Question 1

What are proteins that initiate transcription in eukaryotes by recognizing sequences within the promoter region of a gene and attracting RNA polymerase?

Accepted Answer

A)  repressors
B)  inducers
C)  transcription factors
D)  TATA boxes
E)  poly A tailsF) A) and E)
G) A) and B)

Question 2

One key reason why viruses are not considered living organisms is

Accepted Answer

A)  viruses do not contain genetic information.
B)  viruses do not reproduce on their own.
C)  viruses are all smaller than the smallest known cells.
D)  viruses do not contain a nucleus.
E)  viruses can be frozen and still survivE.F) A) and B)
G) A) and C)

Question 3

Why would it take more energy to separate DNA with the sequence GCGCGCGC and its complementary strand than the sequence ATATATAT and its complementary strand?

Accepted Answer

A)  A's and T's do not form pairs between separate DNA strands.
B)  The helix is wound more tightly in G and C base pairs.
C)  G and C base pairs form more hydrogen bonds between DNA strands.
D)  The sequence containing G's and C's is longer.
E)  G and C base pairs form more covalent bonds between DNA strands.F) A) and E)
G) D) and E)

Question 4

In eukaryotes,transcription copies only one gene from one DNA strand of the chromosome.

Accepted Answer

A) True 
 B)False

Question 5

In eukaryotic cells,sequences of mRNA removed before translation are called

Accepted Answer

A)  introns.
B)  anticodons.
C)  exons.
D)  rRNA.
E)  terminators.F) C) and D)
G) A) and E)

Question 6

A tRNA molecule is "bilingual" because it binds to

Accepted Answer

A)  amino acids and DNA
B)  DNA and mRNA codons
C)  promoters and amino acids
D)  codons of mRNA and amino acids
E)  promoters and terminatorsF) A) and B)
G) B) and C)

Question 7

The step of translation in which release factors bind to a stop codon is:

Accepted Answer

A)  mitosis.
B)  termination.
C)  initiation.
D)  elongation.
E)  transcription.F) A) and C)
G) B) and E)

Question 8

RNA differs from DNA in many ways,including

Accepted Answer

A)  DNA contains deoxyribose and RNA contains ribose.
B)  DNA contains thymine and RNA contains uracil instead of thymine.
C)  All are correct.
D)  DNA is double stranded and RNA is single strandeD.
E)  RNA can catalyze some chemical reactions and DNA cannot.F) C) and D)
G) A) and B)

Question 9

Viruses always lack which of the following?

Accepted Answer

A)  proteins
B)  genetic material
C)  a protein coat
D)  organelles
E)  All of the choicesF) A) and B)
G) B) and C)

Question 10

Cells have only two copies of most genes,but can make hundreds of copies of a protein from those genes per second,because

Accepted Answer

A)  during translation multiple DNA codons can encode the same amino acid.
B)  during translation multiple copies of the same mRNA can be produced from one gene.
C)  during translation DNA can replicate making more copies of the gene.
D)  during translation proteins can replicate.
E)  during translation multiple ribosomes can bind to the same mRNA simultaneously.F) C) and D)
G) C) and E)

Question 11

The stage of viral replication in which the host cell produces viral nucleic acids and proteins is

Accepted Answer

A)  release.
B)  attachment.
C)  synthesis.
D)  penetration.
E)  assembly.F) C) and E)
G) A) and B)

Question 12

A poly A tail is added to the mature mRNA after transcription.

Accepted Answer

A) True 
 B)False

Question 13

Treatment of a viral infection by inoculating the host with a bacterial virus

Accepted Answer

A)  is chemotherapy.
B)  is phage therapy.
C)  is radiation therapy.
D)  is antibiotic therapy.
E)  None of the answers are correct.F) A) and C)
G) C) and E)

Question 14

Viruses that infect bacteria are:

Accepted Answer

A)  not known to exist.
B)  prions.
C)  bacteriophages.
D)  composed of only proteins.
E)  viroids.F) A) and C)
G) A) and B)

Question 15

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years,and when a patient becomes stressed the virus is released,forming cold sores on the lips.Why would the virus form a cold sore?

Accepted Answer

A)  to spread to a new host
B)  so that it can mutate and survive antibiotic treatment
C)  to become latent in the body
D)  to avoid the immune system
E)  to warn other people that the host is infectedF) B) and C)
G) B) and D)

Question 16

The stage of viral replication in which the viral nucleic acid is released inside the cell is

Accepted Answer

A)  penetration.
B)  release.
C)  attachment.
D)  synthesis.
E)  assembly.F) C) and D)
G) D) and E)

Question 17

The stage of viral replication in which the virus binds to a cell surface receptor is

Accepted Answer

A)  release
B)  penetration
C)  synthesis
D)  attachment
E)  assemblyF) A) and C)
G) B) and C)

Question 18

An infectious protein is a

Accepted Answer

A)  virus.
B)  viroid.
C)  prion.
D)  virion.
E)  prophagE.F) A) and D)
G) B) and E)

Question 19

Which of the following best describes the relationship between DNA,proteins,and RNA?

Accepted Answer

A)  DNA is transcribed into RNA,then RNA is translated into proteins.
B)  DNA is transcribed into proteins,then proteins are translated into RNA.
C)  DNA is translated into RNA,then RNA is transcribed into proteins.
D)  DNA is translated into proteins,then proteins are transcribed into RNA.E) All of the above
F) A) and B)

Question 20

The correct sequence of stages of viral replication is

Accepted Answer

A)  attachment - synthesis - penetration - assembly - release
B)  penetration - attachment - assembly - synthesis - Release
C)  penetration - attachment - synthesis - release - assembly
D)  attachment - penetration - assembly - synthesis - release
E)  attachment - penetration - synthesis - assembly - releaseF) D) and E)
G) None of the above

Exam 7: DNA Structure and Gene Function

An infectious protein is a

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The step of translation in which release factors bind to a stop codon is:

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The correct sequence of stages of viral replication is

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Treatment of a viral infection by inoculating the host with a bacterial virus

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The stage of viral replication in which the viral nucleic acid is released inside the cell is

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RNA differs from DNA in many ways,including

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A tRNA molecule is "bilingual" because it binds to

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A poly A tail is added to the mature mRNA after transcription.

Correct AnswerverifiedShow Answer

Cells have only two copies of most genes,but can make hundreds of copies of a protein from those genes per second,because

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The stage of viral replication in which the host cell produces viral nucleic acids and proteins is

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The stage of viral replication in which the virus binds to a cell surface receptor is

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Which of the following best describes the relationship between DNA,proteins,and RNA?

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In eukaryotic cells,sequences of mRNA removed before translation are called

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Viruses always lack which of the following?

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What are proteins that initiate transcription in eukaryotes by recognizing sequences within the promoter region of a gene and attracting RNA polymerase?

Correct AnswerverifiedShow Answer

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years,and when a patient becomes stressed the virus is released,forming cold sores on the lips.Why would the virus form a cold sore?

Correct AnswerverifiedShow Answer

In eukaryotes,transcription copies only one gene from one DNA strand of the chromosome.

Correct AnswerverifiedShow Answer

Viruses that infect bacteria are:

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Why would it take more energy to separate DNA with the sequence GCGCGCGC and its complementary strand than the sequence ATATATAT and its complementary strand?

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One key reason why viruses are not considered living organisms is

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