Question 1

Which of the following were part of the experiments of Hershey and Chase?

Accepted Answer

A)  Mice were injected with type R bacteria and developed pneumonia.
B)  Mice were injected with type S bacteria and developed pneumonia.
C)  DNA isolated from type S bacteria killed by heating transformed type R bacteria.
D)  E.coli bacteria were infected with virus labeled with radioactive phosphorus.
E)  The researchers made models of the DNA molecule.

Question 2

The "steps" of the DNA double helix spiral staircase are

Accepted Answer

A)   sugars.
B)   hydrogen bonds.
C)   base pairs.
D)   nucleotides.
E)   phosphates.

Question 3

In DNA replication,

Accepted Answer

A)   parental DNA shatters into pieces, and joins with newly-synthesized pieces to fashion two double helices from one.
B)   parental DNA remains intact but guides formation of new double helices.
C)   the parental DNA splits and free nucleotides bond to their complements, building two DNA molecules from one.
D)   an entirely new double helix is built using information in the sequence of amino acids.
E)   DNA taken into the body in the diet enters cells and joins the DNA.

Question 4

The number of DNA replications in an average human lifetime is very approximately

Accepted Answer

A)   one billion.
B)   three trillion.
C)   100 trillion.
D)   100 quadrillion.
E)   infinite.

Question 5

Which base pair is complementary?

Accepted Answer

A)   A and T
B)   C and T
C)   A and G
D)   C and C
E)   G and G A

Question 6

In DNA,cytosine binds with

Accepted Answer

A)   uracil.
B)   adenine.
C)   thymine.
D)   guanine.
E)   amino acids.

Question 7

DNA entwined around an octet of proteins is called a(n)

Accepted Answer

A)   nucleotide.
B)   karyosome.
C)   nucleosome.
D)   ribosome.
E)   octet.

Question 8

Hydrogen bonds are not as strong as ionic or covalent bonds,but they are able to hold the DNA double helix together because

Accepted Answer

A)   there are so many of them.
B)   there are so few of them.
C)   the hydrogen bonds in DNA are different than the hydrogen bonds in other molecules.
D)   the hydrogen bonds in DNA also have a very special type of molecular glue.
E)   ten of them form between each DNA base pair.

Question 9

Frederick Griffith was a microbiologist who observed that

Accepted Answer

A)   DNA contains nitrogen and phosphorus.
B)   proteases disrupt transformation from nonvirulence to virulence.
C)   DNA from heat-killed viruses transforms virulent viruses.
D)   nonvirulent bacteria become virulent when mixed with heat-killed virulent bacteria.
E)   the X-ray diffraction pattern of DNA is highly symmetrical.

Question 10

In experiments to show that DNA is the genetic material,Hershey and Chase labeled DNA with radioactive

Accepted Answer

A)   amino acids.
B)   sulfur.
C)   phosphorus.
D)   carbon.
E)   nitrogen. C

Question 11

Because DNA strands are antiparallel,replication proceeds

Accepted Answer

A)   continuously on both strands.
B)   continuously on one strand and discontinuously on the other.
C)   discontinuously on both strands.
D)   continuously on both strands for a time and then discontinuously.
E)   discontinuously using amino acids.

Question 12

DNA in the nucleus winds around proteins called

Accepted Answer

A)   histones.
B)   herstones.
C)   karyosomes.
D)   ribosomes.
E)   proteasomes.

Question 13

Okazaki fragments are small pieces of

Accepted Answer

A)   RNA.
B)   protein.
C)   DNA.
D)   enzymes.
E)   sushi.

Question 14

Hershey and Chase demonstrated that DNA was the genetic material using

Accepted Answer

A)   poodles in microwave ovens.
B)   hamsters and a blender.
C)   frogs and a dishwasher.
D)   viruses and a blender.
E)   X-rays and models. D

Question 15

Chromatin consists of about

Accepted Answer

A)   10% histones, 30% DNA binding proteins, 30% DNA, and 30% RNA.
B)   25% histones, 25% DNA binding proteins, 25% DNA, and 25% RNA.
C)   30% histones, 30% DNA binding proteins, 30% DNA, and 10% RNA.
D)   10% histones, 10% DNA binding proteins, 70% DNA, and 10% RNA.
E)   90% DNA and 20% proteins.

Question 16

In one minute,DNA replicates about _______ bases.

Accepted Answer

A)   40
B)   100
C)   250
D)   1,000
E)   3,000

Question 17

The enzyme that inserts the correct bases in a growing nucleotide chain in a replicating DNA molecule is

Accepted Answer

A)   RNA polymerase.
B)   DNA ligase.
C)   DNA polymerase.
D)   helicase.
E)   RNA ligase.

Question 18

Purines and pyrimidines refer to the ______ of the DNA molecules.

Accepted Answer

A)   nitrogenous bases
B)   sugar-phosphate backbone
C)   hydrogen bonds
D)   nucleus
E)   histones

Question 19

Meselson and Stahl's experiment followed

Accepted Answer

A)   the distribution of different-weighted DNA over three generations of bacteria.
B)   the distribution of different-labeled DNA over three generations of humans.
C)   the ability of a protease or nuclease to stop the transmission of DNA over generations.
D)   viruses injecting their DNA into bacteria.
E)   DNA sequences in people who are politically liberal compared to those who are sometimes politically conservative.

Question 20

The nitrogenous bases adenine and thymine are

Accepted Answer

A)   both purines.
B)   both pyrimidines.
C)   both amino acids.
D)   a purine and a pyrimidine, respectively.
E)   a pyrimidine and a purine, respectively.

Exam 9: DNA Structure and Replication

Which of the following were part of the experiments of Hershey and Chase?

Correct AnswerverifiedShow Answer

The "steps" of the DNA double helix spiral staircase are

Correct AnswerverifiedShow Answer

In DNA replication,

Correct AnswerverifiedShow Answer

The number of DNA replications in an average human lifetime is very approximately

Correct AnswerverifiedShow Answer

Which base pair is complementary?

Correct AnswerverifiedA

In DNA,cytosine binds with

Correct AnswerverifiedShow Answer

DNA entwined around an octet of proteins is called a(n)

Correct AnswerverifiedShow Answer

Hydrogen bonds are not as strong as ionic or covalent bonds,but they are able to hold the DNA double helix together because

Correct AnswerverifiedShow Answer

Frederick Griffith was a microbiologist who observed that

Correct AnswerverifiedShow Answer

In experiments to show that DNA is the genetic material,Hershey and Chase labeled DNA with radioactive

Correct AnswerverifiedC

Because DNA strands are antiparallel,replication proceeds

Correct AnswerverifiedShow Answer

DNA in the nucleus winds around proteins called

Correct AnswerverifiedShow Answer

Okazaki fragments are small pieces of

Correct AnswerverifiedShow Answer

Hershey and Chase demonstrated that DNA was the genetic material using

Correct AnswerverifiedD

Chromatin consists of about

Correct AnswerverifiedShow Answer

In one minute,DNA replicates about _______ bases.

Correct AnswerverifiedShow Answer

The enzyme that inserts the correct bases in a growing nucleotide chain in a replicating DNA molecule is

Correct AnswerverifiedShow Answer

Purines and pyrimidines refer to the ______ of the DNA molecules.

Correct AnswerverifiedShow Answer

Meselson and Stahl's experiment followed

Correct AnswerverifiedShow Answer

The nitrogenous bases adenine and thymine are

Correct AnswerverifiedShow Answer

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C

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D

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