Question 1

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 billion 
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 billion D

Question 2

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

Question 3

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. 
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. A

Question 4

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 billion 
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 billion

Question 5

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. 
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.

Question 6

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

Accepted Answer

A) 13% 
B) 37% 
C) 26% 
D) 74% 
A) 13% 
B) 37% 
C) 26% 
D) 74%

Question 7

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 ribozyme 
A) a noncoding gene 
B) a protein-coding gene 
C) a promoter 
D) a ribozyme

Question 8

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

Accepted Answer

A) proteinase 
B) RNAase 
C) DNAase 
D) lipase 
A) proteinase 
B) RNAase 
C) DNAase 
D) lipase

Question 9

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

Question 10

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 synthase 
A) helicase 
B) DNA polymerase 
C) DNA ligase 
D) ATP synthase

Question 11

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

Question 12

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 13

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. 
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.

Question 14

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) transference 
A) translocation 
B) transcription 
C) translation 
D) transference

Question 15

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. 
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.

Question 16

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. 
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.

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. 
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.

Question 18

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

Question 19

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. 
A) tRNA. 
B) mRNA. 
C) DNA. 
D) rRNA.

Question 20

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

Exam 12: Molecular Biology of the Gene

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

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

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

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

Which of the following statements concerning ribosomes are true?

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

Which of the following would be transcribed into mRNA?

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

Nucleotides contain all of the following except:

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.

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

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.

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?

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

DNA replication is considered semiconservative because:

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

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

The correct sequence of events in translation is:

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

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

A View of Life

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