Question 1

A change in a cell's DNA sequence is

Accepted Answer

A)  replication.
B)  transcription.
C)  a mutation.
D)  translation.
E)  an operon.F) B) and E)
G) C) and D)

Question 2

DNA differs from RNA because,unlike RNA,

Accepted Answer

A)  DNA contains uracil.
B)  DNA contains thymine.
C)  DNA can catalyze some chemical reactions.
D)  DNA is single strandeD.
E)  DNA contains ribosE.F) B) and C)
G) A) and C)

Question 3

The step of translation in which an mRNA,a small ribosomal subunit,and the initiator tRNA are aligned together is

Accepted Answer

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

Question 4

A group of genes,a promoter,and an operator that control transcription are called a(n)

Accepted Answer

A)  translational unit.
B)  chromosome.
C)  ribosome.
D)  envelope.
E)  operon.F) C) and E)
G) B) and E)

Question 5

If the DNA in a cell consists of 20% adenine,then it will also contain ___ guanine.

Accepted Answer

A)  20%
B)  80%
C)  30%
D)  40%
E)  10%F) A) and B)
G) A) and C)

Question 6

If

Accepted Answer

A)  the repressor will bind the operator,thus allowing transcription of the lac operon genes.
B)  the repressor will NOT bind the operator,thus preventing transcription of the lac operon genes.
C)  the repressor will NOT bind the operator,thus allowing transcription of the lac operon genes.
D)  the repressor will bind the operator,thus preventing transcription of the lac operon genes.
E)  coli bacterium are grown in the presence of lactoseF) B) and C)
G) A) and B)

Question 7

HIV

Accepted Answer

A)  is a retrovirus.
B)  infects most mammals.
C)  can be killed with antibiotics.
D)  causes liver cancer.
E)  can be transmitted through the skin.F) B) and C)
G) C) and D)

Question 8

In DNA molecules,

Accepted Answer

A)  cytosine pairs with adenine.
B)  thymine pairs with uracil.
C)  adenine pairs with uracil.
D)  adenine pairs with thymine.
E)  cytosine pairs with thyminE.F) None of the above
G) A) and E)

Question 9

Mutations cause incorrect sequencing of nucleic acids.Incorrect sequencing of DNA will result in new alleles,and it may lead to evolution.Incorrect sequencing of mRNA will result in a faulty protein,but it will not lead to evolution.

Accepted Answer

A) True 
 B)False

Question 10

What process converts the mRNA "message" into a sequence of amino acids?

Accepted Answer

A)  transcription
B)  replication
C)  mitosis
D)  amino acid synthesis
E)  translationF) A) and B)
G) A) and C)

Question 11

The stage of viral replication in which viral components are put together to form new viruses is

Accepted Answer

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

Question 12

Mutations create new alleles that

Accepted Answer

A)  are beneficial to the organism's fitness.
B)  have no effect on the fitness of the organism.
C)  decrease the fitness of the organism.
D)  All of the choices are correct.E) None of the above
F) A) and B)

Question 13

A layer of membrane attached to a virus is called

Accepted Answer

A)  an envelope.
B)  a protein coat.
C)  a chromosome.
D)  a plasmiD.
E)  a nucleus.F) B) and C)
G) B) and D)

Question 14

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.In a cold sore,the virus is in which of the following states?

Accepted Answer

A)  latent
B)  lytic
C)  assembly
D)  remissive
E)  asymptomaticF) A) and B)
G) B) and C)

Question 15

The rungs of the DNA ladder are formed by base pairs

Accepted Answer

A)  joined by covalent bonds.
B)  joined by hydrogen bonds.
C)  joined by ionic bonds.
D)  NOT joined to each other.E) B) and C)
F) A) and D)

Question 16

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.Where is the virus located while dormant in the nerve cell?

Accepted Answer

A)  floating in the nerve cell cytoplasm
B)  integrated in the nerve cell chromosomes
C)  in the nerve cell membrane
D)  floating outside of the nerve cell,waiting to reinfect itE) A) and D)
F) A) and B)

Question 17

In the bacterium
E.coli,a repressor protein binds to the operator region of the DNA in the absence of lactose,thus preventing the transcription of the genes of the lactose operon.

Accepted Answer

A) True 
 B)False

Question 18

Our most potent weapon in the fight against viruses is

Accepted Answer

A)  antibiotics.
B)  sulfa drugs.
C)  gene therapy.
D)  surgery.
E)  vaccinations.F) B) and D)
G) B) and E)

Question 19

What type of RNA carries amino acids to the ribosome?

Accepted Answer

A)  complementary RNA
B)  messenger RNA
C)  ribosomal RNA
D)  double-stranded RNA
E)  transfer RNAF) A) and E)
G) A) and D)

Question 20

Which DNA mutation leads to the change of a single amino acid in a protein?

Accepted Answer

A)  deletion
B)  insertion
C)  substitution
D)  frameshiftE) A) and B)
F) A) and C)

Exam 7: DNA Structure and Gene Function

The step of translation in which an mRNA,a small ribosomal subunit,and the initiator tRNA are aligned together is

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Which DNA mutation leads to the change of a single amino acid in a protein?

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If the DNA in a cell consists of 20% adenine,then it will also contain ___ guanine.

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The stage of viral replication in which viral components are put together to form new viruses is

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A change in a cell's DNA sequence is

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In DNA molecules,

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If

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Our most potent weapon in the fight against viruses is

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DNA differs from RNA because,unlike RNA,

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The rungs of the DNA ladder are formed by base pairs

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Mutations cause incorrect sequencing of nucleic acids.Incorrect sequencing of DNA will result in new alleles,and it may lead to evolution.Incorrect sequencing of mRNA will result in a faulty protein,but it will not lead to evolution.

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A layer of membrane attached to a virus is called

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What type of RNA carries amino acids to the ribosome?

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Mutations create new alleles that

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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.Where is the virus located while dormant in the nerve cell?

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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.In a cold sore,the virus is in which of the following states?

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In the bacterium E.coli,a repressor protein binds to the operator region of the DNA in the absence of lactose,thus preventing the transcription of the genes of the lactose operon.

Correct AnswerverifiedShow Answer

What process converts the mRNA "message" into a sequence of amino acids?

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HIV

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A group of genes,a promoter,and an operator that control transcription are called a(n)

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