Question 1

As the two strands of DNA are unraveled,which enzyme relieves the strain on the two strands?

Accepted Answer

A)  DNA polymerase
B)  DNA ligase
C)  DNA gyrase
D)  DNA endonuclease
E)  DNA exonucleaseF) All of the above
G) C) and D)

Question 2

You decide to repeat the Meselson-Stahl experiment,except this time you plan to grow the E.coli cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication) .If the semiconservative model of DNA replication is correct,what is the expected distribution of DNA in the density gradient after two rounds of replication?

Accepted Answer

A)  One band of intermediate density.
B)  One band of intermediate density and one band of light density.
C)  One band of intermediate density and one band of heavy density.
D)  One band of heavy density and one band of light density.
E)  One band of heavy density.F) B) and E)
G) A) and E)

Question 3

What is the correct sequence for DNA replication in E.coli?

Accepted Answer

A)  initiation,termination,elongation
B)  initiation,elongation,termination
C)  elongation,termination,initiation
D)  elongation,initiation,terminationE) B) and C)
F) All of the above

Question 4

The lagging strand is replicated with a series of Okazaki fragments and that is why its synthesis is considered to be

Accepted Answer

A)  discontinuous.
B)  continuous.
C)  bidirectional.
D)  antiparallel.
E)  semiconservative.F) B) and E)
G) B) and C)

Question 5

In which cells would you expect to find the highest level of telomerase?

Accepted Answer

A)  muscle cells
B)  adipose tissue cells
C)  neurons
D)  cells that replenish the lining of the gutE) All of the above
F) B) and C)

Question 6

The site where the two original DNA strands separate and active replication occurs is called the

Accepted Answer

A)  replication fork.
B)  replisome.
C)  primosome.
D)  lagging strand.
E)  sliding clamp subunit.F) B) and D)
G) C) and D)

Question 7

Who provided X-ray diffraction photographs of purified DNA fibers that suggested a helical structure with a consistent diameter of about 2 nm and a complete helical turn every 3.4 nm?

Accepted Answer

A)  Hershey and Chase
B)  Chargaff
C)  Franklin
D)  Watson and CrickE) B) and D)
F) A) and B)

Question 8

During DNA replication,DNA pol III synthesizes the lagging strand in segments,called

Accepted Answer

A)  replication fragments.
B)  Chargaff's segments.
C)  repeating primers.
D)  replisomes.
E)  Okazaki fragments.F) All of the above
G) B) and E)

Question 9

DNA consists of two antiparallel strands of nucleotides held together by

Accepted Answer

A)  peptide bonds.
B)  covalent bonds.
C)  ionic bonds.
D)  hydrogen bonds.E) A) and B)
F) B) and D)

Question 10

Who proposed that the structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of nitrogenous bases?

Accepted Answer

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

Question 11

DNA primase

Accepted Answer

A)  creates a short RNA primer that is complementary to an RNA template.
B)  creates a short DNA primer that is complementary to an RNA template.
C)  creates a short DNA primer that is complementary to a DNA template.
D)  creates a short DNA template that is complementary to an RNA primer.
E)  creates a short RNA primer that is complementary to a DNA template.F) A) and B)
G) None of the above

Question 12

If 14% of the nucleotides from a DNA molecule contain the base T,what percent will contain the base G?

Accepted Answer

A)  14%
B)  18%
C)  28%
D)  36%
E)  72%F) A) and B)
G) All of the above

Question 13

If 16% of the nucleotides in one strand of a DNA molecule contain the base G,what percent of the nucleotides on the complementary strand will also contain the base G?

Accepted Answer

A)  16%
B)  8%
C)  34%
D)  32%
E)  It is impossible to determine from the information given.F) B) and D)
G) B) and C)

Question 14

The two strands of a DNA molecule contain nitrogen bases which are

Accepted Answer

A)  identical.
B)  parallel.
C)  complementary.
D)  proportionate.
E)  random.F) None of the above
G) C) and D)

Question 15

Chargaff's rules for the pairing of nitrogen bases is

Accepted Answer

A)  A = C and G = T.
B)  A = T and G = C.
C)  A = G and C = T.
D)  A+T = G+C.E) B) and D)
F) B) and C)

Question 16

When a mixture of live nonvirulent bacteria and dead virulent bacteria was injected into mice,Griffith unexpectedly found that the injected mice died.He explained this result by suggesting that the nonvirulent bacteria are being

Accepted Answer

A)  activated.
B)  transformed.
C)  translated.
D)  transcribed.
E)  expressed.F) A) and B)
G) A) and C)

Question 17

In Griffith's experiments,

Accepted Answer

A)  mice infected with live nonvirulent bacteria developed pneumonia and died.
B)  nonvirulent bacteria transformed the virulent bacteria into a nonvirulent variety.
C)  mice infected with heat-killed virulent bacteria and live nonvirulent bacteria developed pneumonia and died.
D)  mice infected with heat-killed virulent bacteria and heat-killed nonvirulent bacteria developed pneumonia and died.E) A) and B)
F) C) and D)

Question 18

Avery and his coworkers showed that the agent responsible for changing nonvirulent bacteria into virulent bacteria was

Accepted Answer

A)  protein.
B)  polysaccharide.
C)  DNA.
D)  RNA.
E)  lipid.F) B) and D)
G) A) and C)

Question 19

Which statement about the Hershey-Chase experiment is false?

Accepted Answer

A)  DNA was labeled with radioactive phosphorus.
B)  Protein was labeled with radioactive sulfur.
C)  The virus-infected bacteria contained radioactive phosphorus.
D)  The virus-infected bacteria contained radioactive sulfur.E) A) and C)
F) C) and D)

Question 20

During DNA replication,which enzyme removes the RNA primers and then fills in the gap?

Accepted Answer

A)  DNA pol I
B)  DNA primase
C)  DNA pol III
D)  DNA ligaseE) A) and C)
F) B) and C)

Exam 14: Dna: the Genetic Material

If 14% of the nucleotides from a DNA molecule contain the base T,what percent will contain the base G?

Correct Answer
verified

The lagging strand is replicated with a series of Okazaki fragments and that is why its synthesis is considered to be

Correct Answer
verified

Which statement about the Hershey-Chase experiment is false?

Correct Answer
verified

As the two strands of DNA are unraveled,which enzyme relieves the strain on the two strands?

Correct Answer
verified

If 16% of the nucleotides in one strand of a DNA molecule contain the base G,what percent of the nucleotides on the complementary strand will also contain the base G?

Correct Answer
verified

Who provided X-ray diffraction photographs of purified DNA fibers that suggested a helical structure with a consistent diameter of about 2 nm and a complete helical turn every 3.4 nm?

Correct Answer
verified

DNA consists of two antiparallel strands of nucleotides held together by

Correct Answer
verified

When a mixture of live nonvirulent bacteria and dead virulent bacteria was injected into mice,Griffith unexpectedly found that the injected mice died.He explained this result by suggesting that the nonvirulent bacteria are being

Correct Answer
verified

The two strands of a DNA molecule contain nitrogen bases which are

Correct Answer
verified

During DNA replication,which enzyme removes the RNA primers and then fills in the gap?

Correct Answer
verified

Who proposed that the structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of nitrogenous bases?

Correct Answer
verified

The site where the two original DNA strands separate and active replication occurs is called the

Correct Answer
verified

What is the correct sequence for DNA replication in E.coli?

Correct Answer
verified

DNA primase

Correct Answer
verified

In Griffith's experiments,

Correct Answer
verified

In which cells would you expect to find the highest level of telomerase?

Correct Answer
verified

Correct Answer
verified

During DNA replication,DNA pol III synthesizes the lagging strand in segments,called

Correct Answer
verified

Avery and his coworkers showed that the agent responsible for changing nonvirulent bacteria into virulent bacteria was

Correct Answer
verified

Chargaff's rules for the pairing of nitrogen bases is

Correct Answer
verified

Exam 14: Dna: the Genetic Material

If 14% of the nucleotides from a DNA molecule contain the base T,what percent will contain the base G?

Correct AnswerverifiedShow Answer

The lagging strand is replicated with a series of Okazaki fragments and that is why its synthesis is considered to be

Correct AnswerverifiedShow Answer

Which statement about the Hershey-Chase experiment is false?

Correct AnswerverifiedShow Answer

As the two strands of DNA are unraveled,which enzyme relieves the strain on the two strands?

Correct AnswerverifiedShow Answer

If 16% of the nucleotides in one strand of a DNA molecule contain the base G,what percent of the nucleotides on the complementary strand will also contain the base G?

Correct AnswerverifiedShow Answer

Who provided X-ray diffraction photographs of purified DNA fibers that suggested a helical structure with a consistent diameter of about 2 nm and a complete helical turn every 3.4 nm?

Correct AnswerverifiedShow Answer

DNA consists of two antiparallel strands of nucleotides held together by

Correct AnswerverifiedShow Answer

When a mixture of live nonvirulent bacteria and dead virulent bacteria was injected into mice,Griffith unexpectedly found that the injected mice died.He explained this result by suggesting that the nonvirulent bacteria are being

Correct AnswerverifiedShow Answer

The two strands of a DNA molecule contain nitrogen bases which are

Correct AnswerverifiedShow Answer

During DNA replication,which enzyme removes the RNA primers and then fills in the gap?

Correct AnswerverifiedShow Answer

Who proposed that the structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of nitrogenous bases?

Correct AnswerverifiedShow Answer

The site where the two original DNA strands separate and active replication occurs is called the

Correct AnswerverifiedShow Answer

What is the correct sequence for DNA replication in E.coli?

Correct AnswerverifiedShow Answer

DNA primase

Correct AnswerverifiedShow Answer

In Griffith's experiments,

Correct AnswerverifiedShow Answer

In which cells would you expect to find the highest level of telomerase?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

During DNA replication,DNA pol III synthesizes the lagging strand in segments,called

Correct AnswerverifiedShow Answer

Avery and his coworkers showed that the agent responsible for changing nonvirulent bacteria into virulent bacteria was

Correct AnswerverifiedShow Answer

Chargaff's rules for the pairing of nitrogen bases is

Correct AnswerverifiedShow Answer

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