Question 1

Chargaff showed that DNA that has 30% adenine has ___ cytosine.

Accepted Answer

A)  20% 
B)  30% 
C)  60% 
D)  40% 
E)  a percentage that cannot be determined of 
A)  20% 
B)  30% 
C)  60% 
D)  40% 
E)  a percentage that cannot be determined of

Question 2

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. 
E)  discontinuous and not continuous. 
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. 
E)  discontinuous and not continuous.

Question 3

Which statement is correct?

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. 
E)  Replication forks form as the sugar phosphate backbone is sealed. 
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. 
E)  Replication forks form as the sugar phosphate backbone is sealed.

Question 4

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

Accepted Answer

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

Question 5

Which researchers showed that DNA is the genetic material?

Accepted Answer

A)  Watson and Crick 
B)  Hershey and Chase 
C)  Garrod and Griffith 
D)  Meselson and Stahl 
E)  Lennon and McCartney 
A)  Watson and Crick 
B)  Hershey and Chase 
C)  Garrod and Griffith 
D)  Meselson and Stahl 
E)  Lennon and McCartney

Question 6

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. 
E)  about 40,000 DNA bases long. 
A)  about 1.3 microbases. 
B)  about 1.3 kilobases. 
C)  about 1.3 megabases. 
D)  about 3,011 amino acids. 
E)  about 40,000 DNA bases long.

Question 7

A scientist discovers a virus whose genome consists of an unusual DNA strand from a virus.She finds the following percentage of bases: 23% A,12% T,30% G,and 35% C.Which of the following best explains these results?

Accepted Answer

A) The bases are not purines or pyrimidines. 
B) Chargaff was wrong. 
C) Linus Pauling's model of DNA was correct. 
D) The DNA in this virus is single-stranded. 
E) The experiment was contaminated with cockroach DNA. 
A) The bases are not purines or pyrimidines. 
B) Chargaff was wrong. 
C) Linus Pauling's model of DNA was correct. 
D) The DNA in this virus is single-stranded. 
E) The experiment was contaminated with cockroach DNA.

Question 8

_______ incorrectly suggested DNA has a triple helix structure.

Accepted Answer

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

Question 9

The DNA researcher who had his genome sequenced is

Accepted Answer

A)  Francis Crick. 
B)  James Watson. 
C)  Frederick Griffith. 
D)  Rosalind Franklin. 
E)  Jay Leno. 
A)  Francis Crick. 
B)  James Watson. 
C)  Frederick Griffith. 
D)  Rosalind Franklin. 
E)  Jay Leno.

Question 10

Which chemical is not part of DNA?

Accepted Answer

A)  phosphate 
B)  ribose 
C)  cytosine 
D)  nitrogen 
E)  carbon 
A)  phosphate 
B)  ribose 
C)  cytosine 
D)  nitrogen 
E)  carbon

Question 11

In 1909,Archibald Garrod linked inheritance to proteins when he noted that

Accepted Answer

A)  inherited metabolic disorders in humans are associated with missing enzymes. 
B)  substances in cells could transform bacteria from nonvirulence to virulence. 
C)  proteins are made up of amino acids. 
D)  the substance that transmits traits is in the cell nucleus. 
E)  X-ray diffraction reveals that DNA is a highly symmetrical molecule. 
A)  inherited metabolic disorders in humans are associated with missing enzymes. 
B)  substances in cells could transform bacteria from nonvirulence to virulence. 
C)  proteins are made up of amino acids. 
D)  the substance that transmits traits is in the cell nucleus. 
E)  X-ray diffraction reveals that DNA is a highly symmetrical molecule.

Question 12

_______ used X-ray diffraction to deduce the helical shape of DNA.

Accepted Answer

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

Question 13

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

Question 14

Avery,MacLeod and McCarty's experiments built on the results of the experiments of

Accepted Answer

A)  Gregor Mendel. 
B)  Frederick Griffith. 
C)  Alfred Hershey and Martha Chase. 
D)  Erwin Chargaff and Phoebus Levene. 
E)  Rosalind Franklin. 
A)  Gregor Mendel. 
B)  Frederick Griffith. 
C)  Alfred Hershey and Martha Chase. 
D)  Erwin Chargaff and Phoebus Levene. 
E)  Rosalind Franklin.

Question 15

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

Accepted Answer

A)  20% 
B)  30% 
C)  60% 
D)  40% 
E)  a percentage that cannot be determined of 
A)  20% 
B)  30% 
C)  60% 
D)  40% 
E)  a percentage that cannot be determined of

Question 16

Rosalind Franklin did not share in the Nobel Prize for determining the structure of DNA,although her work was critical to it,because

Accepted Answer

A)  she was a she. 
B)  the prize can only be awarded to three people. 
C)  she had died, and it is only awarded to living people. 
D)  she turned it down. 
E)  she was not a full professor. 
A)  she was a she. 
B)  the prize can only be awarded to three people. 
C)  she had died, and it is only awarded to living people. 
D)  she turned it down. 
E)  she was not a full professor.

Question 17

When DNA folds and winds into the nucleus of a cell,it shrinks in length by a factor of

Accepted Answer

A)  10. 
B)  100. 
C)  1,000. 
D)  7,000. 
E)  3.2 billion. 
A)  10. 
B)  100. 
C)  1,000. 
D)  7,000. 
E)  3.2 billion.

Question 18

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

Accepted Answer

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

Question 19

If the sequence of one strand of a DNA molecule is 5' ATGGCAT 3',the sequence of the complementary strand is:

Accepted Answer

A)  5' ATGGCAT 3' 
B)  3' ATGGCAT 5' 
C)  5' TACCGTA 3' 
D)  3' TACCGTA 5' 
E)  3' AUGGCAU 5' 
A)  5' ATGGCAT 3' 
B)  3' ATGGCAT 5' 
C)  5' TACCGTA 3' 
D)  3' TACCGTA 5' 
E)  3' AUGGCAU 5'

Question 20

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)  green fluorescent protein from jellyfish. 
D)  nucleic acid dyes. 
E)  chromosome paints. 
A)  heavy metal. 
B)  heavy and light forms of nitrogen. 
C)  green fluorescent protein from jellyfish. 
D)  nucleic acid dyes. 
E)  chromosome paints.

Exam 9: DNA Structure and Replication

Chargaff showed that DNA that has 30% adenine has ___ cytosine.

Meselson and Stahl's experiments showed that DNA replication is

Which statement is correct?

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

Which researchers showed that DNA is the genetic material?

A gene is 13,066 nucleotides long.This is

A scientist discovers a virus whose genome consists of an unusual DNA strand from a virus.She finds the following percentage of bases: 23% A,12% T,30% G,and 35% C.Which of the following best explains these results?

_______ incorrectly suggested DNA has a triple helix structure.

The DNA researcher who had his genome sequenced is

Which chemical is not part of DNA?

In 1909,Archibald Garrod linked inheritance to proteins when he noted that

_______ used X-ray diffraction to deduce the helical shape of DNA.

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

Avery,MacLeod and McCarty's experiments built on the results of the experiments of

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

Rosalind Franklin did not share in the Nobel Prize for determining the structure of DNA,although her work was critical to it,because

When DNA folds and winds into the nucleus of a cell,it shrinks in length by a factor of

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

If the sequence of one strand of a DNA molecule is 5' ATGGCAT 3',the sequence of the complementary strand is:

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

Overview of Genetics

Cells

Meiosis and Development

Single-Gene Inheritance

Beyond Mendels Law

Matters of Sex

Multifactorial Traits

Genetics of Behavior

Gene Action: From Dna to Protein

Gene Expression and Epigenetics

Gene Mutation

Chromosomes

Constant Allele Frequencies

Changing Allele Frequencies

Human Ancestry

Genetics of Immunity

Genetics of Cancer

Genetic Technologies: Amplifying, Modifying, and Monitoring DNA

Genetic Testing and Treatment

Reproductive Technologies

Genomics

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