Answer:
conservative replication model
Explanation:
In their experiment, Meselson and Stahl found that the DNA duplexes present after the first round of replication had intermediate density. This occurred since the semiconservative process of DNA replication of one DNA molecule (having both strands with 15N) forms two DNA duplexes each with one parental strand (15N) and one newly formed strand (14N).
If they had found two duplexes of two different density, this would have supported the conservative replication model. In this case, the DNA replication of the parent DNA molecule would have formed two DNA duplexes. One DNA molecule would have both the parental DNA strands with 15N while the other DNA duplex would have both newly formed strands with 14N.
It is important to know chemistry first because you need to know what might happen or is happening if you do an experiment in biology. An example would be that my class just did an experiment with yeast and we needed to know about CO2 and how it was working and everything else. Hope this helps.
The type of method of neuroimaging that the doctor should
use in detecting a possible tumor that he thinks Samantha has is the MRI or
also known as the Magnetic Resonance Imaging. This is scan that will help in
recognizing a tumor in a person’s body.