Student Center
|
Instructor Center
|
Information Center
|
Home
Web Links
Lecture PowerPoints
Image PowerPoints
Choose a Chapter
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18
Chapter 19
Chapter 20
Chapter 21
Chapter 22
Chapter 23
Chapter 24
Action of DNA Gyrase
Bidirectional DNA Replication
Direct Repair
DNA Replication (E. coli)
DNA Replication Fork
How Nucleotides Ar...
Meselson and Stahl Experiment
Methyl-directed Mi...
Nucleotide Excision Repair
Proofreading Funct...
Rolling Circle Mec...
Thymine Dimers For...
Feedback
Help Center
Molecular Biology, 4/e
Robert F. Weaver
DNA Replication I: Basic Mechanism and Enzymology
Meselson and Stahl Experiment
View the animation below, then complete the quiz to test your knowledge of the concept.
1
The Meselson-Stahl experiment demonstrated that DNA replication produces two DNA molecules each composed of
A)
two old strands.
B)
two new strands.
C)
one old and one new strand.
D)
two strands with variable proportions of new and old DNA.
E)
a variable number of old and new strands.
2
Starting with
15
N
15
N (heavy) DNA, and after TWO generations in the
14
N medium,
Escherichia coli
cells will contain
A)
25%
15
N
15
N DNA, 50%
15
N
14
N DNA, and 25%
14
N
14
N DNA.
B)
50%
15
N
15
N DNA and 50%
14
N
14
N DNA.
C)
50%
15
N
15
N DNA and 50%
15
N
14
N DNA.
D)
50%
15
N
14
N DNA and 50%
14
N
14
N DNA.
E)
25%
15
N
14
N DNA and 75%
14
N
14
N DNA.
3
Starting with
15
N
15
N (heavy) DNA, and after THREE generations in the
14
N medium,
E. coli
cells will produce the following band(s) in density-gradient centrifugation:
A)
a single band of DNA with medium density.
B)
one band of light DNA and one band of DNA with medium density.
C)
one band of heavy DNA and one band of DNA with medium density.
D)
one band of heavy DNA and one band of light DNA.
E)
three bands corresponding to DNA of light, medium and heavy density.
4
Meselson and Stahl performed the density-gradient centrifugation of DNA in a solution of calcium chloride.
A)
True
B)
False
5
Starting with
15
N
15
N (heavy) DNA, and after ONE generation in the
14
N medium,
E. coli
cells subjected to density-gradient centrifugation will produce a single band of DNA with medium density.
A)
True
B)
False
2008 McGraw-Hill Higher Education
Any use is subject to the
Terms of Use
and
Privacy Policy
.
McGraw-Hill Higher Education
is one of the many fine businesses of
The McGraw-Hill Companies
.