Be sure to answer all parts. imagine conducting the meselson and stahl experiment on dna that is replicated by the dispersive mechanism. after 3 rounds of replication, what percentage of the dna would contain exclusively 15n, exclusively 14n, or a mix of 14n and 15n?

25% mixture of N15 and N14 and 75% of exclusively N14.

Explanation:

In the Meselson and Stahl experiment a double DNA chain formed by N15 is placed in a medium with only N14. Therefore, when replicated, the new chains will be synthesized with N14 (lighter). This can be corroborated by centrifuging the sample.

Before replication, a single band corresponding to the double helix of N15 DNA is observed.

After a single replication, only one band corresponding to DNA is observed with 1 strand N15 and 1 strand N14.

After the second replication, two bands will be observed. One for DNA of 1 strand N15 and 1 strand N14 and the other for DNA of 2 strands N14.

The same will happen for the third replication. At this point, the DNA present will consist of a 25% mixture of N15 and N14 and 75% of exclusively N14.

This experiment proves that DNA replication is semi-conservative.

i think that you are smart and you should fit for it out

the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.