Question 1

Which is NOT associated with cancer?

Accepted Answer

A)  It can establish new tumors distant from the site of the primary tumor.
B)  It forms new blood vessels and brings nutrients and oxygen to the tumor.
C)  Cancer cells can undergo cell division repeatedly and indefinitely.
D)  Tumors invade surrounding tissues and are filtered by lymph nodes.
E)  A malignant mass of cells is encapsulated and does not invade adjacent tissue.F) None of the above
G) A) and C)

Question 2

The genetic code consists of ____ bases that stand for one codon.

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  20F) C) and D)
G) A) and B)

Question 3

The _____ enzyme is responsible for unwinding the double-helix structure of DNA during replication.

Accepted Answer

A)  helicase
B)  polymerase
C)  ligase
D)  extendase
E)  windaseF) None of the above
G) All of the above

Question 4

In semiconservative DNA replication,each new double helix formed will have

Accepted Answer

A)  two new strands and two old strands.
B)  one new and one old strand in each helix.
C)  three new strands in one helix and three old strands in the second helix.
D)  two new and one old strand in one helix and two old and one new strand in second helix.
E)  two new strands in one helix and two old strands in the other helix.F) All of the above
G) A) and B)

Question 5

A gene is physically located on a _____ in the nucleus of a cell.

Accepted Answer

A)  chromosome
B)  messenger RNA
C)  enzymes
D)  proteins
E)  nucleusF) C) and E)
G) A) and E)

Question 6

Which of the following is NOT true about RNA?

Accepted Answer

A)  RNA transfers messages from DNA to ribosomes.
B)  RNA contains the sugar ribose.
C)  RNA contains adenine,guanine,uracil,and cytosine.
D)  RNA is single stranded.
E)  RNA forms a helix.F) None of the above
G) D) and E)

Question 7

Which of the classes of RNA molecules carries the genetic information from the nucleus as it is needed for the construction of a protein?

Accepted Answer

A)  ribosomal RNA
B)  transfer RNA
C)  messenger RNA
D)  primary mRNA transcript
E)  mature RNAF) A) and B)
G) A) and C)

Question 8

If the normal nucleotide sequence was TACGGCATG,what type of gene mutation is present if the resulting sequence becomes TAGGCATG?

Accepted Answer

A)  chromosomal mutation
B)  germinal mutation
C)  addition mutation
D)  deletion mutation
E)  substitution mutationF) None of the above
G) B) and C)

Question 9

The ____ of a tRNA molecule will base-pair with the codon of a mRNA molecule.

Accepted Answer

A)  DNA sequence
B)  anticodon
C)  amino acid binding site
D)  RNA polymerase
E)  promoter siteF) A) and D)
G) B) and D)

Question 10

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

Accepted Answer

A)  guanine
B)  adenine
C)  thymine
D)  uracil
E)  cytosineF) A) and E)
G) C) and D)

Question 11

Which of the classes of RNA molecules is linked with proteins in forming the large and small subunits of a cytoplasmic structure?

Accepted Answer

A)  ribosomal RNA
B)  transfer RNA
C)  messenger RNA
D)  primary mRNA transcript
E)  ribozymesF) B) and C)
G) A) and E)

Question 12

A cell of the pancreas would specialize in producing insulin,among other functions,while a muscle cell would specialize in the production of the protein myosin.This means that

Accepted Answer

A)  pancreas and muscle cells have the genes for both insulin and myosin active.
B)  the active gene in pancreas cells is the one for insulin,while the muscle cells have genes for insulin and myosin.
C)  pPancreas cells activate the gene that would produce insulin,while muscle cells activate the gene that would produce myosin.
D)  neither pancreas cells nor muscle cells are specialized.
E)  only muscle cells can produce proteins.F) A) and D)
G) B) and C)

Question 13

Gene mutations are

Accepted Answer

A)  always deleterious.
B)  always beneficial.
C)  radiation-induced changes only.
D)  alterations in the normal sequence of bases within a gene.
E)  alterations in the normal sequence of bases outside a gene.F) D) and E)
G) A) and C)

Question 14

An intervening sequence of DNA that is not expressed is called a(n)

Accepted Answer

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

Question 15

Identify the amino acids that would be assembled based upon the following codons: CGG AUA GAC GUA.

Accepted Answer

CGG would code for arginine. A...

Question 16

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

Question 17

Because one original strand of the double-stranded helix is found in each daughter cell,the replication process is called

Accepted Answer

A)  proofreading.
B)  semi-conservative.
C)  redundant.
D)  freeing of DNA.
E)  mutation positive.F) C) and D)
G) A) and E)

Question 18

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 B)
G) A) and C)

Question 19

The site of translation is the

Accepted Answer

A)  nucleus.
B)  nucleolus.
C)  ribosome.
D)  ribozyme.
E)  mitochondria.F) A) and E)
G) B) and E)

Question 20

Which of these is NOT a form of a point mutation?

Accepted Answer

A)  nonsense mutation
B)  missense mutation
C)  silent mutation
D)  frameshift mutation
E)  UAC becomes UAUF) A) and B)
G) C) and E)

Exam 25: Dna Structure and Control of Gene Expression

Which of the classes of RNA molecules carries the genetic information from the nucleus as it is needed for the construction of a protein?

Correct AnswerverifiedShow Answer

The site of translation is the

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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

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

Correct AnswerverifiedShow Answer

Which of the classes of RNA molecules is linked with proteins in forming the large and small subunits of a cytoplasmic structure?

Correct AnswerverifiedShow Answer

In semiconservative DNA replication,each new double helix formed will have

Correct AnswerverifiedShow Answer

Because one original strand of the double-stranded helix is found in each daughter cell,the replication process is called

Correct AnswerverifiedShow Answer

Which of these is NOT a form of a point mutation?

Correct AnswerverifiedShow Answer

A gene is physically located on a _____ in the nucleus of a cell.

Correct AnswerverifiedShow Answer

Identify the amino acids that would be assembled based upon the following codons: CGG AUA GAC GUA.

Correct AnswerverifiedCGG would code for arginine. A...View AnswerShow Answer

The ____ of a tRNA molecule will base-pair with the codon of a mRNA molecule.

Correct AnswerverifiedShow Answer

The genetic code consists of ____ bases that stand for one codon.

Correct AnswerverifiedShow Answer

Gene mutations are

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The _____ enzyme is responsible for unwinding the double-helix structure of DNA during replication.

Correct AnswerverifiedShow Answer

Which is NOT associated with cancer?

Correct AnswerverifiedShow Answer

Which of the following is NOT true about RNA?

Correct AnswerverifiedShow Answer

A cell of the pancreas would specialize in producing insulin,among other functions,while a muscle cell would specialize in the production of the protein myosin.This means that

Correct AnswerverifiedShow Answer

An intervening sequence of DNA that is not expressed is called a(n)

Correct AnswerverifiedShow Answer

If the normal nucleotide sequence was TACGGCATG,what type of gene mutation is present if the resulting sequence becomes TAGGCATG?

Correct AnswerverifiedShow Answer

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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 __.

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CGG would code for arginine. A...
View Answer

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