After one round of DNA replication, <u>none</u> of the DNA will contain only 14N, <u>none</u> of the DNA will contain only 15N, and <u>all</u> of the DNA will be of an intermediate density.
Explanation:
In order to rule out the conservative model of DNA replication and discover that it in fact a semi-conservative model, this technique was employed to check for what ratio of N15 and N14 was present in cells that had undergone the process of replication. The former would've resulted in equal densities of both N14 and N15.
negative feedback loop involving insulin and glucagon help to keep blood glucose levels within a narrow concentration range. If glucose levels get too high, the body releases insulin into the bloodstream.
