Question 1

Genetic analysis indicates that an unknown organism contains a gene that codes for a defective form of telomerase.Based on this information alone,you can conclude that this organism

Accepted Answer

A)  is prokaryotic.
B)  is eukaryotic.
C)  has unusually long telomeres.
D)  has an increased risk of developing cancer.E) C) and D)
F) B) and D)

Question 2

Which enzyme adds new nucleotides to the end of a growing strand?

Accepted Answer

A)  ligase
B)  polymerase
C)  gyrase
D)  helicase
E)  endonucleaseF) A) and B)
G) A) and C)

Question 3

Which of the following statements about DNA replication is false?

Accepted Answer

A)  The two strands are separated.
B)  Each existing strand is used as a template for making a new strand.
C)  Synthesis of both new strands is in the 5' to 3' direction.
D)  The newly synthesized DNA is packaged into one nucleus,and the original DNA is packaged into another nucleus.E) A) and B)
F) A) and C)

Question 4

Suppose a new species of bacterium is discovered.It contains a form of DNA pol III that can add new nucleotides to either the 5' end or the 3' end of an existing strand.All other properties of the enzyme remain unchanged.How would DNA replication in these bacteria differ from normal replication?

Accepted Answer

A)  Both new strands could be synthesized continuously like the leading strand.
B)  The same polymerase molecule could synthesize both strands at the same time.
C)  Helicase would no longer be required for replication.
D)  DNA gyrase would no longer be required for replication.E) C) and D)
F) A) and D)

Question 5

Avery,MacLeod,and McCarty's experiments revealed that the transforming principle had all of the following properties except

Accepted Answer

A)  its activity was destroyed by treatment with proteases.
B)  its activity was unaffected by RNA-digesting enzymes.
C)  its activity was unaffected by lipid extraction.
D)  its activity was destroyed by treatment with DNA endonucleases.E) B) and C)
F) None of the above

Question 6

After attaching to a bacterial cell,a bacteriophage typically

Accepted Answer

A)  injects protein into the cell.
B)  extracts protein from the cell.
C)  injects DNA into the cell.
D)  extracts DNA from the cell.
E)  transforms the cell into a virulent strain.F) B) and D)
G) C) and D)

Question 7

The chemical bond connecting one nucleotide with the next along one strand of a DNA molecule is called a

Accepted Answer

A)  glycosidic bond.
B)  hydrogen bond.
C)  phosphate bond.
D)  phosphodiester bond.
E)  peptide bond.F) A) and E)
G) All of the above

Question 8

The synthesis of a growing strand of DNA is carried out by adding nucleotides to the ________ end of an existing strand.

Accepted Answer

A)  2'
B)  3'
C)  5'
D)  1'E) None of the above
F) A) and C)

Question 9

Who originally discovered the process of bacterial transformation?

Accepted Answer

A)  Watson and Crick
B)  Chargaff
C)  Hershey and Chase
D)  Griffith
E)  Meselson and StahlF) B) and E)
G) B) and D)

Question 10

The double helix model of DNA structure was proposed by

Accepted Answer

A)  Watson and Crick.
B)  Griffith.
C)  Avery.
D)  Franklin.
E)  Chargaff.F) B) and D)
G) All of the above

Question 11

Who demonstrated that phage genetic material is DNA and not protein?

Accepted Answer

A)  Hershey and Chase
B)  Chargaff
C)  Franklin
D)  Watson and Crick
E)  Avery,MacLeod,and McCartyF) B) and E)
G) A) and E)

Question 12

Which is not a component of nucleic acids?

Accepted Answer

A)  organic nitrogenous base
B)  pentose sugar
C)  phosphate
D)  sulfurE) A) and B)
F) A) and C)

Question 13

Why does DNA pol I carry the number one?

Accepted Answer

A)  It was the first polymerase isolated from E.coli.
B)  It is the first polymerase to be activated during DNA replication.
C)  It is the only polymerase that has both 3' to 5' and 5' to 3' exonuclease activity.
D)  It is the smallest polymerase.E) B) and D)
F) C) and D)

Question 14

You take a sample of bacteria with DNA that contains only 14N and allow them to replicate in a medium that contains only 15N.After 3 rounds of replication,what percent of the DNA molecules will contain one strand with only 14N and one strand with only 15N? Enter your answer as a whole number without the percent sign.For example,5% would be entered as 5 and 37% would be entered as 37.

Accepted Answer

Question 15

DNA replication always proceeds by adding new bases to the ________ end of an existing strand.

Accepted Answer

A)  1'
B)  2'
C)  3'
D)  4'
E)  5'F) All of the above
G) B) and E)

Question 16

Replication of DNA is

Accepted Answer

A)  conservative.
B)  redundant.
C)  dispersive.
D)  semiconservative.
E)  semidispersive.F) A) and B)
G) B) and E)

Question 17

An organism has been found to contain a defective form of photolyase.What function might be impaired in this organism?

Accepted Answer

A)  Lengthening of the tips of chromosomes
B)  Repair of DNA damage caused by UV light
C)  Stabilization of single-stranded DNA during DNA replication
D)  Recognition of damaged DNA by the UvrABC complexE) B) and C)
F) All of the above

Question 18

During DNA replication,each new strand begins with a short

Accepted Answer

A)  amino acid primer.
B)  lipid primer.
C)  hydrophilic primer.
D)  DNA primer.
E)  RNA primer.F) A) and B)
G) None of the above

Question 19

Nucleotides have a phosphate group attached at the ________ carbon atom of the sugar.

Accepted Answer

A)  2'
B)  3'
C)  5'
D)  1'E) All of the above
F) None of the above

Question 20

If we think of the DNA double helix as a twisted ladder,what makes up the rungs or steps of the ladder?

Accepted Answer

A)  phosphate groups only
B)  alternating phosphate groups and sugars
C)  sugars only
D)  purines and pyrimidines
E)  phosphate groups and basesF) B) and D)
G) C) and E)

Exam 14: Dna: the Genetic Material

Correct Answer
verified

Avery,MacLeod,and McCarty's experiments revealed that the transforming principle had all of the following properties except

Correct Answer
verified

Genetic analysis indicates that an unknown organism contains a gene that codes for a defective form of telomerase.Based on this information alone,you can conclude that this organism

Correct Answer
verified

The chemical bond connecting one nucleotide with the next along one strand of a DNA molecule is called a

Correct Answer
verified

An organism has been found to contain a defective form of photolyase.What function might be impaired in this organism?

Correct Answer
verified

DNA replication always proceeds by adding new bases to the ________ end of an existing strand.

Correct Answer
verified

Which of the following statements about DNA replication is false?

Correct Answer
verified

Which is not a component of nucleic acids?

Correct Answer
verified

Why does DNA pol I carry the number one?

Correct Answer
verified

During DNA replication,each new strand begins with a short

Correct Answer
verified

If we think of the DNA double helix as a twisted ladder,what makes up the rungs or steps of the ladder?

Correct Answer
verified

Who originally discovered the process of bacterial transformation?

Correct Answer
verified

Nucleotides have a phosphate group attached at the ________ carbon atom of the sugar.

Correct Answer
verified

Replication of DNA is

Correct Answer
verified

Suppose a new species of bacterium is discovered.It contains a form of DNA pol III that can add new nucleotides to either the 5' end or the 3' end of an existing strand.All other properties of the enzyme remain unchanged.How would DNA replication in these bacteria differ from normal replication?

Correct Answer
verified

Which enzyme adds new nucleotides to the end of a growing strand?

Correct Answer
verified

The double helix model of DNA structure was proposed by

Correct Answer
verified

After attaching to a bacterial cell,a bacteriophage typically

Correct Answer
verified

The synthesis of a growing strand of DNA is carried out by adding nucleotides to the ________ end of an existing strand.

Correct Answer
verified

Who demonstrated that phage genetic material is DNA and not protein?

Correct Answer
verified

Exam 14: Dna: the Genetic Material

Correct AnswerverifiedShow Answer

Avery,MacLeod,and McCarty's experiments revealed that the transforming principle had all of the following properties except

Correct AnswerverifiedShow Answer

Genetic analysis indicates that an unknown organism contains a gene that codes for a defective form of telomerase.Based on this information alone,you can conclude that this organism

Correct AnswerverifiedShow Answer

The chemical bond connecting one nucleotide with the next along one strand of a DNA molecule is called a

Correct AnswerverifiedShow Answer

An organism has been found to contain a defective form of photolyase.What function might be impaired in this organism?

Correct AnswerverifiedShow Answer

DNA replication always proceeds by adding new bases to the ________ end of an existing strand.

Correct AnswerverifiedShow Answer

Which of the following statements about DNA replication is false?

Correct AnswerverifiedShow Answer

Which is not a component of nucleic acids?

Correct AnswerverifiedShow Answer

Why does DNA pol I carry the number one?

Correct AnswerverifiedShow Answer

During DNA replication,each new strand begins with a short

Correct AnswerverifiedShow Answer

If we think of the DNA double helix as a twisted ladder,what makes up the rungs or steps of the ladder?

Correct AnswerverifiedShow Answer

Who originally discovered the process of bacterial transformation?

Correct AnswerverifiedShow Answer

Nucleotides have a phosphate group attached at the ________ carbon atom of the sugar.

Correct AnswerverifiedShow Answer

Replication of DNA is

Correct AnswerverifiedShow Answer

Suppose a new species of bacterium is discovered.It contains a form of DNA pol III that can add new nucleotides to either the 5' end or the 3' end of an existing strand.All other properties of the enzyme remain unchanged.How would DNA replication in these bacteria differ from normal replication?

Correct AnswerverifiedShow Answer

Which enzyme adds new nucleotides to the end of a growing strand?

Correct AnswerverifiedShow Answer

The double helix model of DNA structure was proposed by

Correct AnswerverifiedShow Answer

After attaching to a bacterial cell,a bacteriophage typically

Correct AnswerverifiedShow Answer

The synthesis of a growing strand of DNA is carried out by adding nucleotides to the ________ end of an existing strand.

Correct AnswerverifiedShow Answer

Who demonstrated that phage genetic material is DNA and not protein?

Correct AnswerverifiedShow Answer

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