Question 1

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

Question 2

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. 
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.

Question 3

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. 
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.

Question 4

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

Question 5

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. 
A) peptide bonds. 
B) covalent bonds. 
C) ionic bonds. 
D) hydrogen bonds.

Question 6

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

Question 7

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

Accepted Answer

A) identical. 
B) parallel. 
C) complementary. 
D) proportionate. 
E) random. 
A) identical. 
B) parallel. 
C) complementary. 
D) proportionate. 
E) random.

Question 8

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. 
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.

Question 9

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 exonuclease 
A) DNA polymerase 
B) DNA ligase 
C) DNA gyrase 
D) DNA endonuclease 
E) DNA exonuclease

Question 10

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% 
A) 14% 
B) 18% 
C) 28% 
D) 36% 
E) 72%

Question 11

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

Question 12

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 gut 
A) muscle cells 
B) adipose tissue cells 
C) neurons 
D) cells that replenish the lining of the gut

Question 13

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

Question 14

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 ligase 
A) DNA pol I 
B) DNA primase 
C) DNA pol III 
D) DNA ligase

Question 15

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,termination 
A) initiation,termination,elongation 
B) initiation,elongation,termination 
C) elongation,termination,initiation 
D) elongation,initiation,termination

Question 16

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 Crick 
A) Hershey and Chase 
B) Chargaff 
C) Franklin 
D) Watson and Crick

Question 17

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. 
A) replication fragments. 
B) Chargaff's segments. 
C) repeating primers. 
D) replisomes. 
E) Okazaki fragments.

Question 18

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

Question 19

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. 
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.

Question 20

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

Exam 14: Dna: the Genetic Material

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

DNA primase

Which statement about the Hershey-Chase experiment is false?

Chargaff's rules for the pairing of nitrogen bases is

DNA consists of two antiparallel strands of nucleotides held together by

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?

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

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

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

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

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

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

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

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

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?

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

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

In Griffith's experiments,

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?

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