In the Meselson-Stahl experiment, 15N-labeled cells were shifted to 14N medium a
ID: 166474 • 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 three replication cycles?
15N-15N
15N-14N
14N-14N
25%
50%
0%
87.5%
100%
75%
12.5%
- 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.50%
C.0%
D.87.5%
E.100%
F.75%
G.12.5%
Explanation / Answer
In meselson stahl experiment when 15N 15N DNA was shifted to 14N medium and after 3 cycles of replication, each strand DNA produced 8 strands of DNA semiconservatively. Out of which, 25 % were 15N - 14N and 75% were 14N - 14N.
No DNA with 15N - 15N was found