Question 1

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) C) and D)
F) A) and D) A

Question 2

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) None of the above
F) A) and B)

Question 3

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) B) and C)
G) A) and B)

Question 4

The correct sequence of events in translation is:

Accepted Answer

A)  initiation,termination,elongation.
B)  elongation,termination,initiation.
C)  termination,elongation,initiation.
D)  elongation,initiation,termination.
E)  initiation,elongation,termination.F) All of the above
G) D) and E)

Question 5

For translation to take place,which of the following would NOT be required to be present?

Accepted Answer

A)  DNA.
B)  mRNA.
C)  tRNA-amino acid complex.
D)  rRNA.
E)  ribosome.F) A) and D)
G) C) and D)

Question 6

An unknown chemical is analyzed and found to contain the bases thymine and guanine.This chemical is most likely

Accepted Answer

A)  tRNA.
B)  mRNA.
C)  DNA.
D)  rRNA.E) A) and D)
F) All of the above

Question 7

Nucleotides contain all of the following except:

Accepted Answer

A)  a phosphate group
B)  a 5 - carbon sugar
C)  a nitrogen base
D)  histones
E)  a phosphate and a nitrogen baseF) B) and D)
G) B) and E)

Question 8

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) B) and C)
F) A) and D)

Question 9

Which of the following statements concerning ribosomes are true?

Accepted Answer

A)  Several ribosomes are often attached to and translating the same mRNA.
B)  Ribosomes join amino acids to form a polypeptide.
C)  Ribosomes have a binding site for mRNA and three binding sites for tRNA molecules.
D)  No protein synthesis within a cell would occur without ribosomes.
E)  All of the above statements are true.F) B) and D)
G) A) and B)

Question 10

During the replication of DNA,DNA polymerase has to synthesize the daughter strand in the 5' to 3' direction because DNA polymerase can only join nucleotides to the 3' end of the growing new strand.

Accepted Answer

A) True 
 B)False

Question 11

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

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) C) and E)
G) C) and D) D

Question 12

The first codon to be deciphered was ______,which codes for ________.

Accepted Answer

A)  AAA,proline
B)  GGG,alanine
C)  UUU,phenylalanine
D)  TTT,arginine
E)  CCC,glycineF) C) and D)
G) B) and D) C

Question 13

DNA replication is considered semiconservative because:

Accepted Answer

A)  it will create three new,identical strands when finished.
B)  it uses the original strand as a template for replication.
C)  it always replicates in the 3 to 5 prime direction.
D)  it never replicates in the 5 to 3 prime direction.E) A) and B)
F) A) and C)

Question 14

Before the DNA repair enzyme complex has completed its function,approximately how many base-pairs are still improperly matched?

Accepted Answer

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

Question 15

If a DNA sample contains 13% adenine,what percentage of the sample contains cytosine?

Accepted Answer

A)  13%
B)  37%
C)  26%
D)  74%E) A) and C)
F) A) and D)

Question 16

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) B) and C)

Question 17

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 18

During DNA replication,the enzyme ___________,catalyzes the elongation of new DNA by adding,to the 3' end of the previous nucleotide,new nucleotides that are complementary to a DNA template.

Accepted Answer

A)  helicase
B)  DNA polymerase
C)  DNA ligase
D)  ATP synthaseE) B) and D)
F) B) and C)

Question 19

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) B) and E)

Question 20

DNA was shown to be the transforming substance when only the ______ enzymes could inhibit transformation.

Accepted Answer

A)  proteinase
B)  RNAase
C)  DNAase
D)  lipaseE) C) and D)
F) B) and C)

Exam 12: Molecular Biology of the Gene

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

Correct AnswerverifiedA

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

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

Correct AnswerverifiedShow Answer

The correct sequence of events in translation is:

Correct AnswerverifiedShow Answer

For translation to take place,which of the following would NOT be required to be present?

Correct AnswerverifiedShow Answer

An unknown chemical is analyzed and found to contain the bases thymine and guanine.This chemical is most likely

Correct AnswerverifiedShow Answer

Nucleotides contain all of the following except:

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

Which of the following statements concerning ribosomes are true?

Correct AnswerverifiedShow Answer

During the replication of DNA,DNA polymerase has to synthesize the daughter strand in the 5' to 3' direction because DNA polymerase can only join nucleotides to the 3' end of the growing new strand.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

The first codon to be deciphered was ______,which codes for ________.

Correct AnswerverifiedC

DNA replication is considered semiconservative because:

Correct AnswerverifiedShow Answer

Before the DNA repair enzyme complex has completed its function,approximately how many base-pairs are still improperly matched?

Correct AnswerverifiedShow Answer

If a DNA sample contains 13% adenine,what percentage of the sample contains cytosine?

Correct AnswerverifiedShow Answer

Which of the following would be transcribed into mRNA?

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

During DNA replication,the enzyme ___________,catalyzes the elongation of new DNA by adding,to the 3' end of the previous nucleotide,new nucleotides that are complementary to a DNA template.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

DNA was shown to be the transforming substance when only the ______ enzymes could inhibit transformation.

Correct AnswerverifiedShow Answer

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D

The first codon to be deciphered was ,which codes for __.

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C

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