Question 1

A gene is 13,066 nucleotides long.This is

Accepted Answer

A)  about 1.3 microbases.
B)  about 1.3 kilobases.
C)  about 1.3 megabases.
D)  about 3,011 amino acids.

Question 2

Next-generation sequencing reads millions of sequences at once,and so the general approach is also called "massively parallel DNA sequencing."

Accepted Answer

A) True 
 B)False

Question 3

In a DNA molecule,the base pairs provide information,and the sugar-phosphate backbone does not,because

Accepted Answer

A)  the base pairs are all the same,but the sugar-phosphate backbone varies.
B)  there are eight types of base pairs.
C)  the bases form a sequence,and the sugar-phosphate backbone does not.
D)  the sugar-phosphate backbone is highly unstable. C

Question 4

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 5

Which of the following statements is true in DNA replication?

Accepted Answer

A)  DNA polymerase unwinds the DNA at replication forks.
B)  Primase removes short RNA primers and replaces them with DNA.
C)  Ligase breaks the hydrogen bonds between complementary DNA strands.
D)  DNA polymerase proofreads DNA,correcting mismatched nucleotides.

Question 6

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)  the hydrogen bonds in DNA differ from hydrogen bonds in other molecules.
C)  the hydrogen bonds in DNA also have a very special type of molecular glue.
D)  ten of them form between each DNA base pair.

Question 7

Meselson and Stahl distinguished between parental and newly-synthesized DNA by using

Accepted Answer

A)  heavy metal.
B)  heavy and light forms of nitrogen.
C)  nucleic acid dyes.
D)  chromosome paints.

Question 8

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.

Question 9

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.

Question 10

Erwin Chargaff showed that DNA that has 30% adenine has _____ thymine.

Accepted Answer

A)  20%
B)  30%
C)  60%
D)  40%

Question 11

Okazaki fragments are small pieces of

Accepted Answer

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

Question 12

Miescher discovered phosphorus in DNA taken from

Accepted Answer

A)  bacteriA.
B)  viruses.
C)  soiled bandages.
D)  dead mice. C

Question 13

In a molecule of DNA,purine bases form _____ bonds with pyrimidine bases.

Accepted Answer

A)  phosphate
B)  hydrogen
C)  disulfide
D)  covalent

Question 14

_____ used models to deduce the double helical shape of DNA.

Accepted Answer

A)  Linus Pauling
B)  James Watson and Francis Crick
C)  Martha Chase
D)  Maclyn McCarty

Question 15

When DNA replication halts in a polymerase chain reaction,owing to the incorporation of a tagged base into a growing DNA chain,a(n) _____ results.

Accepted Answer

A)  partial DNA molecule
B)  template strand
C)  complementary sequence
D)  first-generation DNA molecule

Question 16

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

Accepted Answer

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

Question 17

DNA in the nucleus winds around proteins called

Accepted Answer

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

Question 18

Meselson and Stahl's experiments showed that DNA replication is

Accepted Answer

A)  dispersive,conservative,and semi-conservative.
B)  dispersive,but not conservative or semi-conservative.
C)  semi-conservative,but not dispersive or conservative.
D)  quasi-conservative,but not dispersive or semi-conservative.

Question 19

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. D

Question 20

_____ first noted an acidic substance in the nuclei of cells from pus.

Accepted Answer

A)  Mendel
B)  Watson
C)  Miescher
D)  McCarty

Exam 9: DNA Structure and Replication

A gene is 13,066 nucleotides long.This is

Correct AnswerverifiedShow Answer

Next-generation sequencing reads millions of sequences at once,and so the general approach is also called "massively parallel DNA sequencing."

Correct AnswerverifiedShow Answer

In a DNA molecule,the base pairs provide information,and the sugar-phosphate backbone does not,because

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

Which of the following statements is true in DNA replication?

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

Meselson and Stahl distinguished between parental and newly-synthesized DNA by using

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In DNA replication,

Correct AnswerverifiedShow Answer

Erwin Chargaff showed that DNA that has 30% adenine has _____ thymine.

Correct AnswerverifiedShow Answer

Okazaki fragments are small pieces of

Correct AnswerverifiedShow Answer

Miescher discovered phosphorus in DNA taken from

Correct AnswerverifiedC

In a molecule of DNA,purine bases form _____ bonds with pyrimidine bases.

Correct AnswerverifiedShow Answer

_____ used models to deduce the double helical shape of DNA.

Correct AnswerverifiedShow Answer

When DNA replication halts in a polymerase chain reaction,owing to the incorporation of a tagged base into a growing DNA chain,a(n) _____ results.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

DNA in the nucleus winds around proteins called

Correct AnswerverifiedShow Answer

Meselson and Stahl's experiments showed that DNA replication is

Correct AnswerverifiedShow Answer

Frederick Griffith was a microbiologist who observed that

Correct AnswerverifiedD

_____ first noted an acidic substance in the nuclei of cells from pus.

Correct AnswerverifiedShow Answer

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C

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C

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D

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