In the Meselson-Stahl experiment, 15N-labeled cells were shifted to 14N medium a

Question

In the Meselson-Stahl experiment, 15N-labeled cells were shifted to 14N medium at what is designated as generation 0. In subsequent divisions DNA molecules can result that are N15-N15, N15-N14 or N14-N14.

A) For the conservative model of replication, what proportion of 14N-14N would you expect to find after three replication cycle?

B)  For the conservative model of replication, what proportion of 14N-14N would you expect to find after one replication cycle?

C) For the semi-conservative model of replication, what proportion of 14N-14N would you expect to find after one replication cycle?

D) For the semi-conservative model of replication, what proportion of 14N-14N would you expect to find after three replication cycle?

a.0%

b.12.5%

c.50%

d.87.5%

e.100%

f. 25%

g. 75%

Explanation / Answer

A) c

B) b

C) f

D) e

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