In the Meselson-Stahl experiment, 15N-labeled cells were shifted to 14N medium a
ID: 166521 • Letter: I
Question
In the Meselson-Stahl experiment, 15N-labeled cells were shifted to 14N medium at what is designated as generation 0. For the conservative model of replication, what proportion of 15N-15N, 15N- 14N, and 14N-14N would you expect to find after one replication cycle?
15N-15N
15N-14N
14N-14N
25%
12.5%
75%
100%
50%
87.5%
0%
- A. B. C. D. E. F. G.15N-15N
- A. B. C. D. E. F. G.15N-14N
- A. B. C. D. E. F. G.14N-14N
A.25%
B.12.5%
C.75%
D.100%
E.50%
F.87.5%
G.0%
Explanation / Answer
In meselson and stahl experiment when 15N DNA was shifted to 14N medium amd allowed to replicate. After 1 replication cycle it produced 2 DNA strands per DNA strand introduced in the medium. All of the DNA relicated semiconservatively to produce 100 % 15N - 14N DNA .
so 0% 15N 15N and 0% 14N 14N.