Question 1

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 D)
G) B) and D)

Question 2

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

Question 3

Which of the following have nitrogenous bases correctly paired in DNA?

Accepted Answer

A)  adenine-guanine; thymine-cytosine
B)  adenine-uracil; guanine-cytosine
C)  adenine-thymine; guanine-cytosine
D)  adenine-adenine; guanine-guanine
E)  adenine-cytosine; guanine-thymineF) All of the above
G) B) and C)

Question 4

Which of the following is not true of ribosomes?

Accepted Answer

A)   They are produced in the nucleus of a eukaryotic cell.
B)   They are made of RNA and proteins.
C)   They are composed of two subunits that only come together when protein synthesis is about to occur.
D)   They bind only one type of amino acid.
E)   DNA serves as a template for rRNA.F) A) and B)
G) B) and C)

Question 5

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

Accepted Answer

A)   tumor suppressor genes
B)   carcinogens
C)   repressors
D)   proto-oncogene proteins
E)   p53 geneF) A) and B)
G) C) and E)

Question 6

____________ bind to enhancers in eukaryotic cells to increase the rate of transcription.

Accepted Answer

A)   Repressors
B)   RNA polymerases
C)   Ligases
D)   Transcription activators
E)   DNA polymerasesF) B) and C)
G) None of the above

Question 7

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

Question 8

Active genes are found in the _______ of eukaryotic chromosomes.

Accepted Answer

A)   heterochromatin
B)   euchromatin
C)   Barr bodies
D)   promoters
E)   operonsF) B) and C)
G) A) and E)

Question 9

Which level of primary control in eukaryotic gene activity involves processing early RNA transcripts to mRNA and control of the rate at which mRNA leaves the nucleus?

Accepted Answer

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

Question 10

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

Accepted Answer

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

Question 11

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) B) and E)
G) A) and E)

Question 12

Summarize the process of DNA replication.

Accepted Answer

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

Question 13

If one strand of DNA has the base sequence AAGCAA,the complementary strand has which of the following sequences?

Accepted Answer

A)  UUCGUU
B)  TTCGTT
C)  AAGCAA
D)  UTCGTU
E)  TTCGTGF) B) and E)
G) None of the above

Question 14

Two strains of E.coli-one of which can turn on its lactase production and one that cannot-are grown together with lactose in the medium.If all other conditions are equal,what will occur?

Accepted Answer

A)   Both strains will continue to be present in equal amounts.
B)   The two strains will kill each other off.
C)   The strain that can turn on lactase production will overgrow the culture and be the only one left.
D)   The strain that cannot turn on lactase production will overgrow the culture and be the only one left.
E)   The strain that can turn on lactase production will make its own lactose once the lactose present in the medium is completely used.F) B) and C)
G) A) and E)

Question 15

In eukaryotes,control of gene expression is NOT by

Accepted Answer

A)   translational control in cytoplasm after mRNA leaves the nucleus and before protein is produced.
B)   transcriptional control in the nucleus based on which genes are transcribed and how fast they are transcribed.
C)   posttranscriptional control in the nucleus after DNA is transcribed, including the speed with which mRNA leaves the nucleus.
D)   posttranslational control in the cytoplasm that occurs after protein synthesis.
E)   the use of repressor proteins and operators.F) B) and C)
G) All of the above

Question 16

Chargaff's rules of DNA structure states that

Accepted Answer

A)  A + T = G + C.
B)  A + G = T + C.
C)  A = C,T = G.
D)  A = G,T = C.
E)  the number of purines in DNA never equals the number of pyrimidines.F) B) and C)
G) D) and E)

Question 17

Which of the following behaviors will not help prevent cancer?

Accepted Answer

A)   avoid carcinogenic chemicals
B)   avoid excessive sunlight
C)   lower total fat intake
D)   decrease intake of high-fiber foods
E)   increase consumption of broccoliF) B) and C)
G) A) and B)

Question 18

The X-ray diffraction photography of Rosalind Franklin and Maurice Wilkins was critical evidence

Accepted Answer

A)   indicating that DNA has a double helix structure.
B)   showing the bases of DNA were held together by hydrogen bonds.
C)   showing equal numbers of purines and pyrimidines.
D)   revealing the structure of the deoxyribose sugar.
E)   of the location of each adenine, guanine, cytosine, and thymine.F) C) and D)
G) A) and B)

Question 19

If the gene product needed is either transfer RNA or ribosomal RNA,the most efficient way to produce this product is

Accepted Answer

A)   activating chromatin.
B)   increasing transcription factors.
C)   increasing the rate mRNA matures.
D)   increasing translational control.
E)   increasing posttranscriptional control.F) B) and E)
G) C) and E)

Question 20

The hereditary material found in all cells is

Accepted Answer

A)   DNA.
B)   rRNA.
C)   mRNA.
D)   tRNA.
E)   ATP.F) B) and E)
G) A) and D)

Exam 25: DNA Structure and Gene Expression

Which of the following have nitrogenous bases correctly paired in DNA?

Correct AnswerverifiedShow Answer

In eukaryotes,control of gene expression is NOT by

Correct AnswerverifiedShow Answer

The X-ray diffraction photography of Rosalind Franklin and Maurice Wilkins was critical evidence

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Summarize the process of DNA replication.

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

If the gene product needed is either transfer RNA or ribosomal RNA,the most efficient way to produce this product is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Two strains of E.coli-one of which can turn on its lactase production and one that cannot-are grown together with lactose in the medium.If all other conditions are equal,what will occur?

Correct AnswerverifiedShow Answer

Chargaff's rules of DNA structure states that

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The hereditary material found in all cells is

Correct AnswerverifiedShow Answer

____________ bind to enhancers in eukaryotic cells to increase the rate of transcription.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which level of primary control in eukaryotic gene activity involves processing early RNA transcripts to mRNA and control of the rate at which mRNA leaves the nucleus?

Correct AnswerverifiedShow Answer

If one strand of DNA has the base sequence AAGCAA,the complementary strand has which of the following sequences?

Correct AnswerverifiedShow Answer

Which of the following is not true of ribosomes?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Gene mutations are

Correct AnswerverifiedShow Answer

Which of the following behaviors will not help prevent cancer?

Correct AnswerverifiedShow Answer

Active genes are found in the _______ of eukaryotic chromosomes.

Correct AnswerverifiedShow Answer

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