
Meselson and Stahl
Authored by Amanda Miller
Biology
11th Grade - University
Used 86+ times

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4 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The Meselson-Stahl experiment demonstrated that DNA replication produces two DNA molecules each composed of
Two old strands
Two new strands
One old strand and one new strand
two strands with variable proportions of new and old DNA.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Starting with 15N15N (heavy) DNA, and after TWO generations in the 14N medium, Escherichia coli cells will contain
25% 15N15N DNA, 50% 15N14N DNA, and 25% 14N14N DNA.
50% 15N15N DNA and 50% 14N14N DNA.
50% 15N15N DNA and 50% 15N14N DNA.
50% 15N14N DNA and 50% 14N14N DNA.
25% 15N14N DNA and 75% 14N14N DNA.
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Starting with 15N15N (heavy) DNA, and after THREE generations in the 14N medium, E. coli cells will produce the following band(s) in density-gradient centrifugation:
a single band of DNA with medium density.
one band of light DNA and one band of DNA with medium density.
one band of heavy DNA and one band of DNA with medium density.
one band of heavy DNA and one band of light DNA.
three bands corresponding to DNA of light, medium and heavy density.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Meselson and Stahl performed the density-gradient centrifugation of DNA in a solution of calcium chloride.
True
False
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