00:01
So in the meselson and starr experiment, it investigated the mechanism of dna replication.
00:09
The bacteria cell are born in a heavy n15 medium for several generations and then switch to light n14 media.
00:17
Now describe the result expected after one round of replication in light media if the dna replication mechanism were conservative.
00:29
Now we know that the real dna replication model is semi -conservative which means when you have a new dna double strand, one old is one new.
00:40
Now if you have a conservative model, so this means that when you have dna replication, the two old dna will stay together and the two new strands will stay together.
01:00
So let's say you have a double -stranded dna, both are labeled with n15.
01:05
Now according to the conservative model, after one round of replication in n14 media, let's use red color to show n14, the two old strands will stay together and then you have a new strand, double -stranded dna, both are made of n14.
01:33
So this is called the conservative model...