If a cell at G1 contains four picograms of DNA, how many picograms of DNA will it contain at the end of the S phase of the cell cycle? a. 0; b. 2; c. 4; d. 8

Video transcript

Hi all. Let's look at our next question. What happens with the amount of D. N. A. During the interface? Well let's think back to our content videos and to remember what is the interface. What's going on there with our D. N. A. And I'm just gonna put up this quick little illustration to remind us um the phases of the cell cycle. I've shaded out the M. The mitosis because then the remainder these three parts constitute the interface when the cell is not actively dividing. So we've got G. One and G. Two our growth phase and then growth and for preparation for division. But this s standing for synthesis is when the D. N. A. Is being copied and during that synthesis phase the D. N. A. Is duplicated. So the cell will have two copies of those chromosomes in preparation for its splitting into two daughter cells during mitosis. So we're going to go ahead and highlight duplicated which is Choice B. Here. And we can look at our other answers and see A. Says it doesn't change. Obviously that's not correct. See triplicate ID. No just two copies D. All the above. Obviously not our answer. So again during the interphase. So when mitosis is not occurring that D. N. A. Is duplicated during that s. Phase to prepare for the cell division of mitosis. So choice be our answer. See you in the next video