Question 1

Which level of primary control in eukaryotic gene activity involves the speed of transport of mRNA from the nucleus into the cytoplasm?

Accepted Answer

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

Question 2

In DNA, the amount of adenine is always equal to the amount of

Accepted Answer

A)   cytosine.
B)   uracil.
C)   guanine.
D)   thymine.
E)   ATP.F) A) and E)
G) A) and B)

Question 3

Which part of a mRNA molecule is edited out?

Accepted Answer

A)   exons.
B)   introns.
C)   transposons.
D)   inducers.
E)   promoters.F) C) and E)
G) B) and C)

Question 4

A cell of the pancreas specializes in producing insulin, while a muscle cell specializes in the production of the protein myosin. This means that

Accepted Answer

A)   the pancreas and muscle cells are both actively using the genes for insulin and myosin.
B)   the pancreas cells are actively using the insulin gene, while the muscle cells are actively using both the insulin and myosin genes.
C)   the pancreas cells are actively using the gene that produces insulin, while muscle cells are actively using the gene that produces myosin.
D)   neither the pancreas cells nor the muscle cells are specialized.
E)   only muscle cells can produce proteins.F) A) and B)
G) B) and D)

Question 5

The X-ray diffraction photography of Rosalind Franklin and Maurice Wilkins was critical to showing that

Accepted Answer

A)   DNA has a double-helix structure.
B)   the bases of DNA were held together by hydrogen bonds.
C)   DNA has equal numbers of purines and pyrimidines.
D)   DNA has deoxyribose sugar rather than ribose sugar.
E)   the four bases of DNA are adenine, guanine, cytosine, and thymine.F) A) and C)
G) C) and E)

Question 6

Summarize the process of DNA replication.

Accepted Answer

1. The enzyme DNA helicase unwinds and u...

Question 7

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 C)
G) D) and E)

Question 8

DNA segments at the ends of chromosomes that shorten every time a cell divides are called

Accepted Answer

A)   transposons.
B)   mutagens.
C)   activated chromatin.
D)   operons.
E)   telomeres.F) C) and D)
G) A) and C)

Question 9

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)   terminationF) C) and D)
G) A) and C)

Question 10

Which level of primary control in eukaryotic gene activity involves using differences in the poly-A tail or the guanine cap to determine how long a particular transcript remains active before it is destroyed?

Accepted Answer

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

Question 11

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-containing base.F) D) and E)
G) B) and D)

Question 12

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 the second helix.
E)   two new strands in one helix and two old strands in the other helix.F) A) and D)
G) None of the above

Question 13

Which of the following describes a function of the DNA helicase?

Accepted Answer

A)   connects the Okazaki fragments and seals any breaks in the sugar-phosphate backbone
B)   adds nucleotides to the growing 3' end of the new DNA strand
C)   creates the lagging strand in semiconservative replication
D)   unwinds and "unzips" the double-stranded DNA by breaking the weak hydrogen bonds between the paired bases
E)   re-creates the broken hydrogen bonds so that DNA becomes double-stranded againF) A) and B)
G) B) and D)

Question 14

Which is the process by which a protein is constructed in the cytoplasm of eukaryotic cells?

Accepted Answer

A)   translation
B)   transcription
C)   replication
D)   transformation
E)   translocationF) A) and E)
G) C) and D)

Question 15

Because every DNA molecule contains one old strand and one new strand, the process of DNA replication is called

Accepted Answer

A)   conservative.
B)   semiconservative.
C)   mixed.
D)   dispersive.E) None of the above
F) C) and D)

Question 16

Which of the following is 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)   All of the answer choices describe cancer.F) A) and D)
G) A) and B)

Question 17

Sometimes a newly folded protein must be modified before becoming functional. What level of gene control is this?

Accepted Answer

A)   transcriptional
B)   posttranscriptional
C)   translational
D)   posttranslational
E)   operonF) A) and B)
G) A) and C)

Question 18

Which of the following nucleotide bases is found only in RNA?

Accepted Answer

A)   guanine
B)   adenine
C)   thymine
D)   uracil
E)   cytosineF) All of the above
G) B) and C)

Question 19

The individual(s)  given the most credit for 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.F) B) and D)
G) A) and B)

Question 20

Chargaff's rules of DNA structure states that

Accepted Answer

A)   A + T = G + C.
B)   A = T, C = G
C)   A = C, T = G.
D)   A = G, T = C.
E)   the number of purines in DNA never equals the number of pyrimidines.F) None of the above
G) A) and C)

Exam 25: Dna Structure and Gene Expression

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

Correct AnswerverifiedShow Answer

Which of the following is associated with cancer?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which is the process by which a protein is constructed in the cytoplasm of eukaryotic cells?

Correct AnswerverifiedShow Answer

Which of the following nucleotide bases is found only in RNA?

Correct AnswerverifiedShow Answer

Chargaff's rules of DNA structure states that

Correct AnswerverifiedShow Answer

A cell of the pancreas specializes in producing insulin, while a muscle cell specializes in the production of the protein myosin. This means that

Correct AnswerverifiedShow Answer

The individual(s) given the most credit for the discovery of the structure of DNA is (are)

Correct AnswerverifiedShow Answer

DNA segments at the ends of chromosomes that shorten every time a cell divides are called

Correct AnswerverifiedShow Answer

The X-ray diffraction photography of Rosalind Franklin and Maurice Wilkins was critical to showing that

Correct AnswerverifiedShow Answer

Which part of a mRNA molecule is edited out?

Correct AnswerverifiedShow Answer

Which level of primary control in eukaryotic gene activity involves the speed of transport of mRNA from the nucleus into the cytoplasm?

Correct AnswerverifiedShow Answer

Which level of primary control in eukaryotic gene activity involves using differences in the poly-A tail or the guanine cap to determine how long a particular transcript remains active before it is destroyed?

Correct AnswerverifiedShow Answer

Which of the following describes a function of the DNA helicase?

Correct AnswerverifiedShow Answer

A nucleotide contains

Correct AnswerverifiedShow Answer

Sometimes a newly folded protein must be modified before becoming functional. What level of gene control is this?

Correct AnswerverifiedShow Answer

Because every DNA molecule contains one old strand and one new strand, the process of DNA replication is called

Correct AnswerverifiedShow Answer

In DNA, the amount of adenine is always equal to the amount of

Correct AnswerverifiedShow Answer

Summarize the process of DNA replication.

Correct Answerverified1. The enzyme DNA helicase unwinds and u...View AnswerShow Answer

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1. The enzyme DNA helicase unwinds and u...
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