hershey-Chase experiment with the T2 virus?

Accepted Answer

A)  Radioactively labeled protein was found in the bacteria,not in the virus coats.
B)  Radioactively labeled DNA was found in the bacteria,not in the virus coats.
C)  DNA was labeled with radioactive phosphorus.
D)  Protein was labeled with radioactive sulfur.
E)  Two separate experiments were actually run,one with radioactive phosphorus and one with radioactive sulfur.F) A) and E)
G) A) and B)

Question 7

The individual(s) credited with the discovery of the structure of DNA is (are)

Accepted Answer

A)  Alfred Hershey and Martha Chase.
B)  James Watson and Francis Crick.
C)  Erwin Chargaff.
D)  Rosalind Franklin and Maurice Wilkins.
E)  Charles Darwin and Gregor Mendel.F) All of the above
G) B) and C)

Question 8

An oncogene is

Accepted Answer

A)  a viral gene with no relation to the host cells 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 B)
G) A) and C)

Question 9

Which of the following serve to directly accelerate the cell cycle?

Accepted Answer

A)  tumor suppressor genes
B)  carcinogens
C)  repressors
D)  oncogene proteins
E)  p53 geneF) None of the above
G) C) and E) D

Question 10

Which of the following statements about DNA replication is NOT correct?

Accepted Answer

A)  Unwinding of the DNA molecule occurs as hydrogen bonds break.
B)  Replication occurs as each base is paired with another exactly like it.
C)  The process is known as semi-conservative replication because one old strand is conserved in the new molecule.
D)  The enzyme that catalyzes DNA replication is DNA polymerase.
E)  Complementary base pairs are held together with hydrogen bonds.F) A) and B)
G) A) and C)

Question 11

Which does NOT describe a function of the DNA polymerase molecule?

Accepted Answer

A)  recognize the free nucleotide that pairs with the base on the old strand of DNA
B)  read the strand of old DNA and recognize the base there
C)  proofread to ensure that the proper base has been incorporated
D)  make the proper nucleotide to match with the base read on the old strand
E)  nucleotides are joined by hydrogen bondsF) C) and D)
G) All of the above

Question 12

The addition of a poly-A tail to mRNA occurs after which of the following?

Accepted Answer

A)  replication
B)  transcription
C)  translation
D)  translocation
E)  terminationF) C) and D)
G) A) and C) B

Question 13

A cluster of prokaryotic genes under the control of one regulatory sequence is called a(n)

Accepted Answer

A)  repressor.
B)  promoter.
C)  operon.
D)  operator.
E)  regulator gene.F) A) and B)
G) All of the above

Question 14

Which of the following is NOT true about DNA?

Accepted Answer

A)  has a double helix
B)  bases held together by hydrogen bonds
C)  bases are complementary to each other
D)  has a deoxyribose sugar
E)  contains adenine,guanine,cytosine,and uracilF) None of the above
G) B) and E)

Question 15

Specific DNA sequences that have the ability to move within and out of chromosomes are called

Accepted Answer

A)  transposons.
B)  introns.
C)  exons.
D)  operators.
E)  ribozymes.F) A) and B)
G) C) and E)

Question 16

Which of the following nucleotide bases is found only in DNA,not in RNA?

Accepted Answer

A)  guanine
B)  adenine
C)  thymine
D)  uracil
E)  cytosineF) A) and B)
G) C) and D)

Question 17

Of the following types of RNA,which is one of the determining factors in cell differentiation?

Accepted Answer

A)  tRNA
B)  rRNA
C)  mRNA
D)  No type of RNA is a determing factor in cell differentiation.
E)  cRNAF) A) and D)
G) A) and C)

Question 18

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 D)
G) A) and C)

Question 19

A nucleotide contains

Accepted Answer

A)  DNA and RNA.
B)  a sugar and a phosphate.
C)  complementary purines and pyrimidines.
D)  RNA,protein,and lipids.
E)  a sugar,a phosphate,and a nitrogen base.F) C) and D)
G) A) and C)

Question 20

The correct sequence of events in the production of a polypeptide is

Accepted Answer

A)  initiation →\rightarrow→  termination  →\rightarrow→ elongation.
B)  elongation  →\rightarrow→ termination  →\rightarrow→ initiation.
C)  termination  →\rightarrow→  elongation  →\rightarrow→ initiation.
D)  elongation  →\rightarrow→ initiation  →\rightarrow→ termination.
E)  initiation  →\rightarrow→ elongation →\rightarrow→  termination. F) A) and D)
G) A) and C)

Exam 25: Dna Structure and Control of Gene Expression

Artificial RNA with a known base sequence was added to a medium containing bacterial ribosomes and a mixture of amino acids.By chemical identification of the resulting polypeptide,researchers could discover the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

Initiation,elongation,and termination are three stages in

Correct AnswerverifiedShow Answer

In Figure 25.4,if adenine is located on strand 4,then on strand 2 at the same location ____ must be present.

Correct AnswerverifiedShow Answer

The enzyme that is used to join complementary DNA nucleotides together is

Correct AnswerverifiedShow Answer

Which statement is NOT correct about the results of the Hershey-Chase experiment with the T2 virus?

Correct AnswerverifiedShow Answer

The individual(s) credited with the discovery of the structure of DNA is (are)

Correct AnswerverifiedShow Answer

An oncogene is

Correct AnswerverifiedShow Answer

Which of the following serve to directly accelerate the cell cycle?

Correct AnswerverifiedD

Which of the following statements about DNA replication is NOT correct?

Correct AnswerverifiedShow Answer

Which does NOT describe a function of the DNA polymerase molecule?

Correct AnswerverifiedShow Answer

The addition of a poly-A tail to mRNA occurs after which of the following?

Correct AnswerverifiedB

A cluster of prokaryotic genes under the control of one regulatory sequence is called a(n)

Correct AnswerverifiedShow Answer

Which of the following is NOT true about DNA?

Correct AnswerverifiedShow Answer

Specific DNA sequences that have the ability to move within and out of chromosomes are called

Correct AnswerverifiedShow Answer

Which of the following nucleotide bases is found only in DNA,not in RNA?

Correct AnswerverifiedShow Answer

Of the following types of RNA,which is one of the determining factors in cell differentiation?

Correct AnswerverifiedShow Answer

The function of the regulator gene is to

Correct AnswerverifiedShow Answer

A nucleotide contains

Correct AnswerverifiedShow Answer

The correct sequence of events in the production of a polypeptide is

Correct AnswerverifiedShow Answer

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C

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Which statement is NOT correct about the results of the Hershey-Chase experiment with the T₂ virus?

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D

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B

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