HOW DO WE KNOW THAT DNA REPLICATION IS SEMICONSERVATIVE? MESELSON-STAHL EXPERIMENTS

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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Please help me explain this on my report on cell dogma 

HOW DO WE KNOW THAT DNA REPLICATION IS
SEMICONSERVATIVE?
MESELSON-STAHL EXPERIMENTS
15 N cells transferred to4 N medium
Control: E. coli grown for many 1. E. coli grown for many
generations in r N medium.
2. Cells replicate once to
produce first generation
of daughter cells.
3. Cells replicate a second
time to produce a second
generation of daughter cells.
30
generations in 15 N medium.
minutes
Extract DNA from cells.
Extract DNA from cells.
Extract DNA from cells.
Extract DNA from cells.
Centrifuge
Centrifuge
Centrifuge
Centrifuge
DNA bands in cesium chloride gradient
14N 14 N
14N 14 N
15 N 14 N
15N 14 N
15N 15 N
Results confirm prediction of semiconservative replication.
Transcribed Image Text:HOW DO WE KNOW THAT DNA REPLICATION IS SEMICONSERVATIVE? MESELSON-STAHL EXPERIMENTS 15 N cells transferred to4 N medium Control: E. coli grown for many 1. E. coli grown for many generations in r N medium. 2. Cells replicate once to produce first generation of daughter cells. 3. Cells replicate a second time to produce a second generation of daughter cells. 30 generations in 15 N medium. minutes Extract DNA from cells. Extract DNA from cells. Extract DNA from cells. Extract DNA from cells. Centrifuge Centrifuge Centrifuge Centrifuge DNA bands in cesium chloride gradient 14N 14 N 14N 14 N 15 N 14 N 15N 14 N 15N 15 N Results confirm prediction of semiconservative replication.
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