CAMPBELL BIOLOGY CHAPTER 16-
20 TEST BANK QUESTIONS AND
CORRECT ANSWERS GUARANTEED
SUCCESS!!!
In his transformation experiments, what did Griffith observe? A) Mutant mice were
resistant to bacterial infections.
B) Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain
can convert some of the living cells into the pathogenic form.
C) Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain
makes the pathogenic strain nonpathogenic.
D) Infecting mice with nonpathogenic strains of bacteria makes them resistant to
pathogenic strains.
E) Mice infected with a pathogenic strain of bacteria can spread the infection to other
mice. ANSWER- B) Mixing a heat-killed pathogenic strain of bacteria with a living
nonpathogenic strain can convert some of the living cells into the pathogenic form.
How do we describe transformation in bacteria?
A) the creation of a strand of DNA from an RNA molecule
B) the creation of a strand of RNA from a DNA molecule
,C) the infection of cells by a phage DNA molecule
D) the type of semiconservative replication shown by DNA
E) assimilation of external DNA into a cell ANSWER- E) assimilation of external DNA into
a cell
After mixing a heat-killed, phosphorescent strain of bacteria with a living
nonphosphorescent strain, you discover that some of the living cells are now
phosphorescent. Which observations would provide the best evidence that the ability to
fluoresce is a heritable trait?
A) DNA passed from the heat-killed strain to the living strain.
B) Protein passed from the heat-killed strain to the living strain. C) The phosphorescence
in the living strain is especially bright.
D) Descendants of the living cells are also phosphorescent.
E) Both DNA and protein passed from the heat-killed strain to the living strain. ANSWER-
D) Descendants of the living cells are also phosphorescent.
In trying to determine whether DNA or protein is the genetic material, Hershey and
Chase made use of which of the following facts? A) DNA contains sulfur, whereas protein
does not.
B) DNA contains phosphorus, whereas protein does not.
C) DNA contains nitrogen, whereas protein does not.
D) DNA contains purines, whereas protein includes pyrimidines.
E) RNA includes ribose, whereas DNA includes deoxyribose sugars. ANSWER- B) DNA
contains phosphorus, whereas protein does not.
,Which of the following investigators was/were responsible for the following discovery?
In DNA from any species, the amount of adenine equals the amount of thymine, and the
amount of guanine equals the amount of cytosine.
A) Frederick Griffith
B) Alfred Hershey and Martha Chase
C) Oswald Avery, Maclyn McCarty, and Colin MacLeod
D) Erwin Chargaff
E) Matthew Meselson and Franklin Stahl ANSWER- D) Erwin Chargaff
Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism.
Approximately what percentage of the nucleotides in this sample will be thymine?
A) 8%
B) 16%
C) 31%
D) 42%
E) It cannot be determined from the information provided. ANSWER-
A) 8%
Which of the following can be determined directly from X-ray diffraction photographs of
crystallized DNA?
A) the diameter of the helix
B) the rate of replication
C) the sequence of nucleotides
D) the bond angles of the subunits
, E) the frequency of A vs. T nucleotides ANSWER- A) the diameter of the helix
It became apparent to Watson and Crick after completion of their model that the DNA
molecule could carry a vast amount of hereditary information in which of the following?
A) sequence of bases
B) phosphate-sugar backbones
C) complementary pairing of bases
D) side groups of nitrogenous bases
E) different five-carbon sugars ANSWER- A) sequence of bases
In an analysis of the nucleotide composition of DNA, which of the following will be
found? A) A = C
B) A = G and C = T
C) A + C = G + T
D) G + C = T + A ANSWER- C) A + C = G + T
Replication in prokaryotes differs from replication in eukaryotes for which of the following
reasons?
A) Prokaryotic chromosomes have histones, whereas eukaryotic chromosomes do not.
B) Prokaryotic chromosomes have a single origin of replication, whereas eukaryotic
chromosomes have many.
C) The rate of elongation during DNA replication is slower in prokaryotes than in
eukaryotes.
20 TEST BANK QUESTIONS AND
CORRECT ANSWERS GUARANTEED
SUCCESS!!!
In his transformation experiments, what did Griffith observe? A) Mutant mice were
resistant to bacterial infections.
B) Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain
can convert some of the living cells into the pathogenic form.
C) Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain
makes the pathogenic strain nonpathogenic.
D) Infecting mice with nonpathogenic strains of bacteria makes them resistant to
pathogenic strains.
E) Mice infected with a pathogenic strain of bacteria can spread the infection to other
mice. ANSWER- B) Mixing a heat-killed pathogenic strain of bacteria with a living
nonpathogenic strain can convert some of the living cells into the pathogenic form.
How do we describe transformation in bacteria?
A) the creation of a strand of DNA from an RNA molecule
B) the creation of a strand of RNA from a DNA molecule
,C) the infection of cells by a phage DNA molecule
D) the type of semiconservative replication shown by DNA
E) assimilation of external DNA into a cell ANSWER- E) assimilation of external DNA into
a cell
After mixing a heat-killed, phosphorescent strain of bacteria with a living
nonphosphorescent strain, you discover that some of the living cells are now
phosphorescent. Which observations would provide the best evidence that the ability to
fluoresce is a heritable trait?
A) DNA passed from the heat-killed strain to the living strain.
B) Protein passed from the heat-killed strain to the living strain. C) The phosphorescence
in the living strain is especially bright.
D) Descendants of the living cells are also phosphorescent.
E) Both DNA and protein passed from the heat-killed strain to the living strain. ANSWER-
D) Descendants of the living cells are also phosphorescent.
In trying to determine whether DNA or protein is the genetic material, Hershey and
Chase made use of which of the following facts? A) DNA contains sulfur, whereas protein
does not.
B) DNA contains phosphorus, whereas protein does not.
C) DNA contains nitrogen, whereas protein does not.
D) DNA contains purines, whereas protein includes pyrimidines.
E) RNA includes ribose, whereas DNA includes deoxyribose sugars. ANSWER- B) DNA
contains phosphorus, whereas protein does not.
,Which of the following investigators was/were responsible for the following discovery?
In DNA from any species, the amount of adenine equals the amount of thymine, and the
amount of guanine equals the amount of cytosine.
A) Frederick Griffith
B) Alfred Hershey and Martha Chase
C) Oswald Avery, Maclyn McCarty, and Colin MacLeod
D) Erwin Chargaff
E) Matthew Meselson and Franklin Stahl ANSWER- D) Erwin Chargaff
Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism.
Approximately what percentage of the nucleotides in this sample will be thymine?
A) 8%
B) 16%
C) 31%
D) 42%
E) It cannot be determined from the information provided. ANSWER-
A) 8%
Which of the following can be determined directly from X-ray diffraction photographs of
crystallized DNA?
A) the diameter of the helix
B) the rate of replication
C) the sequence of nucleotides
D) the bond angles of the subunits
, E) the frequency of A vs. T nucleotides ANSWER- A) the diameter of the helix
It became apparent to Watson and Crick after completion of their model that the DNA
molecule could carry a vast amount of hereditary information in which of the following?
A) sequence of bases
B) phosphate-sugar backbones
C) complementary pairing of bases
D) side groups of nitrogenous bases
E) different five-carbon sugars ANSWER- A) sequence of bases
In an analysis of the nucleotide composition of DNA, which of the following will be
found? A) A = C
B) A = G and C = T
C) A + C = G + T
D) G + C = T + A ANSWER- C) A + C = G + T
Replication in prokaryotes differs from replication in eukaryotes for which of the following
reasons?
A) Prokaryotic chromosomes have histones, whereas eukaryotic chromosomes do not.
B) Prokaryotic chromosomes have a single origin of replication, whereas eukaryotic
chromosomes have many.
C) The rate of elongation during DNA replication is slower in prokaryotes than in
eukaryotes.
