00:01
The phase of the bacterial growth curve in which the rate of cell division equals the rate of cell death is lag phase, log phase, death phase, telophase, or stationary phase.
00:13
So i'll start by drawing a graph of bacterial growth.
00:18
So of course, we'll have a time along the x -axis and population size on the y, and we start out with a very small population.
00:27
Initially, growth is very slow.
00:29
Then at some point it becomes exponential.
00:34
So very slow and then exponential.
00:38
At some point it then reaches a cap and then it drops off.
00:43
So what are these phases? well we can see a clear phase here where it's very slow, a clear phase where it's exponential, clear phase where it's zero and then where it's negative.
00:57
So these in order are called lag phase, log or exponential.
01:02
Stationary, and death.
01:05
Telophase is not one of these.
01:07
Telophase is a phase of mitosis, or meiosis, but not of bacterial growth.
01:15
Okay, so lag phase, the growth rate is very low, because the bacteria are still adjusting to their new environment.
01:24
So it's a phase of adjusting.
01:26
And if we look at the rate of cell division and the rate of cell death, well, cell division is going to be slightly higher than cell death because growth is happening.
01:35
If you imagine the change in n is going to be equal to births minus deaths...