DNA is said to replicate in a semi-conservative way.
Results of Meselson and Stahl’s experiments gave overwhelming support to this theory. They
used E. coli which has a generation time of 50 minutes.
Here are the steps in their experiment but they are in the wrong order.
P- All bacteria contain ${}^{15}N$ DNA.
Q- All bacteria contain hybrid DNA (${}^{15}N$ DNA and ${}^{14}N$ DNA).
R- Bacteria contain either all ${}^{14}N$ DNA or hybrid DNA.
S- Bacteria grown in a ${}^{15}N$ medium for many generations.
T- Bacteria transferred to a ${}^{14}N$ medium and sampled every 50 minutes.
Which sequence of letters shows the correct order of the steps in the experiment?
1 )
P → Q → R → S → T
2 )
P → S → T → R → Q
S → P → T → Q → R
4 )
S → R → Q → P → T
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