00:01
Okay, this question here says, suppose you're provided with an actively dividing culture of e.
00:06
Coli bacteria to which radioactive timing has been added.
00:10
What would happen if a cell replicates once in the presence of this radioactive base? so in this case, just imagine this is your parental dna strand without radioactive timing, okay? and once dna replication occurs, your two daughter strands or your two parental strands are going to be separated.
00:29
This is one parental strand and this is another parental strand.
00:32
And you're going to develop dna replication.
00:35
Remember that one, or well, this is going to be the future dna molecule and this is another future dna molecule or double -stranded dna molecule.
00:43
So from one parental strand, you're going to produce, de novo, a daughter strand.
00:48
And this daughter strand is going to contain the radioactive timing bases.
00:53
So you're going to have your daughter strand with radioactive timing bases, okay? you're not going to add anything here because this dna strand is already produced, okay? but once you synthesize this dna molecule, you're going to have your radioactive timing bases.
01:11
And the same for this daughter strand here.
01:13
So basically, both daughter strands, okay, both double -stranded daughter strands or dna molecules are going to have the radioactive timing.
01:23
So in this case, the answer is going to be dna in both daughter cells will be radioactive.
01:29
This is the answer for this question, okay? option a is false because you're not going to have the four bases of the dna are not going to be radioactive, only the timing.
01:41
And it says neither of the two daughter cells would be radioactive.
01:43
This is false.
01:44
In one of the daughter cells, but not the other, would have radioactive dna.
01:48
This is false because both of them are going to have the radioactive dna.
01:53
Then it says, based on the figure below, leading a strand replication at which locations.
02:00
So first let's label the ends.
02:02
So you have here the three ends.
02:03
So you have here the five ends...