Question 1

Which of the following serve to directly accelerate the cell cycle?

Accepted Answer

A) tumor suppressor genes 
B) carcinogens 
C) repressors 
D) oncogene proteins 
E) p53 gene 
A) tumor suppressor genes 
B) carcinogens 
C) repressors 
D) oncogene proteins 
E) p53 gene D

Question 2

The addition of a poly-A tail to mRNA occurs after which of the following?

Accepted Answer

A) replication 
B) transcription 
C) translation 
D) translocation 
E) termination 
A) replication 
B) transcription 
C) translation 
D) translocation 
E) termination B

Question 3

If the protein coat of a virus that infects a bacterium is labeled with radioactive sulfur and the DNA of the virus is labeled with radioactive phosphorus,over time

Accepted Answer

A) both the sulfur and the phosphorus will be found within the bacterium. 
B) only the sulfur will be found inside the bacterium. 
C) only the phosphorus will be found inside the bacterium. 
D) both the sulfur and the phosphorus will be found outside the bacterium. 
E) the radioactivity of the sulfur and phosphorus will decay very quickly and not be detectable. 
A) both the sulfur and the phosphorus will be found within the bacterium. 
B) only the sulfur will be found inside the bacterium. 
C) only the phosphorus will be found inside the bacterium. 
D) both the sulfur and the phosphorus will be found outside the bacterium. 
E) the radioactivity of the sulfur and phosphorus will decay very quickly and not be detectable. C

Question 4

In Figure 25.4,if adenine is located on strand 4,then on strand 2 at the same location ____ must be present.

Accepted Answer

A) adenine 
B) thymine 
C) cytosine 
D) guanine 
E) uracil 
A) adenine 
B) thymine 
C) cytosine 
D) guanine 
E) uracil

Question 5

Artificial RNA with a known base sequence was added to a medium containing bacterial ribosomes and a mixture of amino acids.By chemical identification of the resulting polypeptide,researchers could discover the

Accepted Answer

A) transcription factors involved. 
B) mutation rate. 
C) codon. 
D) Chargaff rule. 
E) difference between DNA and RNA. 
A) transcription factors involved. 
B) mutation rate. 
C) codon. 
D) Chargaff rule. 
E) difference between DNA and RNA.

Question 6

Which of the following is NOT true about DNA?

Accepted Answer

A) has a double helix 
B) bases held together by hydrogen bonds 
C) bases are complementary to each other 
D) has a deoxyribose sugar 
E) contains adenine,guanine,cytosine,and uracil 
A) has a double helix 
B) bases held together by hydrogen bonds 
C) bases are complementary to each other 
D) has a deoxyribose sugar 
E) contains adenine,guanine,cytosine,and uracil

Question 7

Which of the following nucleotide bases is found only in DNA,not in RNA?

Accepted Answer

A) guanine 
B) adenine 
C) thymine 
D) uracil 
E) cytosine 
A) guanine 
B) adenine 
C) thymine 
D) uracil 
E) cytosine

Question 8

An oncogene is

Accepted Answer

A) a viral gene with no relation to the host cells genes. 
B) a mutated form of a proto-oncogene. 
C) a bacterial gene that causes cancer in the host. 
D) always seen in human cancer cells. 
E) a gene that turns off cellular reproduction. 
A) a viral gene with no relation to the host cells genes. 
B) a mutated form of a proto-oncogene. 
C) a bacterial gene that causes cancer in the host. 
D) always seen in human cancer cells. 
E) a gene that turns off cellular reproduction.

Question 9

Specific DNA sequences that have the ability to move within and out of chromosomes are called

Accepted Answer

A) transposons. 
B) introns. 
C) exons. 
D) operators. 
E) ribozymes. 
A) transposons. 
B) introns. 
C) exons. 
D) operators. 
E) ribozymes.

Question 10

The correct sequence of events in the production of a polypeptide is

Accepted Answer

A) initiation$\rightarrow$ termination $\rightarrow$elongation. 
B) elongation $\rightarrow$termination $\rightarrow$initiation. 
C) termination $\rightarrow$ elongation $\rightarrow$initiation. 
D) elongation $\rightarrow$initiation $\rightarrow$termination. 
E) initiation $\rightarrow$elongation$\rightarrow$ termination. 
A) initiation$\rightarrow$ termination $\rightarrow$elongation. 
B) elongation $\rightarrow$termination $\rightarrow$initiation. 
C) termination $\rightarrow$ elongation $\rightarrow$initiation. 
D) elongation $\rightarrow$initiation $\rightarrow$termination. 
E) initiation $\rightarrow$elongation$\rightarrow$ termination.

Question 11

Which statement is NOT correct about the results of the Hershey-Chase experiment with the T2 virus?

Accepted Answer

A) Radioactively labeled protein was found in the bacteria,not in the virus coats. 
B) Radioactively labeled DNA was found in the bacteria,not in the virus coats. 
C) DNA was labeled with radioactive phosphorus. 
D) Protein was labeled with radioactive sulfur. 
E) Two separate experiments were actually run,one with radioactive phosphorus and one with radioactive sulfur. 
A) Radioactively labeled protein was found in the bacteria,not in the virus coats. 
B) Radioactively labeled DNA was found in the bacteria,not in the virus coats. 
C) DNA was labeled with radioactive phosphorus. 
D) Protein was labeled with radioactive sulfur. 
E) Two separate experiments were actually run,one with radioactive phosphorus and one with radioactive sulfur.

Question 12

Which does NOT describe a function of the DNA polymerase molecule?

Accepted Answer

A) recognize the free nucleotide that pairs with the base on the old strand of DNA 
B) read the strand of old DNA and recognize the base there 
C) proofread to ensure that the proper base has been incorporated 
D) make the proper nucleotide to match with the base read on the old strand 
E) nucleotides are joined by hydrogen bonds 
A) recognize the free nucleotide that pairs with the base on the old strand of DNA 
B) read the strand of old DNA and recognize the base there 
C) proofread to ensure that the proper base has been incorporated 
D) make the proper nucleotide to match with the base read on the old strand 
E) nucleotides are joined by hydrogen bonds

Question 13

The enzyme that is used to join complementary DNA nucleotides together is

Accepted Answer

A) DNA polymerase. 
B) RNA polymerase. 
C) helicase. 
D) ribozyme. 
E) lipase. 
A) DNA polymerase. 
B) RNA polymerase. 
C) helicase. 
D) ribozyme. 
E) lipase.

Question 14

Which of the following statements about DNA replication is NOT correct?

Accepted Answer

A) Unwinding of the DNA molecule occurs as hydrogen bonds break. 
B) Replication occurs as each base is paired with another exactly like it. 
C) The process is known as semi-conservative replication because one old strand is conserved in the new molecule. 
D) The enzyme that catalyzes DNA replication is DNA polymerase. 
E) Complementary base pairs are held together with hydrogen bonds. 
A) Unwinding of the DNA molecule occurs as hydrogen bonds break. 
B) Replication occurs as each base is paired with another exactly like it. 
C) The process is known as semi-conservative replication because one old strand is conserved in the new molecule. 
D) The enzyme that catalyzes DNA replication is DNA polymerase. 
E) Complementary base pairs are held together with hydrogen bonds.

Question 15

A cluster of prokaryotic genes under the control of one regulatory sequence is called a(n)

Accepted Answer

A) repressor. 
B) promoter. 
C) operon. 
D) operator. 
E) regulator gene. 
A) repressor. 
B) promoter. 
C) operon. 
D) operator. 
E) regulator gene.

Question 16

The individual(s)credited with the discovery of the structure of DNA is (are)

Accepted Answer

A) Alfred Hershey and Martha Chase. 
B) James Watson and Francis Crick. 
C) Erwin Chargaff. 
D) Rosalind Franklin and Maurice Wilkins. 
E) Charles Darwin and Gregor Mendel. 
A) Alfred Hershey and Martha Chase. 
B) James Watson and Francis Crick. 
C) Erwin Chargaff. 
D) Rosalind Franklin and Maurice Wilkins. 
E) Charles Darwin and Gregor Mendel.

Question 17

A nucleotide contains

Accepted Answer

A) DNA and RNA. 
B) a sugar and a phosphate. 
C) complementary purines and pyrimidines. 
D) RNA,protein,and lipids. 
E) a sugar,a phosphate,and a nitrogen base. 
A) DNA and RNA. 
B) a sugar and a phosphate. 
C) complementary purines and pyrimidines. 
D) RNA,protein,and lipids. 
E) a sugar,a phosphate,and a nitrogen base.

Question 18

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

Question 19

The function of the regulator gene is to

Accepted Answer

A) code for enzymes in a metabolic pathway. 
B) serve as an on/off switch for transcription. 
C) code for a repressor molecule that can bind to the operator. 
D) bind to the RNA polymerase molecule. 
E) bind to the promoter. 
A) code for enzymes in a metabolic pathway. 
B) serve as an on/off switch for transcription. 
C) code for a repressor molecule that can bind to the operator. 
D) bind to the RNA polymerase molecule. 
E) bind to the promoter.

Question 20

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. 
A) DNA replication. 
B) error correction by proofreading enzymes. 
C) mRNA processing. 
D) translation. 
E) intron removal.

Exam 25: Dna Structure and Control of Gene Expression

Which of the following serve to directly accelerate the cell cycle?

The addition of a poly-A tail to mRNA occurs after which of the following?

If the protein coat of a virus that infects a bacterium is labeled with radioactive sulfur and the DNA of the virus is labeled with radioactive phosphorus,over time

In Figure 25.4,if adenine is located on strand 4,then on strand 2 at the same location ____ must be present.

Artificial RNA with a known base sequence was added to a medium containing bacterial ribosomes and a mixture of amino acids.By chemical identification of the resulting polypeptide,researchers could discover the

Which of the following is NOT true about DNA?

Which of the following nucleotide bases is found only in DNA,not in RNA?

An oncogene is

Specific DNA sequences that have the ability to move within and out of chromosomes are called

The correct sequence of events in the production of a polypeptide is

Which statement is NOT correct about the results of the Hershey-Chase experiment with the T2 virus?

Which does NOT describe a function of the DNA polymerase molecule?

The enzyme that is used to join complementary DNA nucleotides together is

Which of the following statements about DNA replication is NOT correct?

A cluster of prokaryotic genes under the control of one regulatory sequence is called a(n)

The individual(s)credited with the discovery of the structure of DNA is (are)

A nucleotide contains

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

The function of the regulator gene is to

Initiation,elongation,and termination are three stages in

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Which statement is NOT correct about the results of the Hershey-Chase experiment with the T₂ virus?