What would the results of Taylor's experiment be if eukaryotes used a conservative mode of DNA replication?
A. After one round of replication in radioactive solution, one double-stranded DNA molecule would be radioactive in both strands and the other would not be radioactive in either strand.
B. After one round of replication in radioactive solution, two double-stranded DNA molecules would be radioactive in one strand and would not be radioactive in the other strand.
C. After one round of replication in radioactive solution, both double-stranded DNA molecules would be radioactive in both strands.
D. After one round of replication in radioactive solution, two double-stranded DNA molecules would contain no radioactivity in any strand.
E. After the second round of replication in nonradioactive solution, all four DNA molecules would be nonradioactive in both strands.
F. After the second round of replication in nonradioactive solution, two of the four DNA molecules would be radioactive in both strands and the other two DNA molecules would contain one radioactive strand and one nonradioactive strand.
G. After the second round of replication in nonradioactive solution, one of the four DNA molecules would be radioactive in both strands and the other three DNA molecules would contain no radioactivity in any strand.
H. After the second round of replication in nonradioactive solution, two of the four DNA molecules would be radioactive in both strands and the other two DNA molecules would be nonradioactive in both strands.

A. After one round of replication in radioactive solution, one double-stranded DNA molecule would be radioactive in both strands and the other would not be radioactive in either strand.

Explanation:

In 1960, Taylor showed that DNA replication in eukaryotic cells is semiconservative. During DNA replication, two DNA molecules are synthesized from the original template. Each one of these DNA molecules contains one strand of the original DNA molecule and one newly-synthesized strand. Taylor used for its experiment plant cells of Vicia faba replicated in the presence of 3H-thymidine. This radioactive isotope (3H-thymidine) releases beta-particles (electrons) and it was used to evidence the semiconservative mechanism by following the distribution of radioactive labeled DNA through a technique known as autoradiography.