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WorksheetsDiscoveries of the DNA molecule
Total questions: 9
Worksheet time: 9mins
Name
Class
Date
1.
In his transformation experiments, what did Griffith observe?
a)
Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form.
b)
Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the pathogenic strain nonpathogenic.
c)
Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic strains.
d)
Mice infected with a pathogenic strain of bacteria can spread the infection to other mice.
2.
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)
assimilation of external DNA into a cell
3.
After mixing a heat-killed, phosphorescent (light-emitting) strain of bacteria with a living, nonphosphorescent strain, you discover that some of the living cells are now phosphorescent. Which observation(s) would provide the best evidence that the ability to phosphoresce is a heritable trait?
a)
evidence that DNA was passed from the heat-killed strain to the living strain
b)
evidence that protein passed from the heat-killed strain to the living strain
c)
especially bright phosphorescence in the living strain
d)
phosphorescence in descendants of the living cells
4.
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
5.
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)
Alfred Hershey and Martha Chase
b)
Oswald Avery, Maclyn McCarty, and Colin MacLeod
c)
Erwin Chargaff
d)
Matthew Meselson and Franklin Stahl
6.
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)
42%
d)
58%
7.
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
8.
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
9.
Hershey and Chase set out to determine what molecule served as the unit of inheritance. They completed a series of experiments in which E. coli was infected by a T2 virus. Which molecular component of the T2 virus actually ended up inside the cell?
a)
protein
b)
RNA
c)
ribosome
d)
DNA
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