Question 1

Tumor-suppressor genes are

Accepted Answer

A)   oncogenes that code for proteins that inhibit cell division.
B)   genes that code for proteins that inhibit cell division.
C)   oncogenes that code for proteins that stimulate cell division.
D)   anti-oncogenes that code for proteins that stimulate cell division.
E)   transposons that can be used as cancer therapy.F) A) and B)
G) A) and E)

Question 2

A gene is physically located on a(n)

Accepted Answer

A)   chromosome.
B)   transfer RNA.
C)   enzyme.
D)   protein.
E)   nucleus.F) A) and B)
G) A) and C)

Question 3

If a species contains 23% A in its DNA, what is the percentage of guanine it would contain?

Accepted Answer

A)   23%
B)   46%
C)   25%
D)   44%
E)   27%F) A) and D)
G) A) and C)

Question 4

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) A) and E)
G) D) and E)

Question 5

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 was essential to the success of the 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)   All of the answer choices describe information that was necessary for the success of the experiment.F) A) and B)
G) A) and C)

Question 6

Which type of RNA carries the genetic information from the nucleus to the ribosome?

Accepted Answer

A)   ribosomal RNA
B)   transfer RNA
C)   messenger RNA
D)   All types of RNA can carry the information from the nucleus to the ribosome.E) A) and C)
F) A) and D)

Question 7

After their experiment, Hershey and Chase concluded that the radioactively labeled sulfur, but not the phosphorus, was found within the bacteria.

Accepted Answer

A) True 
 B)False  False

Question 8

Which scientist(s)  is/are noted for their X-ray diffraction photo of DNA?

Accepted Answer

A)   Chargaff
B)   Griffith
C)   Messelson and Stahl
D)   Franklin
E)   Hershey and ChaseF) C) and D)
G) A) and E) D

Question 9

Which of the following bases pairs with adenine in DNA?

Accepted Answer

A)   guanine
B)   adenine
C)   thymine
D)   uracil
E)   cytosineF) A) and D)
G) None of the above

Question 10

Which of the following levels of control involves the use of a poly-A tail?

Accepted Answer

A)   pretranscriptional
B)   transcriptional
C)   posttranscriptional
D)   transcriptional control
E)   translationalF) A) and B)
G) D) and E)

Question 11

A sequence of mRNA that is removed during processing is a(n)

Accepted Answer

A)   exon.
B)   intron.
C)   replicon.
D)   promoter.
E)   gene.F) A) and B)
G) A) and C)

Question 12

Which of the following is true about DNA?

Accepted Answer

A)   transfers messages to the ribosomes
B)   contains the sugar ribose
C)   contains adenine, guanine, uracil, and cytosine
D)   is single stranded
E)   forms a helixF) All of the above
G) C) and D)

Question 13

The enzyme that is used to join DNA nucleotides together is

Accepted Answer

A)   DNA polymerase.
B)   RNA polymerase.
C)   helicase.
D)   primase.
E)   lipase.F) B) and E)
G) D) and E)

Question 14

Which of the following statements about DNA replication is correct?

Accepted Answer

A)   As hydrogen bonds break, the DNA molecule unwinds.
B)   The process is known as semiconservative replication because one old strand is conserved in the new molecule.
C)   The enzyme that catalyzes DNA replication is DNA polymerase.
D)   Complementary base pairs are held together with hydrogen bonds.
E)   All of the answer choices are correct statements about DNA replication.F) A) and D)
G) A) and E)

Question 15

Which of the following describes the flow of information in protein synthesis?

Accepted Answer

A)   protein → RNA → DNA
B)   DNA → RNA → protein
C)   DNA → protein → RNA
D)   RNA → DNA → protein
E)   RNA → protein → DNAF) A) and B)
G) A) and E)

Question 16

Which of the following is part of DNA replication?

Accepted Answer

A)   transcription
B)   lagging strand
C)   translation
D)   amino acids
E)   protein synthesisF) C) and D)
G) A) and D)

Question 17

The hereditary material found in all cells is

Accepted Answer

A)   DNA.
B)   rRNA.
C)   mRNA.
D)   tRNA.
E)   ATP.F) A) and E)
G) None of the above

Question 18

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.F) C) and D)
G) A) and E)

Question 19

Which of the following is true about cancer cells?

Accepted Answer

A)   They exhibit uncontrolled growth.
B)   They can form benign or malignant tumors.
C)   They exhibit disorganized growth.
D)   They may undergo metastasis.
E)   All of the answer choices are true statements about cancer.F) B) and E)
G) B) and D)

Question 20

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

Accepted Answer

DNA forms a complementary sequence based on Chargaff's rule (A-T, C-G). Thus, the complementary nucleotide sequence would be TTACGCATATGC.

Exam 25: Dna Structure and Gene Expression

Tumor-suppressor genes are

Correct AnswerverifiedShow Answer

A gene is physically located on a(n)

Correct AnswerverifiedShow Answer

If a species contains 23% A in its DNA, what is the percentage of guanine it would contain?

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

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 was essential to the success of the experiment?

Correct AnswerverifiedShow Answer

Which type of RNA carries the genetic information from the nucleus to the ribosome?

Correct AnswerverifiedShow Answer

After their experiment, Hershey and Chase concluded that the radioactively labeled sulfur, but not the phosphorus, was found within the bacteria.

Correct AnswerverifiedFalse

Which scientist(s) is/are noted for their X-ray diffraction photo of DNA?

Correct AnswerverifiedD

Which of the following bases pairs with adenine in DNA?

Correct AnswerverifiedShow Answer

Which of the following levels of control involves the use of a poly-A tail?

Correct AnswerverifiedShow Answer

A sequence of mRNA that is removed during processing is a(n)

Correct AnswerverifiedShow Answer

Which of the following is true about DNA?

Correct AnswerverifiedShow Answer

The enzyme that is used to join DNA nucleotides together is

Correct AnswerverifiedShow Answer

Which of the following statements about DNA replication is correct?

Correct AnswerverifiedShow Answer

Which of the following describes the flow of information in protein synthesis?

Correct AnswerverifiedShow Answer

Which of the following is part of DNA replication?

Correct AnswerverifiedShow Answer

The hereditary material found in all cells is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is true about cancer cells?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedDNA forms a complementary sequence based on Chargaff's rule (A-T, C-G). Thus, the complementary nucleotide sequence would be TTACGCATATGC.

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False

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D

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DNA forms a complementary sequence based on Chargaff's rule (A-T, C-G). Thus, the complementary nucleotide sequence would be TTACGCATATGC.