Question 1

After a long week of sunbathing on the beach,what type of DNA damage might you be concerned about?

Accepted Answer

A)  photolyase-induced mutations
B)  decreased telomere length
C)  thymine dimers
D)  uvr A,B,and CE) B) and C)
F) A) and D)

Question 2

The units of hereditary information is(are) called _____.

Accepted Answer

A)  genes
B)  DNA
C)  RNA
D)  chromosomesE) B) and C)
F) None of the above

Question 3

Which of the following statements about replication of DNA is false?

Accepted Answer

A)  The two strands are separated.
B)  Each strand is used as a template for making a new duplex.
C)  The synthesis on each strand is in the opposite direction.
D)  The newly synthesized DNA is packaged into one nucleus,and the old DNA is packaged into another nucleus.E) A) and D)
F) B) and D)

Question 4

The structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of bases.

Accepted Answer

A)  Hershey and Chase
B)  Chargaff
C)  Franklin
D)  Watson and CrickE) B) and C)
F) C) and D)

Question 5

Nucleotides have phosphates attached at the ___ carbon atom of the sugar.

Accepted Answer

A)  8'
B)  3'
C)  5'
D)  1'E) C) and D)
F) A) and B)

Question 6

DNA pol III synthesizes the leading strand as a continuous strand.The lagging strands are synthesized in segments,called

Accepted Answer

A)  parental DNA.
B)  Chargaff's segments.
C)  repeating primers.
D)  replisomes.
E)  Okazaki fragments.F) A) and C)
G) A) and D)

Question 7

Xeroderma Pigmentosum (XP) is a rare autosomal recessive disorder.Patients with XP exhibit a cellular hypersensitivity to ultraviolet (UV) radiation,a high incidence of skin cancer and premature aging.Based on these clinical characteristics,what is the underlying cause for this disease?

Accepted Answer

A)  defects in DNA repair
B)  defects in DNA replication
C)  lack of telomerase activity
D)  shortened telomeresE) C) and D)
F) A) and D)

Question 8

The synthesis of the growing chain of DNA is carried out by adding nucleotides to the ___ end.

Accepted Answer

A)  8'
B)  3'
C)  5'
D)  1'E) A) and B)
F) A) and D)

Question 9

Which of the following DNA sequences is complementary to 5' ATGGTCAGT 3'?

Accepted Answer

A)  5' ATGGTCAGT 3'
B)  5' TGACTGGTA 3'
C)  5' TACCAGTCA 3'
D)  5' ACTGACCAT 3'E) B) and D)
F) A) and D)

Question 10

If a short sequence of DNA is AATTGCCGT,its complement is

Accepted Answer

A)  AAAACGCCA.
B)  TTAACGGCT.
C)  TTAACGGCA.
D)  TTAAGCCGA.E) All of the above
F) B) and C)

Question 11

A scientist developed a procedure that would cause a particular chemical to bind with the nitrogen base adenine.If this chemical were applied prior to S in the cell cycle,what might be a logical prediction of the outcome?

Accepted Answer

A)  The DNA replication would proceed except that all adenine would have the chemical bound to it and is incorporated into the new sister chromatids.
B)  The DNA replication would proceed except that everywhere an adenine was supposed to be,a thymine was substituted into the new developing strand.
C)  The DNA replication would proceed except cytosine and guanine would continue to form base pairs.
D)  The DNA replication would stop because if adenine were bound then thymine would not have a complement with which to base pair.E) A) and B)
F) None of the above

Question 12

Griffith,a British microbiologist,used a bacteria and mice to demonstrate transformation.His results clearly offered evidence for that process.Transformation is

Accepted Answer

A)  the ability for bacterial homologous chromosomes to transform themselves into an exact copy,sometimes referred to as DNA replication.
B)  the ability of the nucleus of a cell to regenerate and repair itself when damaged by bacterial infections.
C)  the ability of the infected mice to transform the bacteria from pathogenic to non-pathogenic during the experiments.
D)  the ability to transfer genetic materials from one cell to another.
E)  the ability for the nucleus of a bacterial cell to bypass the process of DNA replication by transforming into a spore during unsuitable environmental conditions.F) A) and E)
G) A) and D)

Question 13

DNA primase

Accepted Answer

A)  creates a short RNA primer complementary to the RNA template.
B)  creates a short DNA primer complementary to the RNA template.
C)  creates a short DNA primer complementary to the DNA template.
D)  creates a short template of an RNA primer that is complementary to the DNA primer.
E)  creates a short RNA primer complementary to the DNA templatE.F) B) and E)
G) A) and E)

Question 14

Griffith worked with

Accepted Answer

A)  bacteriophage.
B)  Drosophila.
C)  frog eggs.
D)  Streptococcus.E) None of the above
F) All of the above

Question 15

Watson and Crick developed a model of DNA in which the two strands twist into the shape of a _________________.

Accepted Answer

A)  circle
B)  helix
C)  double helix
D)  double pleated sheetE) A) and B)
F) C) and D)

Question 16

DNA always contain amounts of the four bases,A,G,C,and T,characteristic of the species,but A = T and G = C,and purines equals pyrimidines.

Accepted Answer

A)  Hershey and Chase
B)  Chargaff
C)  Franklin
D)  Watson and CrickE) C) and D)
F) None of the above

Question 17

Eukaryotic organisms solve the problem of time constraints on replication of DNA by

Accepted Answer

A)  elimination of the initiation phase,thus shorten the length of the replication process.
B)  producing several sliding clamp complexes that allow DNA pol III enzymes more binding sites.
C)  allowing DNA gyrase to unravel the double helix faster than the DNA helicase,which then speeds up the formation of the replication folk.
D)  using multiple origins of the replication on each chromosome,which results in multiple replicons.E) None of the above
F) All of the above

Question 18

Which of the following choices is the correct sequence for DNA replication in

Accepted Answer

A)  initiation,termination,elongation
B)  initiation,elongation,termination
C)  elongation,termination,initiation
D)  elongation,initiation,termination
E)  coli?F) A) and D)
G) A) and E)

Question 19

The reading of the bases along the length of a nucleic acid molecule for either transcription or translation is done from the

Accepted Answer

A)  1' end.
B)  2' end.
C)  3' end.
D)  4' enD.
E)  5' end.F) A) and D)
G) A) and C)

Question 20

Why is it essential for the nitrogenous bases to remain in one tautomeric form when part of a DNA molecule?

Accepted Answer

A)  It allows the width between the phosphate strands to remain consistent.
B)  It is essential for proper base pairing of A with T and C with G.
C)  The presence of additional tautomeric forms would violate Chargaff's rules.
D)  The presence of additional tautomeric forms would cause the two DNA strands to form a parallel configuration rather than an antiparallel configuration.E) B) and D)
F) All of the above

Exam 14: Dna: the Genetic Material

Griffith worked with

Correct AnswerverifiedShow Answer

The units of hereditary information is(are) called _____.

Correct AnswerverifiedShow Answer

If a short sequence of DNA is AATTGCCGT,its complement is

Correct AnswerverifiedShow Answer

The reading of the bases along the length of a nucleic acid molecule for either transcription or translation is done from the

Correct AnswerverifiedShow Answer

DNA pol III synthesizes the leading strand as a continuous strand.The lagging strands are synthesized in segments,called

Correct AnswerverifiedShow Answer

Which of the following statements about replication of DNA is false?

Correct AnswerverifiedShow Answer

The structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of bases.

Correct AnswerverifiedShow Answer

The synthesis of the growing chain of DNA is carried out by adding nucleotides to the ___ end.

Correct AnswerverifiedShow Answer

Which of the following DNA sequences is complementary to 5' ATGGTCAGT 3'?

Correct AnswerverifiedShow Answer

Watson and Crick developed a model of DNA in which the two strands twist into the shape of a _________________.

Correct AnswerverifiedShow Answer

DNA always contain amounts of the four bases,A,G,C,and T,characteristic of the species,but A = T and G = C,and purines equals pyrimidines.

Correct AnswerverifiedShow Answer

After a long week of sunbathing on the beach,what type of DNA damage might you be concerned about?

Correct AnswerverifiedShow Answer

A scientist developed a procedure that would cause a particular chemical to bind with the nitrogen base adenine.If this chemical were applied prior to S in the cell cycle,what might be a logical prediction of the outcome?

Correct AnswerverifiedShow Answer

Nucleotides have phosphates attached at the ___ carbon atom of the sugar.

Correct AnswerverifiedShow Answer

Eukaryotic organisms solve the problem of time constraints on replication of DNA by

Correct AnswerverifiedShow Answer

DNA primase

Correct AnswerverifiedShow Answer

Griffith,a British microbiologist,used a bacteria and mice to demonstrate transformation.His results clearly offered evidence for that process.Transformation is

Correct AnswerverifiedShow Answer

Xeroderma Pigmentosum (XP) is a rare autosomal recessive disorder.Patients with XP exhibit a cellular hypersensitivity to ultraviolet (UV) radiation,a high incidence of skin cancer and premature aging.Based on these clinical characteristics,what is the underlying cause for this disease?

Correct AnswerverifiedShow Answer

Which of the following choices is the correct sequence for DNA replication in

Correct AnswerverifiedShow Answer

Why is it essential for the nitrogenous bases to remain in one tautomeric form when part of a DNA molecule?

Correct AnswerverifiedShow Answer

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