Question 1

Which of the following is NOT associated with a higher cancer risk?

Accepted Answer

A)   hormone therapy
B)   safe sex
C)   smoking
D)   use of alcohol
E)   exposure to certain hazardous chemicals in the workplaceF) A) and D)
G) B) and D)

Question 2

In the Watson-Crick model of DNA,the "sides" of the ladder are composed of

Accepted Answer

A)   sugars.
B)   bases.
C)   hydrogen bonds.
D)   sugar-phosphate molecules.
E)   phosphate groups.F) A) and E)
G) A) and D)

Question 3

Which is most directly responsible for the sequence of amino acids in a protein?

Accepted Answer

A)   the sequence of the anticodons
B)   the number of codons in mRNA
C)   the enzyme that attaches the amino acid to tRNA
D)   the proteins associated with rRNA
E)   the sequence of codons in mRNAF) A) and C)
G) A) and D)

Question 4

Which level of primary control in eukaryotic gene activity involves changes in the polypeptide chain before it becomes functional?

Accepted Answer

A)   feedback control
B)   translational control
C)   transcriptional control
D)   posttranscriptional control
E)   posttranslational controlF) B) and D)
G) B) and C)

Question 5

Which of the following is NOT a frameshift mutation of the nucleotide sequence CATUAUCCC?

Accepted Answer

A)   CATTUAUCCC
B)   ATUAUCCC
C)   CTUAUCCC
D)   CATUAUCGC
E)   CCATUAUCCCF) A) and D)
G) A) and E)

Question 6

When the sheep Dolly was successfully cloned,it was produced by growing an in vitro fertilized egg where the normal egg nucleus had been removed and replaced by a nucleus from an adult.Since this nucleus is from an old mature animal,we would expect it to ______.Interestingly,tests show that this did not happen,a fact that currently puzzles researchers.

Accepted Answer

A)   have additional Barr bodies
B)   be mutated
C)   have shorter telomeres
D)   have longer telomeres
E)   express transcription and translation more rapidlyF) A) and C)
G) C) and E)

Question 7

The ______ contain(s) the information for the structure of the protein.

Accepted Answer

A)   introns
B)   exons
C)   promoter
D)   ribosomes
E)   nucleoliF) A) and C)
G) A) and B)

Question 8

The fact that for a given species the amount of purines in the DNA always matches the number of pyrimidines was first determined by

Accepted Answer

A)   Watson and Crick.
B)   Franklin and Wilkins.
C)   Hershey and Chase.
D)   Chargaff.
E)   Mendel.F) B) and E)
G) C) and D)

Question 9

Of the following types of RNA,which is one of the determining factors in cell differentiation?

Accepted Answer

A)   tRNA
B)   rRNA
C)   mRNA
D)   No type of RNA is a determing factor in cell differentiation.
E)   cRNAF) A) and E)
G) A) and B)

Question 10

-In Figure 25.4,when replication is finished,strand 1 will have the same base composition as strand ___ while strand 2 will have the same base composition as strand ____.

Accepted Answer

A)   2; 3
B)   1; 3
C)   3; 4
D)   1; 4
E)   2; 4F) B) and D)
G) B) and C)

Question 11

Hershey and Chase experimented with radioactively labeled phosphorus and sulfur to determine that DNA and not protein is the genetic material.Which of the following would NOT be an essential part of this experiment?

Accepted Answer

A)   Sulfur is present in amino acids in the protein coat of bacteria.
B)   Phosphorus is present in high amounts in DNA.
C)   Sulfur is not present in DNA.
D)   Phosphorus is not present in amino acids in the protein coat of bacteria.
E)   DNA contains nitrogen.F) B) and D)
G) A) and D)

Question 12

Indicate the complimentary nucleotide sequence for the following section of DNA: AATGCGTATACG

Accepted Answer

DNA forms a complimentary sequence which...

Question 13

Initiation,elongation,and termination are three stages in

Accepted Answer

A)   DNA replication.
B)   error correction by proofreading enzymes.
C)   mRNA processing.
D)   translation.
E)   intron removal.F) None of the above
G) All of the above

Exam 25: DNA Structure and Gene Expression

Which of the following is NOT a frameshift mutation of the nucleotide sequence CATUAUCCC?

Correct Answer
verified

In the Watson-Crick model of DNA,the "sides" of the ladder are composed of

Correct Answer
verified

Indicate the complimentary nucleotide sequence for the following section of DNA: AATGCGTATACG

Correct Answer
verified
DNA forms a complimentary sequence which...
View Answer

Which level of primary control in eukaryotic gene activity involves changes in the polypeptide chain before it becomes functional?

Correct Answer
verified

The ______ contain(s) the information for the structure of the protein.

Correct Answer
verified

The fact that for a given species the amount of purines in the DNA always matches the number of pyrimidines was first determined by

Correct Answer
verified

Of the following types of RNA,which is one of the determining factors in cell differentiation?

Correct Answer
verified

Which of the following is NOT associated with a higher cancer risk?

Correct Answer
verified

Initiation,elongation,and termination are three stages in

Correct Answer
verified

Hershey and Chase experimented with radioactively labeled phosphorus and sulfur to determine that DNA and not protein is the genetic material.Which of the following would NOT be an essential part of this experiment?

Correct Answer
verified

Correct Answer
verified

Which is most directly responsible for the sequence of amino acids in a protein?

Correct Answer
verified

-In Figure 25.4,when replication is finished,strand 1 will have the same base composition as strand _ while strand 2 will have the same base composition as strand __.

Correct Answer
verified

Exam 25: DNA Structure and Gene Expression

Which of the following is NOT a frameshift mutation of the nucleotide sequence CATUAUCCC?

Correct AnswerverifiedShow Answer

In the Watson-Crick model of DNA,the "sides" of the ladder are composed of

Correct AnswerverifiedShow Answer

Indicate the complimentary nucleotide sequence for the following section of DNA: AATGCGTATACG

Correct AnswerverifiedDNA forms a complimentary sequence which...View AnswerShow Answer

Which level of primary control in eukaryotic gene activity involves changes in the polypeptide chain before it becomes functional?

Correct AnswerverifiedShow Answer

The ______ contain(s) the information for the structure of the protein.

Correct AnswerverifiedShow Answer

The fact that for a given species the amount of purines in the DNA always matches the number of pyrimidines was first determined by

Correct AnswerverifiedShow Answer

Of the following types of RNA,which is one of the determining factors in cell differentiation?

Correct AnswerverifiedShow Answer

Which of the following is NOT associated with a higher cancer risk?

Correct AnswerverifiedShow Answer

Initiation,elongation,and termination are three stages in

Correct AnswerverifiedShow Answer

Hershey and Chase experimented with radioactively labeled phosphorus and sulfur to determine that DNA and not protein is the genetic material.Which of the following would NOT be an essential part of this experiment?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which is most directly responsible for the sequence of amino acids in a protein?

Correct AnswerverifiedShow Answer

-In Figure 25.4,when replication is finished,strand 1 will have the same base composition as strand ___ while strand 2 will have the same base composition as strand ____.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
verified
DNA forms a complimentary sequence which...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

-In Figure 25.4,when replication is finished,strand 1 will have the same base composition as strand _ while strand 2 will have the same base composition as strand __.

Correct Answer
verified