Question 1

In DNA,complementary nitrogen bases are held together by

Accepted Answer

A)  nitrogen bonds.
B)  hydrogen bonds.
C)  hydrophobic bonds.
D)  peptide bonds.
E)  phosphodiester bonds.F) A) and B)
G) B) and E)

Question 2

In 1952,Hershey and Chase confirmed Avery's (1944) conclusion that

Accepted Answer

A)  proteins are the repositories for hereditary information.
B)  DNA is the repository for hereditary information.
C)  RNA is the repository for hereditary information.
D)  each DNA molecule is composed of two strands that are twisted into a double helix.
E)  the replication of DNA is semiconservative.F) A) and B)
G) B) and E)

Question 3

You are asked to participate in a clinical trial for a new drug that can activate telomerase.Which of the following is a likely risk of such a drug?

Accepted Answer

A)  decreased capacity for tissue repair
B)  increased vulnerability to cancer
C)  premature aging
D)  decreased telomere lengthE) None of the above
F) A) and B)

Question 4

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 most likely cause for this disease?

Accepted Answer

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

Question 5

________ is the genetic material for all cellular organisms and some viruses.

Accepted Answer

A)  RNA
B)  DNA
C)  Protein
D)  ChromatinE) C) and D)
F) A) and C)

Question 6

After DNA replication is complete,each strand of the original molecule is bound to a new complementary strand.This process is known as

Accepted Answer

A)  disruptive replication.
B)  conservative replication.
C)  semiconservative replication.
D)  dispersive replication.
E)  stabilizing replication.F) All of the above
G) C) and E)

Question 7

Eukaryotic organisms speed up the process of DNA replication by

Accepted Answer

A)  shortening the initiation phase.
B)  producing several sliding clamp complexes which provide more binding sites for DNA pol III.
C)  using DNA gyrase to unravel the double helix rather than DNA helicase.
D)  using multiple origins of replication on each chromosome.E) A) and B)
F) A) and C)

Question 8

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) B) and D)
F) A) and C) C

Question 9

Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a

Accepted Answer

A)  helix.
B)  ribbon.
C)  hollow cylinder.
D)  pleated sheet.
E)  icosahedron.F) B) and E)
G) D) and E)

Question 10

The ends of linear chromosomes that maintain chromosome integrity are called

Accepted Answer

A)  telomeres
B)  the replisome
C)  thymine dimers
D)  kinetochores
E)  kinetinF) B) and E)
G) C) and D)

Question 11

Deoxyribose has a carbon atom that is not part of the pentose ring.In a nucleotide,what is attached to this carbon?

Accepted Answer

A)  a nitrogenous base
B)  a phosphate group
C)  three hydrogen atoms
D)  one hydrogen atomE) A) and D)
F) A) and C) B

Question 12

The method of DNA replication,where each original strand is used as a template to build a new strand,is called the

Accepted Answer

A)  conservative method.
B)  semiconservative method.
C)  disruptive method.
D)  continuous method.
E)  replication and amplification method.F) All of the above
G) A) and E)

Question 13

The replisome has two main subcomponents.They are

Accepted Answer

A)  the replication folk and the sliding clamp subunit.
B)  the primosome and the sliding clamp subunit.
C)  the replication folk and the DNA pol III enzymes.
D)  the DNA pol III enzymes and the sliding clamp subunits.
E)  the primosome and the DNA pol III enzymes.F) C) and D)
G) A) and C)

Question 14

If a mutation prevented synthesis of the beta subunit of DNA pol III,which would be most affected?

Accepted Answer

A)  DNA unwinding
B)  formation of RNA primers
C)  formation of the replication fork
D)  processivity
E)  removal of RNA primersF) C) and D)
G) All of the above

Question 15

If a short sequence of DNA is 5' AATTGCCGT 3',its complement is

Accepted Answer

A)  5' AAAACGCCA 3'.
B)  3' TTAACGGCT 5'.
C)  3' TTAACGGCA 5'.
D)  3' TTAAGCCGA 5'.
E)  5' TTAACGGCA 3'.F) A) and B)
G) A) and C)

Question 16

Who proposed that in any DNA molecule,A = T and G = C?

Accepted Answer

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

Question 17

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) A) and B)
F) All of the above

Question 18

Based on their experiment with T2 bacteriophages,Hershey and Chase concluded that

Accepted Answer

A)  DNA replication is semiconservative.
B)  the phage coat contains the genetic material.
C)  DNA functions as the genetic material.
D)  A always pairs with T and G always pairs with C.
E)  virulent bacteria can transform nonvirulent bacteria.F) D) and E)
G) A) and B)

Question 19

I think the proactive stance is a better attitude to promote than after-the-fact worrying! When planning a long week of sunbathing on the beach,What type of DNA damage should sunbathers be aware of before hitting the beach?

Accepted Answer

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

Question 20

You are asked to give a classroom demonstration of DNA supercoiling.To do so,you take two different colored pieces of rubber tubing,twist them very tightly and excessively around each other and join the ends of the tubing appropriately.Next,you relieve the supercoiling by breaking one strand and unwinding it.In this demonstration,the breaking and unwinding to relieve the supercoiling simulates the action of

Accepted Answer

A)  exonucleases.
B)  polymerases.
C)  ligases.
D)  topoisomerases.
E)  primases.F) A) and B)
G) A) and E)

Exam 14: Dna: the Genetic Material

In DNA,complementary nitrogen bases are held together by

Correct Answer
verified

In 1952,Hershey and Chase confirmed Avery's (1944) conclusion that

Correct Answer
verified

You are asked to participate in a clinical trial for a new drug that can activate telomerase.Which of the following is a likely risk of such a drug?

Correct Answer
verified

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 most likely cause for this disease?

Correct Answer
verified
A

________ is the genetic material for all cellular organisms and some viruses.

Correct Answer
verified

After DNA replication is complete,each strand of the original molecule is bound to a new complementary strand.This process is known as

Correct Answer
verified

Eukaryotic organisms speed up the process of DNA replication by

Correct Answer
verified

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

Correct Answer
verified
C

Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a

Correct Answer
verified

The ends of linear chromosomes that maintain chromosome integrity are called

Correct Answer
verified

Deoxyribose has a carbon atom that is not part of the pentose ring.In a nucleotide,what is attached to this carbon?

Correct Answer
verified
B

The method of DNA replication,where each original strand is used as a template to build a new strand,is called the

Correct Answer
verified

The replisome has two main subcomponents.They are

Correct Answer
verified

If a mutation prevented synthesis of the beta subunit of DNA pol III,which would be most affected?

Correct Answer
verified

If a short sequence of DNA is 5' AATTGCCGT 3',its complement is

Correct Answer
verified

Who proposed that in any DNA molecule,A = T and G = C?

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

Correct Answer
verified

Based on their experiment with T2 bacteriophages,Hershey and Chase concluded that

Correct Answer
verified

I think the proactive stance is a better attitude to promote than after-the-fact worrying! When planning a long week of sunbathing on the beach,What type of DNA damage should sunbathers be aware of before hitting the beach?

Correct Answer
verified

Correct Answer
verified

Exam 14: Dna: the Genetic Material

In DNA,complementary nitrogen bases are held together by

Correct AnswerverifiedShow Answer

In 1952,Hershey and Chase confirmed Avery's (1944) conclusion that

Correct AnswerverifiedShow Answer

You are asked to participate in a clinical trial for a new drug that can activate telomerase.Which of the following is a likely risk of such a drug?

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 most likely cause for this disease?

Correct AnswerverifiedA

________ is the genetic material for all cellular organisms and some viruses.

Correct AnswerverifiedShow Answer

After DNA replication is complete,each strand of the original molecule is bound to a new complementary strand.This process is known as

Correct AnswerverifiedShow Answer

Eukaryotic organisms speed up the process of DNA replication by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a

Correct AnswerverifiedShow Answer

The ends of linear chromosomes that maintain chromosome integrity are called

Correct AnswerverifiedShow Answer

Deoxyribose has a carbon atom that is not part of the pentose ring.In a nucleotide,what is attached to this carbon?

Correct AnswerverifiedB

The method of DNA replication,where each original strand is used as a template to build a new strand,is called the

Correct AnswerverifiedShow Answer

The replisome has two main subcomponents.They are

Correct AnswerverifiedShow Answer

If a mutation prevented synthesis of the beta subunit of DNA pol III,which would be most affected?

Correct AnswerverifiedShow Answer

If a short sequence of DNA is 5' AATTGCCGT 3',its complement is

Correct AnswerverifiedShow Answer

Who proposed that in any DNA molecule,A = T and G = C?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Based on their experiment with T2 bacteriophages,Hershey and Chase concluded that

Correct AnswerverifiedShow Answer

I think the proactive stance is a better attitude to promote than after-the-fact worrying! When planning a long week of sunbathing on the beach,What type of DNA damage should sunbathers be aware of before hitting the beach?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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A

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C

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B

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