00:01
Asking us about checkpoints.
00:04
And so we'll start there.
00:05
Checkpoints are times in the cell cycle when the cell pauses and makes an assessment of itself.
00:19
So the cell assesses whether it's ready to move on to the next stage of the cycle.
00:26
So the cell assesses its readiness to move on to the next stage of the cell cycle.
00:35
Cycle.
00:48
And what constitutes being ready depends on which of the checkpoints.
00:54
So there are three main checkpoints.
00:56
There is the g1 s checkpoint, g1s checkpoint, gap 1s checkpoint.
01:03
And this occurs at the end of gap one and start of the synthesis phase of the cell cycle.
01:09
And basically the cell is checking whether or not all the enzymes and proteins and nucleotides.
01:18
Are ready for the synthesis phase to continue or to begin.
01:28
Because if they're not ready, then the cell shouldn't move forward and start the synthesis phase.
01:33
So it's basically asking whether all the enzymes and proteins are ready.
01:39
There's also the gap two mitotic phase, that point...