Question 1

According to Watson and Crick's model, DNA consists of two strands of nucleotides that are antiparallel. What does this mean? What evidence supports the antiparallel nature of the strands?

Accepted Answer

Answers may vary. DNA consists of two st...

Question 2

In the Watson and Crick model of DNA, the "steps" of the ladder are composed of

Accepted Answer

A)   sugars.
B)   a purine and a pyrimidine.
C)   two purines.
D)   two pyrimidines.
E)   a sugar and a phosphate molecule.F) D) and E)
G) B) and C)

Question 3

Determine the number of codon sequences it would require to produce the following amino acid sequence: alanine - proline - serine - isoleucine - stop.

Accepted Answer

A)   It would take 5 codon sequences.
B)   It would take 3 codon sequences.
C)   It would take 6 codon sequences.
D)   It would take 4 codon sequences.E) B) and C)
F) A) and B)

Question 4

During the elongation of a polypeptide chain, _________ occurs when the mRNA moves to the next site on the ribosome to read the next codon.

Accepted Answer

A)   translocation
B)   transcription
C)   translation
D)   transferenceE) C) and D)
F) All of the above

Question 5

One of Chargaff's rules states that

Accepted Answer

A)   A + G = T + C.
B)   A = C, T = G.
C)   A = G, T = C.
D)   A + T = G + C.E) None of the above
F) B) and D)

Question 6

Before Watson and Crick described DNA structure, Linus Pauling proposed a possible model with three strands of support running down the middle and the bases extending out the sides. How did Pauling's model differ from Watson and Crick's?

Accepted Answer

A)   He missed the number of support strands which was two rather than three.
B)   The support strands ran along the outside rather than down the center.
C)   The bases were paired in the middle rather than sticking out the sides.
D)   All of the choices describe how Pauling's model was different than Watson and Crick's model.E) None of the above
F) A) and B)

Question 7

Scientists have created genetically modified organisms (GMOs)  by isolating and then transferring the jellyfish gene for green fluorescent protein into pigs, bacteria, plants and mice. The result was bioluminescent organisms! These experiments demonstrate that

Accepted Answer

A)   jellyfish genes may be transferred into other aquatic ectotherms, but not mammals.
B)   genes have no difficulty crossing the species barrier.
C)   animal genes will not function if transferred into animals.
D)   genes can only be transferred to other organisms within the same species.E) B) and D)
F) C) and D)

Question 8

After the DNA repair enzymes complex has completed its function, approximately how many base-pairs are still improperly matched in the bacterial genome?

Accepted Answer

A)   1 in 10,000
B)   1 in 100,000
C)   1 in 1,000,000
D)   1 in 100,000,000
E)   1 in a billionF) B) and E)
G) A) and C)

Question 9

Ribozymes are RNA molecules that function as enzymes, catalyzing reactions during RNA splicing.

Accepted Answer

A) True 
 B)False

Question 10

Growth at two replication forks arising from a single origin of replication produce a "bubble" as daughter DNA molecules form.

Accepted Answer

A) True 
 B)False

Question 11

Which statement is NOT true about DNA replication in prokaryotes?

Accepted Answer

A)   Replication begins at a single origin of replication.
B)   Replication is bidirectional from the origin(s) .
C)   Replication occurs at about 1 million base pairs per minute.
D)   Since bacterial cells replicate so rapidly, a second round of replication may begin before the first has been completed.
E)   There are many bacterial chromosomes, with replication occurring in each at the same time.F) A) and E)
G) B) and E)

Question 12

Which of the following statements is NOT true about the debate over the nature of genetic material?

Accepted Answer

A)   Many scientists believed that DNA was not the genetic material because, with only four types of nucleotides, DNA did not have enough variability to store information.
B)   Scientists focused on carbohydrate and protein in their studies of possible genetic material since they knew that genes were on chromosomes and that chromosomes were made of carbohydrate and protein.
C)   Many scientists thought that proteins had a greater capacity for storing information because proteins contain 20 amino acids that could be sequenced differently.
D)   Some scientists thought that RNA was likely to be the genetic material.E) A) and B)
F) A) and C)

Question 13

While many body cells only replicate 40 to 60 times, cells that produce certain white blood cells may replicate many more times. It is, therefore, crucial that proofreading and repair occur so that the transfer of biological information is accurate. On the other hand, absolute accuracy in replication of biological information would cancel out mutations that are the raw material of evolution. Why is accuracy in transcription and translation less critical than accuracy in gene replication?

Accepted Answer

A mutation in a gene will be passed down...

Question 14

Telomerase is an enzyme that unwinds DNA during DNA replication.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following would be transcribed into mRNA?

Accepted Answer

A)   a noncoding gene
B)   a protein-coding gene
C)   a promoter
D)   a ribozymeE) B) and D)
F) None of the above

Question 16

A (an)  _______ is a group of three bases on tRNA that is complementary to a specific mRNA codon.

Accepted Answer

A)   codon
B)   anticodon
C)   poly-A tail
D)   capE) B) and C)
F) All of the above

Question 17

Which of the following processes does NOT take place during translation?

Accepted Answer

A)   Growth of a polypeptide chain.
B)   Attachment of a ribosome to mRNA.
C)   Binding of two tRNA molecules per ribosome.
D)   Liberation of polypeptide from the ribosome.
E)   Production of mRNA.F) A) and B)
G) A) and C)

Question 18

An experiment was performed that demonstrated that DNA extracted from the S strain bacteria transformed R strain bacteria. This finding

Accepted Answer

A)    supports Hypothesis I. 
B)    supports Hypothesis II. 
C)    supports Hypothesis III. 
D)    rejects Hypothesis I only. 
E)    rejects Hypothesis II only. F)   rejects Hypothesis III only. G)   does not support any of these hypotheses. H) B) and C)
I) D) and E)

Question 19

Transformation of bacteria was shown to occur when _______ bacteria were injected into mice and the mice _______.

Accepted Answer

A)   live S strain; died
B)   live R strain; didn't die
C)   live S and R strain; died
D)   live R strain and dead S strain; died
E)   live S strain and dead R strain; didn't dieF) A) and C)
G) C) and E)

Question 20

Which of the following statements applies to the semiconservative nature of DNA replication?

Accepted Answer

A)   The old strands serve as a template for the new strand.
B)   The old strand is pulled apart and reformed into the new strand.
C)   The new strand serves as a template for the old strand.
D)   None of these statements apply to the semiconservative nature of DNA replication.E) A) and D)
F) None of the above

Exam 12: Molecular Biology of the Gene

Which statement is NOT true about DNA replication in prokaryotes?

Correct Answer
verified

Ribozymes are RNA molecules that function as enzymes, catalyzing reactions during RNA splicing.

Correct Answer
verified

Which of the following processes does NOT take place during translation?

Correct Answer
verified

Transformation of bacteria was shown to occur when _ bacteria were injected into mice and the mice _.

Correct Answer
verified

Which of the following would be transcribed into mRNA?

Correct Answer
verified

Which of the following statements is NOT true about the debate over the nature of genetic material?

Correct Answer
verified

After the DNA repair enzymes complex has completed its function, approximately how many base-pairs are still improperly matched in the bacterial genome?

Correct Answer
verified

Determine the number of codon sequences it would require to produce the following amino acid sequence: alanine - proline - serine - isoleucine - stop.

Correct Answer
verified

One of Chargaff's rules states that

Correct Answer
verified

Correct Answer
verified
A mutation in a gene will be passed down...
View Answer

During the elongation of a polypeptide chain, _________ occurs when the mRNA moves to the next site on the ribosome to read the next codon.

Correct Answer
verified

Scientists have created genetically modified organisms (GMOs) by isolating and then transferring the jellyfish gene for green fluorescent protein into pigs, bacteria, plants and mice. The result was bioluminescent organisms! These experiments demonstrate that

Correct Answer
verified

Before Watson and Crick described DNA structure, Linus Pauling proposed a possible model with three strands of support running down the middle and the bases extending out the sides. How did Pauling's model differ from Watson and Crick's?

Correct Answer
verified

Telomerase is an enzyme that unwinds DNA during DNA replication.

Correct Answer
verified

An experiment was performed that demonstrated that DNA extracted from the S strain bacteria transformed R strain bacteria. This finding

Correct Answer
verified

In the Watson and Crick model of DNA, the "steps" of the ladder are composed of

Correct Answer
verified

Growth at two replication forks arising from a single origin of replication produce a "bubble" as daughter DNA molecules form.

Correct Answer
verified

A (an) _______ is a group of three bases on tRNA that is complementary to a specific mRNA codon.

Correct Answer
verified

Which of the following statements applies to the semiconservative nature of DNA replication?

Correct Answer
verified

According to Watson and Crick's model, DNA consists of two strands of nucleotides that are antiparallel. What does this mean? What evidence supports the antiparallel nature of the strands?

Correct Answer
verified
Answers may vary. DNA consists of two st...
View Answer

Exam 12: Molecular Biology of the Gene

Which statement is NOT true about DNA replication in prokaryotes?

Correct AnswerverifiedShow Answer

Ribozymes are RNA molecules that function as enzymes, catalyzing reactions during RNA splicing.

Correct AnswerverifiedShow Answer

Which of the following processes does NOT take place during translation?

Correct AnswerverifiedShow Answer

Transformation of bacteria was shown to occur when _______ bacteria were injected into mice and the mice _______.

Correct AnswerverifiedShow Answer

Which of the following would be transcribed into mRNA?

Correct AnswerverifiedShow Answer

Which of the following statements is NOT true about the debate over the nature of genetic material?

Correct AnswerverifiedShow Answer

After the DNA repair enzymes complex has completed its function, approximately how many base-pairs are still improperly matched in the bacterial genome?

Correct AnswerverifiedShow Answer

Determine the number of codon sequences it would require to produce the following amino acid sequence: alanine - proline - serine - isoleucine - stop.

Correct AnswerverifiedShow Answer

One of Chargaff's rules states that

Correct AnswerverifiedShow Answer

Correct AnswerverifiedA mutation in a gene will be passed down...View AnswerShow Answer

During the elongation of a polypeptide chain, _________ occurs when the mRNA moves to the next site on the ribosome to read the next codon.

Correct AnswerverifiedShow Answer

Scientists have created genetically modified organisms (GMOs) by isolating and then transferring the jellyfish gene for green fluorescent protein into pigs, bacteria, plants and mice. The result was bioluminescent organisms! These experiments demonstrate that

Correct AnswerverifiedShow Answer

Before Watson and Crick described DNA structure, Linus Pauling proposed a possible model with three strands of support running down the middle and the bases extending out the sides. How did Pauling's model differ from Watson and Crick's?

Correct AnswerverifiedShow Answer

Telomerase is an enzyme that unwinds DNA during DNA replication.

Correct AnswerverifiedShow Answer

An experiment was performed that demonstrated that DNA extracted from the S strain bacteria transformed R strain bacteria. This finding

Correct AnswerverifiedShow Answer

In the Watson and Crick model of DNA, the "steps" of the ladder are composed of

Correct AnswerverifiedShow Answer

Growth at two replication forks arising from a single origin of replication produce a "bubble" as daughter DNA molecules form.

Correct AnswerverifiedShow Answer

A (an) _______ is a group of three bases on tRNA that is complementary to a specific mRNA codon.

Correct AnswerverifiedShow Answer

Which of the following statements applies to the semiconservative nature of DNA replication?

Correct AnswerverifiedShow Answer

According to Watson and Crick's model, DNA consists of two strands of nucleotides that are antiparallel. What does this mean? What evidence supports the antiparallel nature of the strands?

Correct AnswerverifiedAnswers may vary. DNA consists of two st...View AnswerShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Transformation of bacteria was shown to occur when _ bacteria were injected into mice and the mice _.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A mutation in a gene will be passed down...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Answers may vary. DNA consists of two st...
View Answer